langref.org - ruby, cpp, fsharp, and erlang

All Problems

Strings

Printing

Output a string to the console

Write the string "Hello World!" to STDOUT

ruby

puts "Hello World!"

$stdout<<"Hello World!"

cpp

std::cout << "Hello World" << std::endl;

std::printf("Hello World\n");

Console::WriteLine(L"Hello World");

fsharp

printfn "Hello World!"

erlang

io:format("Hello, World!~n").

Retrieve a string containing ampersands from the variables in a url

My PHP script first does a query to obtain customer info for a form. The form has first name and last name fields among others. The customer has put entries such as "Ron & Jean" in the first name field in the database. Then the edit form script is called with variables such as

"http://myserver.com/custinfo/edit.php?mode=view&fname=Ron & Jean&lname=Smith".

The script variable for first name $_REQUEST['firstname'] never gets beyond the "Ron" value because of the ampersand in the data.

I have tried various functions like urldecode but all to no avail. I even tried encoding the url before the view screen is painted so that the url looks like "http://myserver/custinfo/edit.php?mode=view&fname="Ronxxnbsp;xxamp;xxnbsp;Jean"&lname=SMITH". (sorry I had to add the xx to replace the ampersand or it didn't display meaningful url contents the browser sees.)

Of course this fails for the same reasons. What is a better approach?

ruby

gem 'uri-query_params'
require 'uri/query_params'

url = URI("http://myserver.com/custinfo/edit.php?mode=view&fname=Ron%20&%20Jean&lname=Smith")
url.query_params['fname']
# => "Ron & Jean"

url = "http://myserver.com/custinfo/edit.php?mode=view&fname=Ron & Jean&lname=Smith"
url = URI.parse(URI.encode(url))

cpp

QUrl url("http://myserver.com/custinfo/edit.php");
url.addQueryItem("mode", "view");
url.addQueryItem("fname", "Ron & Jean");
url.addQueryItem("lname", "Smith");
QByteArray encodedUrl = url.toEncoded();

fsharp

//the problem arises due to the fact that you've attempted to apply HTML entities encoding rather than URL encoding to your data!
//in F#, for example, assuming you would call this function with fname and lname parameters, this would produce the desired output
let getProperUrl fname lname = sprintf "http://myserver.com/custinfo/edit.php?mode=view&fname=%s&lname=%s" (HttpUtility.UrlEncode fname) (HttpUtility.UrlEncode lname)

// Example that shows encoding and decoding:
let queryString =
let fname = HttpUtility.UrlEncode("Ron & James")
let lname = HttpUtility.UrlEncode("Smith & Jones")
sprintf "http://myserver.com/custinfo/edit.php?mode=view&fname=%s&lname=%s" fname lname
/// All parameters in the URL as a lookup map
let parameters =
let paramStart = queryString.IndexOf('?')
if paramStart < 0 then
Map.empty
else
let values =
queryString.Substring(paramStart + 1)
|> HttpUtility.ParseQueryString
values.AllKeys
|> Seq.map (fun key -> key, values.[key])
|> Map.ofSeq
let fname = parameters.TryFind("fname")
let lname = parameters.TryFind("lname")

erlang

% encode ampersand in your string using %XX where XX is hex code for ampersand
% optionally encode spaces for completeness sake to keep URL solid
URL = "http://myserver.com/custinfo/edit.php?mode=view&fname=Ron%20%26%20Jean&lname=Smith",
{_, Query} = string:tokens(URL, "?"),
KeyValuePairs = string:tokens(Query, "&"),...

string-wrap

Wrap the string "The quick brown fox jumps over the lazy dog. " repeated ten times to a max width of 78 chars, starting each line with "> "

Expected output:
> The quick brown fox jumps over the lazy dog. The quick brown fox jumps over t
> he lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox
> jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The qui
> ck brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy
> dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps o
> ver the lazy dog. The quick brown fox jumps over the lazy dog.

ruby

str = "The quick brown fox jumps over the lazy dog. " * 10
outarr = str.scan(/[^ ].{0,76}/)
outarr.each{ |line| puts "> %s" % line }

cpp

#include <iostream>
#include <sstream>
#include <string>

using namespace std;

void rep(ostream &os, const string& str, int times)
{
while (times--)
os << str;
}

void wrap(ostream &os, const string& str, const string &prefix, int width)
{
for (int offset = 0; offset < str.size(); offset += width)
os << prefix << str.substr(offset, width) << endl;
}

int main()
{
stringstream input;

rep(input, "The quick brown fox jumps over the lazy dog. ", 10);
wrap(cout, input.str(), "> ", 78);
}

erlang

wrapper(String, Times, Length) ->
StrList = lists:reverse(formatter(string:copies(String, Times), Length, [])),
lists:foreach(fun(Str) -> io:format("~p~n", [Str]) end, StrList).

formatter([], _Length, Acc) -> Acc;
formatter(String, Length, Acc) when length(String) > Length - 1->
{Head, Tail} = lists:split(Length - 1, String),
formatter(string:strip(Tail), Length, [[$>, $ | Head] | Acc]);
formatter(String, Length, Acc) ->
formatter([], Length, [[$>, $ | String] | Acc]).

Declaration

Define a string containing special characters

Define the literal string "\#{'}${"}/"

ruby

special = '\#{\'}${"}/'

cpp

std::string special = "\\#{'}${\"}/";

String^ special = L"\\#{'}${\"}/";

fsharp

let special = "\#{'}${\"}/"

erlang

Special = "\\#{'}\${\"}/",

Define a multiline string

Define the string:

"This

Is

A

Multiline

String"

ruby

text = <<"HERE"
This
Is
A
Multiline
String
HERE

text = "This\nIs\nA\nMultiline\nString"

cpp

std::string text =
"This\n"
"Is\n"
"A\n"
"Multiline\n"
"String";

String^ text = L"This\nIs\nA\nMultiline\nString";

std::string text = "This\nIs\nA\nMultiline\nString";

fsharp

let multiline = "This\nIs\nA\nMultiline\nString"

let multiline = "This
Is
A
Multiline
String"

erlang

Text = "This\nIs\nA\nMultiline\nString",

Define a string containing variables and expressions

Given variables a=3 and b=4 output "3+4=7"

ruby

puts "#{a}+#{b}=#{a+b}"

puts "#{a}+#{b}=%s" % (a + b)

cpp

Console::WriteLine(L"{0}+{1}={2}", a, b, a+b);

std::printf("%d+%d=%d\n", a, b, a+b);

std::cout << boost::format("%|1|+%|1|=%|1|") % a % b % (a+b) << std::endl;

fsharp

let a, b = 3, 4
let mystr = sprintf "%d+%d=%d" a b (a+b)
printfn "%s" mystr

erlang

A = 3, B = 4,
io:format("~B+~B=~B~n", [A, B, (A+B)]).

Manipulation

Reverse the characters in a string

Given the string "reverse me", produce the string "em esrever"

ruby

puts "reverse me".reverse

cpp

String^ s = "reverse me";
array<Char>^ sa = s->ToCharArray();
Array::Reverse(sa);
String^ sr = gcnew String(sa);

std::string s = "reverse me";
std::reverse(s.begin(), s.end());

std::string s = "reverse me";
std::string sr(s.rbegin(), s.rend());

std::string s = "reverse me";
std::swap_ranges(s.begin(), (s.begin() + s.size() / 2), s.rbegin());

fsharp

let reversed = new String (Array.rev ("reverse me".ToCharArray()))

let word = "reverse me"
//reverse the word
let reversedword =
word.ToCharArray()
|> Array.fold(fun acc x -> x::acc) []

erlang

Reversed = lists:reverse("reverse me"),

Reversed = revchars("reverse me"),

Reverse the words in a string

Given the string "This is a end, my only friend!", produce the string "friend! only my end, the is This"

ruby

reversed = text.split.reverse.join(' ')

cpp

array<Char>^ sep = {L' '};
array<String^>^ words =
String(L"This is the end, my only friend!").Split(sep, StringSplitOptions::RemoveEmptyEntries);

Array::Reverse(words); String^ newwords = String::Join(L" ", words);

std::string words = "This is the end, my only friend!"; std::vector<std::string> swv;

boost::split(swv, words, boost::is_any_of(" ")); std::reverse(swv.begin(), swv.end());
std::string newwords = (std::for_each(swv.begin(), swv.end(), StringTAndJ())).value();

fsharp

let reversed = String.Join(" ", Array.rev("This is the end, my only friend!".Split [|' '|]))

erlang

Reversed = string:join(lists:reverse(string:tokens("This is the end, my only friend!", " ")), " "),

Text wrapping

Wrap the string "The quick brown fox jumps over the lazy dog. " repeated ten times to a max width of 78 chars, starting each line with "> ", yielding this result:

> The quick brown fox jumps over the lazy dog. The quick brown fox jumps
> over the lazy dog. The quick brown fox jumps over the lazy dog. The
> quick brown fox jumps over the lazy dog. The quick brown fox jumps
> over the lazy dog. The quick brown fox jumps over the lazy dog. The
> quick brown fox jumps over the lazy dog. The quick brown fox jumps
> over the lazy dog. The quick brown fox jumps over the lazy dog. The
> quick brown fox jumps over the lazy dog.

ruby

prefix = "> "
string = "The quick brown fox jumps over the lazy dog. " * 10
width = 78
realwidth = width - prefix.length
print string.gsub(/(.{1,#{realwidth}})(?: +|$)\n?|(.{#{realwidth}})/, "#{prefix}\\1\\2\n")

cpp

String^ input = ::copies("The quick brown fox jumps over the lazy dog. ", 10);
String^ sep = " "; String^ prefix = "> ";

String^ wrapped = textwrap(input, 74 - prefix->Length, sep, prefix);
Console::WriteLine("{0}", wrapped);

void rep(ostream &os, const string& str, int times)
{
while (times--)
os << str;
}

void wrap(ostream &os, const string& str, const string &prefix, int width)
{
int line_len = width;
bool first_word = true;

width -= prefix.size();
BOOST_FOREACH(string word, tokenizer<char_separator<char>>(str, char_separator<char>(" ")))
{
line_len += word.size();
if (line_len++ < width)
os << ' ';
else {
if (first_word)
first_word = false;
else
os << endl;
os << prefix;
line_len = word.size();
}
os << word;
}
os << endl;
}

int main()
{
stringstream input;

rep(input, "The quick brown fox jumps over the lazy dog. ", 10);
wrap(cout, input.str(), "> ", 72);
}

fsharp

let prefix = "> "
let input = "The quick brown fox jumps over the lazy dog. "

(String.split ['\n'] (textwrap (copies input 10) (73 - prefix.Length))) |> List.iter (fun line -> printfn "%s%s" prefix line)

let output maxWidth (s: string) =
let rec wrap = function
| lineSoFar, ([| |]: string array)-> printfn "%s" lineSoFar
| ">" as lineSoFar, (words: string array) ->
// Handle this case separately, thus we can also deal with
// cases where a word is longer then the max width
wrap (lineSoFar + " " + words.[0], Array.sub words 1 (words.Length - 1))
| lineSoFar, words when words.[0].Length + lineSoFar.Length >= maxWidth ->
printfn "%s" lineSoFar
wrap (">", words)
| lineSoFar, words ->
wrap(lineSoFar + " " + words.[0], Array.sub words 1 (words.Length - 1))
wrap (">", s.Split([| ' ' |]))

[| for i in 1 .. 10 do yield "The quick brown fox jumps over the lazy dog." |]
|> String.concat " "
|> output 78

erlang

TextWrap = textwrap(string:copies(Input, 10), 73 - length(Prefix)),
lists:foreach(fun (Line) -> io:format("~s~n", [string:concat(Prefix, Line)]) end, string:tokens(TextWrap, "\n")).

Remove leading and trailing whitespace from a string

Given the string " hello " return the string "hello".

ruby

puts " hello ".strip

" hello ".strip!

cpp

String^ s = " hello "; String^ trimmed = s->Trim();

fsharp

let s = " hello "
let trimmed = s.Trim()

let trimmed = " hello ".Trim()

erlang

Trimmed = string:strip(S),

Simple substitution cipher

Take a string and return the ROT13 and ROT47 (Check Wikipedia) version of the string.
For example:
String is: Hello World #123
ROT13 returns: Uryyb Jbeyq #123
ROT47 returns: w6==@ (@C=5 R`ab

ruby

rot13 = "Hello World #123".tr!("A-Za-z", "N-ZA-Mn-za-m")
rot47 = "Hello World #123".tr!("\x21-\x7e", "\x50-\x7e\x21-\x4f")

cpp

#include <algorithm>
#include <iostream>
#include <cctype>
using namespace std;

int rot13(int c) {
if (!isalpha(c)) {
return c;
} else {
char start = islower(c) ? 'a' : 'A';
return ((c - start) + 13) % 26 + start;
}
}

int rot47(int c) {
if (c < 33 || c > 126) {
return c;
} else {
return ((c - 33) + 47) % 94 + 33;
}
}

int main(int argc, char **argv) {
for (int i = 0; i < argc; ++i) {
string original = argv[i];

string rot13enc = original;
transform(original.begin(), original.end(), rot13enc.begin(), rot13);

string rot47enc = original;
transform(original.begin(), original.end(), rot47enc.begin(), rot47);

cout << "original: " << original << endl
<< "rot 13: " << rot13enc << endl
<< "rot 47: " << rot47enc << endl;
}
return 0;
}

fsharp

#light

let rotChar (s:int) (l:int) (h:int) (c:char) =
let charCode = int c
let letterCount = h - l + 1
let newCharCode = (charCode - l + s) % letterCount + l
char newCharCode

let rot13 (text:string) =
let rotChar13 = function
| (c:char) when 'A' <= c && c <= 'Z' -> rotChar 13 (int 'A') (int 'Z') c
| c when 'a' <= c && c <= 'z' -> rotChar 13 (int 'a') (int 'z') c
| c -> c
new string([| for c in text -> rotChar13 c|])

let rot47 (text:string) =
let rotChar47 = function
| ' ' as c -> c
| c -> rotChar 47 (int '!') (int '~') c
new string([| for c in text -> rotChar47 c |])

erlang

rot13(Str) ->
lists:map(fun(A) ->
if
A >= $A, A =< $Z -> ((A - $A + 13) rem 26) + $A;
A >= $a, A =< $z -> ((A - $a + 13) rem 26) + $a;
true -> A
end
end, Str).

rot47(Str) ->
lists:map(fun(A) ->
if
A >= $!, A =< $~ ->
((A - $! + 47) rem 94) + $!;
true -> A
end
end, Str).

Case

Make a string uppercase

Transform "Space Monkey" into "SPACE MONKEY"

ruby

uppper = text.upcase

cpp

String(L"Space Monkey").ToUpper();

std::string s = "Space Monkey";
std::transform(s.begin(), s.end(), s.begin(), std::toupper);

std::string s = "Space Monkey";
boost::to_upper(s);

fsharp

printfn "%s" ("Space Monkey".ToUpper())

printfn "%s" (String.uppercase "Space Monkey")

erlang

io:format("~s~n", [string:to_upper("Space Monkey")]).

Make a string lowercase

Transform "Caps ARE overRated" into "caps are overrated"

ruby

"Caps ARE overRated".downcase

cpp

std::string s = "Caps ARE overRated";
std::string sl(boost::to_lower_copy(s));

String(L"Caps ARE overRated").ToLower();

fsharp

printfn "%s" ("Caps ARE overRated".ToLower())

printfn "%s" (String.lowercase "Caps ARE overRated")

erlang

io:format("~s~n", [string:to_lower("Caps ARE overRated")]).

Capitalise the first letter of each word

Transform "man OF stEEL" into "Man Of Steel"

ruby

caps = text.gsub(/\w+/) { $&.capitalize }

caps = text.split.each{|i| i.capitalize!}.join(' ')

text.split.map(&:capitalize) * ' '

cpp

std::string words = "mAn OF stEEL";
std::transform(words.begin(), words.end(), words.begin(), ToCaps<>());

StringBuilder^ sb = gcnew StringBuilder(L"man OF stEEL");

for (int i = 0, isFirst = 1; i < sb->Length; ++i)
{
sb[i] = Char::IsWhiteSpace(sb[i]) ? (isFirst = 1, sb[i]) : isFirst ? (isFirst = 0, Char::ToUpper(sb[i])) : Char::ToLower(sb[i]);
}

std::string words = "mAn OF stEEL";
std::vector<std::string> swv;

boost::split(swv, words, boost::is_any_of(" "));
std::string newwords = (std::for_each(swv.begin(), swv.end(), StringTAndJ(WordToCaps))).value();

fsharp

let words = String.Join(" ", Array.map (fun (s : String) -> (String.capitalize (s.ToLower()))) ("man OF stEEL".Split [|' '|]))

let wordlst = List.map (fun s -> (String.capitalize (String.lowercase s))) (String.split [' '] "man OF stEEL")
let words = new StringBuilder(List.hd wordlst)
for (s : String) in (List.tl wordlst) do (words.Append(" ").Append(s))

// Previous solutions used old library functions, here's something that works with F# 2.0
let s= "man OF stEEL"
let UpperFirst = function | "" -> "" | s -> s.Substring(0,1).ToUpper() + s.Substring(1).ToLower()
s.Split(' ') |> Array.map UpperFirst |> String.concat " "

let culture = System.Globalization.CultureInfo.GetCultureInfo("en-US")
let titleCase = culture.TextInfo.ToTitleCase "man oF sTeel"

erlang

Caps = string:join(lists:map(fun(S) -> to_caps(S) end, string:tokens("man OF stEEL", " ")), " "),

Numbers

Mathematical

Find the distance between two points

ruby

# the hypotenuse sqrt(x**2+y**2)
distance = Math.hypot(x2-x1,y2-y1)

cpp

Point p1 = {34, 78}, p2 = {67, -45};
double distance = ::distance(p1, p2);
Console::WriteLine("{0,3:F2}", distance);

fsharp

let distance' = distance (34, 78) (67, -45)
printfn "%3.2f" distance'

erlang

Distance = distance({point, 34, 78}, {point, 67, -45}),
io:format("~.2f~n", [Distance]).

Distance = distance(point:new(34, 78), point:new(67, -45)),
io:format("~.2f~n", [Distance]).

Output

Zero pad a number

Given the number 42, pad it to 8 characters like 00000042

ruby

42.to_s.rjust(8,"0")

"%08d" % 42

cpp

String^ formatted = Convert::ToString(42)->PadLeft(8, '0');

String^ formatted = String::Format("{0,8:D8}", 42);

std::printf("%08d", 42);

std::ostringstream os;
os << std::setw(8) << std::setfill('0') << 42 << std::ends;
std::cout << os.str() << std::endl;

std::cout << boost::format("%|08|") % 42 << std::endl;

fsharp

printfn "%08d" 42

let formatted = sprintf "%08d" 42
printfn "%s" formatted

let buffer = new StringBuilder()
Printf.bprintf buffer "%08d" 42
printfn "%s" (buffer.ToString())

let formatted = String.Format("{0,8:D8}", 42)
Console.WriteLine(formatted)

let formatted = Convert.ToString(42).PadLeft(8, '0')
Console.WriteLine(formatted)

erlang

Formatted = io_lib:format("~8..0B", [42]),

io:format("~8..0B~n", [42]).

Right Space pad a number

Given the number 1024 right pad it to 6 characters "1024 "

ruby

1024.to_s.ljust(6)

cpp

String^ formatted = Convert::ToString(1024)->PadRight(6);

String^ formatted = String::Format("{0,-6:D}", 1024);

std::printf("%-6d\n", 1024);

std::ostringstream os;
os << std::setw(6) << std::setfill(' ') << std::left << 1024 << std::ends;
std::cout << os.str() << std::endl;

std::cout << boost::format("%|-6|") % 1024 << std::endl;

fsharp

printfn "%-6d" 1024

let formatted = String.Format("{0,-6:D}", 1024)
Console.WriteLine(formatted)

let formatted = Convert.ToString(1024).PadRight(6)
Console.WriteLine(formatted)

erlang

Formatted = io_lib:format("~-6B", [1024]),

io:format("~-6B~n", [1024]).

Format a decimal number

Format the number 7/8 as a decimal with 2 places: 0.88

ruby

(7.0/8.0*100).round/100.0

(7.0/8.0).round(2)

cpp

String^ formatted = String::Format("{0,3:F2}", result);

Console::WriteLine("{0,3:F2}", (7. / 8.));

std::printf("%3.2f\n", result);

std::ostringstream os;
os.width(3); os.fill('0'); os.setf(std::ios::fixed|std::ios::showpoint); os.precision(2);
os << result << std::ends;
std::cout << os.str() << std::endl;

std::cout << boost::format("%|3.2f|") % result << std::endl;

fsharp

printfn "%3.2f" (0.7 / 0.8)

let formatted = String.Format("{0,3:F2}", (0.7 / 0.8))
Console.WriteLine(formatted)

erlang

Formatted = io_lib:format("~.2f", [7/8]),

io:format("~.2f~n", [7/8]).

Left Space pad a number

Given the number 73 left pad it to 10 characters " 73"

ruby

73.to_s.rjust(10)

cpp

String^ formatted = Convert::ToString(73)->PadLeft(10);

String^ formatted = String::Format("{0,10:D}", 73);

std::printf("%10d\n", 73);

std::ostringstream os;
os << std::setw(10) << std::setfill(' ') << 73 << std::ends;
std::cout << os.str() << std::endl;

std::cout << boost::format("%|10|") % 73 << std::endl;

fsharp

let formatted = sprintf "%10d" 73
printfn "%s" formatted

let formatted = String.Format("{0,10:D}", 73)
Console.WriteLine(formatted)

let formatted = Convert.ToString(73).PadLeft(10)
Console.WriteLine(formatted)

erlang

Formatted = io_lib:format("~10B", [73]),

io:format("~10B~n", [73]).

Random

Generate a random integer in a given range

Produce a random integer between 100 and 200 inclusive

ruby

randomInt = rand(200-100+1)+100;

cpp

Random^ rnd = gcnew Random;
int rndInt = rnd->Next(100, 201);

std::srand(std::time(NULL));

unsigned lb = 100, ub = 200;
unsigned rnd = lb + (rand() % ((ub - lb) + 1));

typedef boost::uniform_int<> Distribution;
typedef boost::mt19937 RNG;

Distribution distribution(100, 200);
RNG rng; rng.seed(std::time(NULL));
boost::variate_generator<RNG&, Distribution> generator(rng, distribution);

unsigned rnd = generator();

fsharp

let rnd = new Random()
let rndInt = rnd.Next(100, 201)

erlang

RandomInt = gen_rand_integer(100, 200),

Generate a repeatable random number sequence

Initialise a random number generator with a seed and generate five decimal values. Reset the seed and produce the same values.

ruby

srand(12345)
first = (1..5).collect {rand}
srand(12345)
second = (1..5).collect {rand}
puts first == second

cpp

void printAction(int i) { Console::Write("{0} ", i); }

array<int>^ genFillRand(array<int>^ arr, Random^ rnd, int lb, int ub)
{
for (int i = 0; i < arr->Length; ++i) arr[i] = rnd->Next(lb, ub + 1); return arr;
}

int main()
{
array<int>^ arr1 = genFillRand(gcnew array<int>(5), gcnew Random(12345), 100, 200);
array<int>^ arr2 = genFillRand(gcnew array<int>(5), gcnew Random(12345), 100, 200);

Action<int>^ print = gcnew Action<int>(printAction);
Array::ForEach<int>(arr1, print); Console::WriteLine();
Array::ForEach<int>(arr2, print); Console::WriteLine();
}

typedef boost::uniform_int<> Distribution;
typedef boost::mt19937 RNG;

Distribution distribution(100, 200);
RNG rng;
boost::variate_generator<RNG&, Distribution> generator(rng, distribution);

rng.seed(42L);
std::generate_n(std::ostream_iterator<unsigned>(std::cout, " "), 5, generator);

rng.seed(42L);
std::cout << std::endl;
std::generate_n(std::ostream_iterator<unsigned>(std::cout, " "), 5, generator);

fsharp

let (seed, lb, ub) = (12345, 100, 200)

let mutable rnd = new Random(seed)
for i = 1 to 5 do printf "%d " (rnd.Next(lb, ub + 1)) done ; printfn ""

rnd <- new Random(seed)
for i = 1 to 5 do printf "%d " (rnd.Next(lb, ub + 1)) done ; printfn ""

erlang

setRNG(RNGState),
io:format("~w~n", [lists:map(fun (_) -> gen_rand_integer(100, 200) end, lists:seq(1, 5))]),

setRNG(RNGState),
io:format("~w~n", [lists:map(fun (_) -> gen_rand_integer(100, 200) end, lists:seq(1, 5))]).

Regex

Matching

Check if a string matches a regular expression

Display "ok" if "Hello" matches /[A-Z][a-z]+/

ruby

puts "ok" if ("Hello"=~/^[A-Z][a-z]+$/)

cpp

if ((gcnew Regex("[A-Z][a-z]+"))->IsMatch("Hello")) Console::WriteLine("ok");

if (Regex::IsMatch("Hello", "[A-Z][a-z]+")) Console::WriteLine("ok");

Regex^ rx = gcnew Regex("[A-Z][a-z]+");
if (rx->IsMatch("Hello")) Console::WriteLine("ok");

cmatch what;
if (regex_match("Hello", what, regex("[A-Z][a-z]+")))
cout << "ok" << endl;

fsharp

if (Regex.IsMatch("Hello", "[A-Z][a-z]+")) then printfn "ok"

erlang

String = "Hello", Regexp = "[A-Z][a-z]+",
is_match(String, Regexp) andalso (begin io:format("ok~n"), true end).

case re:run("Hello", "[A-Z][a-z]+") of {match, _} -> ok end.

Check if a string matches with groups

Display "two" if "one two three" matches /one (.*) three/

ruby

puts $1 if "one two three"=~/^one (.*) three$/

cpp

Match^ match = Regex::Match("one two three", "one (.*) three");
if (match->Success) Console::WriteLine("{0}", match->Groups[1]->Captures[0]);

cmatch what;
if (regex_match("one two three", what, regex("one (.*) three")))
cout << what[1] << endl;

fsharp

let regmatch = (Regex.Match("one two three", "one (.*) three"))
if regmatch.Success then (printfn "%s" (regmatch.Groups.[1].Captures.[0].ToString()))

erlang

case re:run("one two three", "one (.*) three", [{capture, [1], list}]) of {match, Res} -> hd(Res) end.

Searching

Check if a string contains a match to a regular expression

Display "ok" if "abc 123 @#$" matches /\d+/

ruby

puts "ok" if (text=~/\d+/)

cpp

if (Regex::IsMatch("abc 123 @#$", "\\d+")) Console::WriteLine("ok");

fsharp

if (Regex.IsMatch("abc 123 @#$", "\\d+")) then printfn "ok"

erlang

% Erlang uses 'egrep'-compatible regular expressions, so shortcuts like '\d' not supported
String = "abc 123 @#$", Regexp = "[0-9]+",
is_match(String, Regexp) andalso (begin io:format("ok~n"), true end).

case re:run("abc 123 @#$", "\\d+") of {match, _} -> ok end.

Loop through a string matching a regex and performing an action for each match

Create a list [fish1,cow3,boat4] when matching "(fish):1 sausage (cow):3 tree (boat):4" with regex /$(\w+)$:(\d+)/

ruby

list = text.scan(/$(\w+)$:(\d+)/).collect{|x| x.join}

list=[]
text.scan(/$(\w+)$:(\d+)/) {
list << $1+$2
}

cpp

Match^ match = Regex::Match("(fish):1 sausage (cow):3 tree (boat):4", "\$(\\w+)\$:(\\d+)");

while (match->Success)
{
list->Add(match->Groups[1]->Captures[0]->ToString() + match->Groups[2]->Captures[0]->ToString());
match = match->NextMatch();
}

fsharp

let list = new ResizeArray<string>()
let mutable regmatch = (Regex.Match("(fish):1 sausage (cow):3 tree (boat):4", "\$(\\w+)\$:(\\d+)"))

while regmatch.Success do
list.Add(regmatch.Groups.[1].Captures.[0].ToString() ^ regmatch.Groups.[2].Captures.[0].ToString())
regmatch <- regmatch.NextMatch()
done

for word in list do printfn "%s" word done

// A solution without mutation:
let results =
Regex.Matches("(fish):1 sausage (cow):3 tree (boat):4", "\$(\\w+)\$:(\\d+)")
|> Seq.cast
|> Seq.map (fun (regmatch: Match) ->
regmatch.Groups.[1].Captures.[0].ToString() + regmatch.Groups.[2].Captures.[0].ToString()
)
|> List.ofSeq

erlang

solve(S) ->
R = "\$(\\w+?)\$:(\\d+)",
{match, M} = re:run(S,R, [global, {capture, all_but_first, list}]),
[ A++N || [A, N] <- M].

Replacing

Replace the first regex match in a string with a static string

Transform "Red Green Blue" into "R*d Green Blue" by replacing /e/ with "*"

ruby

p "Red Green Blue".sub(/e/,'*')

cpp

String^ Replaced = (gcnew Regex("e"))->Replace("Red Green Blue", "*", 1);

fsharp

let replaced = ((new Regex("e")).Replace("Red Green Blue", "*", 1))
printfn "%s" replaced

erlang

{ok, Replaced, _} = regexp:sub("Red Green Blue", "e", "*"),

re:replace("Red Green Blue", "e", "*", [{return, list}]).

Replace all regex matches in a string with a static string

Transform "She sells sea shells" into "She X X shells" by replacing /se\w+/ with "X"

ruby

replaced = text.gsub(/se\w+/,"X")

cpp

String^ Replaced = (gcnew Regex("se\\w+"))->Replace("She sells sea shells", "X");

String^ Replaced = Regex::Replace("She sells sea shells", "se\\w+", "X");

fsharp

let replaced = ((new Regex("se\\w+")).Replace("She sells sea shells", "X"))
printfn "%s" replaced

erlang

% Erlang uses 'egrep'-compatible regular expressions, so shortcuts like '\w' not supported
{ok, Replaced, _} = regexp:gsub("She sells sea shells", "se[A-Za-z0-9_]+", "X"),

re:replace("She sells sea shells", "se\\w+", "X", [global, {return, list}]).

Replace all regex matches in a string with a dynamic string

Transform "The {Quick} Brown {Fox}" into "The kciuQ Brown xoF" by reversing words in braces using the regex /\{(\w+)\}/.

ruby

"The {Quick} Brown {Fox}".gsub(/\{(\w+)\}/) {|s| s[1..-2].reverse }

cpp

String^ Replaced = (gcnew Regex("{(\\w+)}"))->Replace("The {Quick} Brown {Fox}", gcnew MatchEvaluator(&RegRep::RepGroup));

String^ Replaced = Regex::Replace("The {Quick} Brown {Fox}", "{(\\w+)}", gcnew MatchEvaluator(&RegRep::RepGroup));

fsharp

open System
open System.Text.RegularExpressions
let reverseMatch (m:Match) =
String(m.Groups.[1].Value.ToCharArray() |> Array.rev)
let output = Regex.Replace("The {Quick} Brown {Fox}", @"\{(\w+)\}", reverseMatch)

erlang

% Erlang regular expressions lack both group capture and backreferences, thus this problem is not directly
% solvable. Presented solution is close, but not on-spec

String = "The {Quick} Brown {Fox}",
{match, FieldList} = regexp:matches(String, "\{([A-Za-z0-9_]+)\}"),

NewString = lists:foldl(fun ({Start, Length}, S) -> replstr(S, lists:reverse(string:substr(S, Start, Length)), Start) end, String, FieldList),

Lists

Declaration

Define an empty list

Assign the variable "list" to a list with no elements

ruby

list = []

list = Array.new

cpp

Generic::List<String^>^ list = gcnew Generic::List<String^>();

std::list<std::string> list;

fsharp

let list = []

let list = List.empty

let list = new Generic.List<string>()

let list = new Generic.LinkedList<string>()

erlang

List = [],

Define a static list

Define the list [One, Two, Three, Four, Five]

ruby

list = ['One', 'Two', 'Three', 'Four', 'Five']

list = %w(One Two Three Four Five)

cpp

array<String^>^ input = {"One", "Two", "Three", "Four", "Five"};
Generic::List<String^>^ list = gcnew Generic::List<String^>((Generic::IEnumerable<String^>^) input);

Generic::List<String^>^ list = gcnew Generic::List<String^>();

list->Add("One");
list->Add("Two");
list->Add("Three");
list->Add("Four");
list->Add("Five");

std::string input[] = {"One", "Two", "Three", "Four", "Five"};
std::list<std::string> list(input, input + 5);

std::list<std::string> list;

list.push_back("One");
list.push_back("Two");
list.push_back("Three");
list.push_back("Four");
list.push_back("Five");

list<string> lst = { "One", "Two", "Three", "Four", "Five" };

list<string> lst;
lst += "One", "Two", "Three", "Four", "Five";

fsharp

let list = ["One"; "Two"; "Three"; "Four"; "Five"]

let list = (new Generic.LinkedList<string>([|"One"; "Two"; "Three"; "Four"; "Five"|]))

let list = (new Generic.LinkedList<string>())

list.AddFirst("One") ; list.AddLast("Five") ; list.AddBefore(list.Find("Five"), "Four")
list.AddAfter(list.Find("One"), "Two") ; list.AddAfter(list.Find("Two"), "Three")

let list = (new Generic.List<string>())

[|"One"; "Two"; "Three"; "Four"; "Five"|] |> Array.iter (fun x -> list.Add(x))

erlang

List = [one, two, three, four, five],

List = ['One', 'Two', 'Three', 'Four', 'Five'],

Output

Join the elements of a list, separated by commas

Given the list [Apple, Banana, Carrot] produce "Apple, Banana, Carrot"

ruby

string = fruit.join(', ')

cpp

String^ result = String::Join(L", ", fruit->ToArray());

string fruits[] = {"Apple", "Banana", "Carrot"};
string result = boost::algorithm::join(fruits, ", ");

fsharp

let result = String.Join(", ", [|"Apple"; "Banana"; "Carrot"|])

let result = (List.fold_left (fun acc item -> acc ^ (", " ^ item)) (List.hd fruit) (List.tl fruit))

let result = (List.fold_left (fun (acc : StringBuilder) (item : string) -> acc.Append(", ").Append(item)) (new StringBuilder(List.hd fruit)) (List.tl fruit)).ToString()

erlang

Result = string:join(Fruit, ", "),

Result = lists:foldl(fun (E, Acc) -> Acc ++ ", " ++ E end, hd(Fruit), tl(Fruit)),

Result = lists:flatten([ hd(Fruit) | [ ", " ++ X || X <- tl(Fruit)]]).

Join the elements of a list, in correct english

Create a function join that takes a List and produces a string containing an english language concatenation of the list. It should work with the following examples:
join([Apple, Banana, Carrot]) = "Apple, Banana, and Carrot"
join([One, Two]) = "One and Two"
join([Lonely]) = "Lonely"
join([]) = ""

ruby

def join(arr)
return '' if not arr
case arr.size
when 0 then ''
when 1 then arr[0]
when 2 then arr.join(' and ')
else arr[0..-2].join(', ') + ', and ' + arr[-1]
end
end

cpp

Console::WriteLine(join(fruit));

string join(const vector<string> &s, int b=0)
{
switch (s.size() - b)
{
case 0: return "";
case 1: return s[b];
case 2: return s[b] + (s.size() > 2 ? "," : "") + " and " + s[b+1];
default: return s[b] + ", " + join(s, b+1);
}
}

fsharp

erlang

io:format("~s~n", [join(Fruit)]).

% ------

join([]) -> "";
join([W|Ws]) -> join(Ws, W).

join([], S) -> S;
join([W], S) -> join([], S ++ " and " ++ W);
join([W|Ws], S) -> join(Ws, S ++ ", " ++ W).

%% According to the reference manual, "string is not a data type in Erlang."
%% Instead it has lists of integers. But I/O functions in general accept
%% IO lists, where an IO list is either a list of IO lists or an integer.
%% This gives you O(1) string concatenation.

-module(commalist).
-export([join/1]).

join([]) -> "";
join([W]) -> W;
join([W1, W2]) -> [W1, " and ", W2];
join([W1, W2, W3]) -> [W1, ", ", W2, ", and ", W3];
join([W1|Ws]) -> [W1, ", ", join(Ws)].

Produce the combinations from two lists

Given two lists, produce the list of tuples formed by taking the combinations from the individual lists. E.g. given the letters ["a", "b", "c"] and the numbers [4, 5], produce the list: [["a", 4], ["b", 4], ["c", 4], ["a", 5], ["b", 5], ["c", 5]]

ruby

common = [] ; [4, 5].each {|n| ['a', 'b', 'c'].each {|l| common << [l, n]}}

cpp

Specialized::StringCollection^ combinations = gcnew Specialized::StringCollection;

for each(int number in numbers)
for each(String^ letter in letters)
combinations->Add(makeCombo(letter, number));

string letters[] = { "a", "b", "c" };
int numbers[] = { 4, 5 };
list<pair<string,int> > combo;

for (int n = 0; n < sizeof numbers / sizeof *numbers; n++)
for (int l = 0; l < sizeof letters / sizeof *letters; l++)
combo.push_back(make_pair(letters[l], numbers[n]));

cout << combo << endl;

fsharp

let combinations = (List.fold_left (fun acc number -> acc @ (List.map (fun letter -> (letter, number)) letters)) [] numbers)

let combinations aa bb =
aa
|> List.map (fun a -> bb |> List.map (fun b -> (a, b)))
|> List.concat

erlang

Combinations =
lists:foldl(fun (Number, Acc) -> Acc ++ lists:map(fun (Letter) -> {Letter, Number} end, Letters) end, [], Numbers),

Combinations = lists:keysort(2, sofs:to_external(sofs:product(sofs:set(Letters), sofs:set(Numbers))))

[[A, B] || A <- ["a", "b", "c"], B <- [4, 5]].

From a List Produce a List of Duplicate Entries

Taking a list:
["andrew", "bob", "chris", "bob"]

Write the code to produce a list of duplicates in the list:
["bob"]

ruby

foo = ['andrew', 'bob', 'chris', 'bob']
foo.inject({}) {|h,v| h[v]=h[v].to_i+1; h}.reject{|k,v| v==1}.keys

cpp

vector<string> lst = { "andrew", "bob", "chris", "bob" };
vector<string> lst_no_dups;
vector<string> tmp;
vector<string> dups;

sort(lst.begin(), lst.end());
unique_copy(lst.begin(), lst.end(), back_inserter(lst_no_dups));
set_difference(lst.begin(), lst.end(),
lst_no_dups.begin(), lst_no_dups.end(),
back_inserter(tmp));
unique_copy(tmp.begin(), tmp.end(), back_inserter(dups));

cout << dups << endl;

list<string> lst = { "andrew", "bob", "chris", "bob" };
map<string,int> num_identical;
list<string> dups;

for (auto &s: lst)
num_identical[s]++;
for (auto &n: num_identical)
if (n.second > 1)
dups.push_back(n.first);
cout << dups << endl;

fsharp

["andrew"; "bob"; "chris"; "bob"]
|> Seq.countBy id
|> Seq.filter (fun (k,n) -> n > 1)
|> Seq.map fst
|> Seq.toList

erlang

{_, Result} = lists:foldl(
fun(X, {Uniq, Dupl}) -> case lists:member(X, Uniq) of
true -> {Uniq,[X | Dupl]};
_ -> {[X | Uniq], Dupl}
end
end,
{[], []},
List),

Fun = fun
([X | Xs], F) -> case lists:member(X, Xs) of
true -> [X | F(Xs, F)];
_ -> F(Xs, F)
end;
([], _) -> []
end,
Result = Fun(List, Fun).

Access

Fetch an element of a list by index

Given the list [One, Two, Three, Four, Five], fetch the third element ('Three')

ruby

list = ['One', 'Two', 'Three', 'Four', 'Five']
list[2]

['One', 'Two', 'Three', 'Four', 'Five'].fetch(2)

list = ['One', 'Two', 'Three', 'Four', 'Five']
list.at(2)

['One', 'Two', 'Three', 'Four', 'Five'][2] # <= note the [2] at end of array

cpp

String^ result = list[2];

fsharp

let result = List.nth ["One"; "Two"; "Three"; "Four"; "Five"] 2

erlang

Result = lists:nth(3, List),

Result = element(3, list_to_tuple(List)),

{Left, _} = lists:split(3, List), Result = lists:last(Left),

Result = nth0(2, List),

Fetch the last element of a list

Given the list [Red, Green, Blue], access the last element ('Blue')

ruby

['Red', 'Green', 'Blue'][-1]

['Red', 'Green', 'Blue'].at(-1)

['Red', 'Green', 'Blue'].last

['Red', 'Green', 'Blue'].fetch(-1)

cpp

String^ result = list[list->Count - 1];

string last_elem = lst.back();

fsharp

let last list =
let rec last' list' =
match list' with
| [x] -> x
| x :: xs -> last' xs
if List.is_empty list then failwith "empty list" else last' list

// ------

let result = last list

let result = (List.nth list ((List.length list) - 1))

let result = (List.hd (List.rev list))

erlang

Result = lists:last(List),

Result = last(List),

Result = hd(lists:reverse(List)),

Result = lists:nth(length(List), List),

Find the common items in two lists

Given two lists, find the common items. E.g. given beans = ['broad', 'mung', 'black', 'red', 'white'] and colors = ['black', 'red', 'blue', 'green'], what are the bean varieties that are also color names?

ruby

common = (beans.intersection(colors)).to_a

cpp

array<String^>^ inbeans = {"broad", "mung", "black", "red", "white"};
Generic::ICollection<String^>^ beans = makeSET<String^>(gcnew Generic::List<String^>((Generic::IEnumerable<String^>^) inbeans));

array<String^>^ incolors = {"black", "red", "blue", "green"};
Generic::ICollection<String^>^ colors = makeSET<String^>(gcnew Generic::List<String^>((Generic::IEnumerable<String^>^) incolors));

Generic::ICollection<String^>^ result = intersectSET<String^>(beans, colors);

fsharp

let beans = (Set.of_list ["broad"; "mung"; "black"; "red"; "white"])
let colors = (Set.of_list ["black"; "red"; "blue"; "green"])
let common = (Set.intersect beans colors)

let beans = Set ["broad"; "mung"; "black"; "red"; "white"]
let colors = Set ["black"; "red"; "blue"; "green"]
let common = Set.intersect beans colors

// Iterates elements of
// list1 across Elements of list2 returning a list of string options
// as generated by List.tryFind
let findCommon(list1 : 'a list, list2 : 'a list) : 'a list =
list1 |> List.map(fun y -> list2 |> List.tryFind(fun x -> y = x))
// Iterates elements of string option list generated above
// returning a string list containing common elements of List1 and List2
|> List.fold(fun acc x -> if x <> None then x.Value::acc else acc) []
// reverse order of list (can't seem to make List.foldBack work for this
|> List.rev

let beans = ["broad"; "mung"; "black"; "red"; "white"]
let colors = ["black"; "red"; "blue"; "green"]
printfn "%A" (findCommon(beans, colors)) ;;

erlang

Beans = sets:from_list([broad, mung, black, red, white]), Colors = sets:from_list([black, red, blue, green]),

Common = sets:to_list(sets:intersection(Beans, Colors)),

Display the unique items in a list

Display the unique items in a list, e.g. given ages = [18, 16, 17, 18, 16, 19, 14, 17, 19, 18], display the unique elements, i.e. with duplicates removed.

ruby

ages = [18, 16, 17, 18, 16, 19, 14, 17, 19, 18]
p ages.uniq

ages = [18, 16, 17, 18, 16, 19, 14, 17, 19, 18]
ages.uniq!
p ages

ages = (Set.new [18, 16, 17, 18, 16, 19, 14, 17, 19, 18]).to_a
p ages

cpp

array<int>^ input = {18, 16, 17, 18, 16, 19, 14, 17, 19, 18};
Generic::List<int>^ ages = gcnew Generic::List<int>((Generic::IEnumerable<int>^) input);

Generic::ICollection<int>^ result = makeSET<int>(ages);

list<int> input;
input += 18, 16, 17, 18, 16, 19, 14, 17, 19, 18;
input.sort();
unique_copy(input.begin(), input.end(), ostream_iterator<int>(cout, "\n"));

fsharp

(Set.ofList [18; 16; 17; 18; 16; 19; 14; 17; 19; 18]) |> Set.iter (fun age -> printf "%d, " age)

erlang

Ages = sets:to_list(sets:from_list([18, 16, 17, 18, 16, 19, 14, 17, 19, 18])), io:format("~w~n", [Ages]).

lists:usort([18, 16, 17, 18, 16, 19, 14, 17, 19, 18]).

Modification

Remove an element from a list by index

Given the list [Apple, Banana, Carrot], remove the first element to produce the list [Banana, Carrot]

ruby

['Apple', 'Banana', 'Carrot'].shift

fruit.delete_at(0)

cpp

fruit->RemoveAt(0);

fsharp

let split_at list n =
let rec split_at' list' n' left right =
match list' with
| [] -> (List.rev left, List.rev right)
| x :: xs -> if n' <= n then split_at' xs (n' + 1) (x :: left) right else split_at' xs (n' + 1) left (x :: right)
split_at' list 0 [] []

// ------

let (_, right) = split_at fruit 0

let drop list n =
if n <= 0 then
list
else
let (_, right) = split_at list (n - 1)
right

// ------

let result = (drop fruit 1)

erlang

Result = tl(List),

[_|Result] = List,

N = 1, {Left, Right} = lists:split(N - 1, List), Result = Left ++ tl(Right),

Result = drop(1, List),

Remove the last element of a list

ruby

list = ['Apple', 'Banana', 'Carrot']
list.delete_at(-1)

list = ['Apple', 'Banana', 'Carrot']
list.pop

cpp

fruit->RemoveAt(fruit->Count - 1);

fsharp

let take list n =
if n <= 0 then
list
else
let (left, _) = split_at list (n - 1)
left

// ------

let result = (take fruit ((List.length fruit) - 1))

let but_last list =
let rec but_last' list' acc =
match list' with
| [x] -> List.rev acc
| x :: xs -> but_last' xs (x :: acc)
if List.is_empty list then [] else but_last' list []

// ------

let result = (but_last fruit)

erlang

Result = init(List),

Result = take(length(List) - 1, List),

Result = lists:reverse(tl(lists:reverse(List))),

Rotate a list

Given a list ["apple", "orange", "grapes", "bananas"], rotate it by removing the first item and placing it on the end to yield ["orange", "grapes", "bananas", "apple"]

ruby

items = ["apple", "orange", "grapes", "bananas"]
items << first = items.shift

# items is rotated
# first contains the first value in the list

cpp

fruit->Add(fruit[0]); fruit->RemoveAt(0);

rotate(fruit.begin(), fruit.begin()+1, fruit.end());

fsharp

let rotate list n =
if n <= 0 then
list
else
let (left, right) = split_at list (n - 1)
right @ left

// ------

let result = (rotate fruit 1)

erlang

N = 1, {Left, Right} = lists:split(N, List), Result = Right ++ Left,

N = 1, Result = rotate(N, List),

Manipulation

Gather together corresponding elements from multiple lists

Given several lists, gather together the first element from every list, the second element from every list, and so on for all corresponding index values in the lists. E.g. for these three lists, first = ['Bruce', 'Tommy Lee', 'Bruce'], last = ['Willis', 'Jones', 'Lee'], years = [1955, 1946, 1940] the result should produce 3 actors. The middle actor should be Tommy Lee Jones.

ruby

first = ['Bruce', 'Tommy Lee', 'Bruce']; last = ['Willis', 'Jones', 'Lee']; years = [1955, 1946, 1940]

result = first.zip(last, years)

first = ['Bruce', 'Tommy Lee', 'Bruce']; last = ['Willis', 'Jones', 'Lee']; years = [1955, 1946, 1940]

result = [first, last, years].transpose

cpp

array<String^>^ first = {"Bruce", "Tommy Lee", "Bruce"}; array<String^>^ last = {"Willis", "Jones", "Lee"}; array<String^>^ years = {"1955", "1946", "1940"};

array<String^>^ result = zip<String^>(",", first, last, years);

list<string> first = { "Bruce", "Tommy Lee", "Bruce" };
list<string> last = {"Willis", "Jones", "Lee"};
list<int> years = {1955, 1946, 1940};
list<tuple<string,string,int> > actors;

for (firstIt = first.begin(), lastIt = last.begin(), yearIt = years.begin();
firstIt != first.end() && lastIt != last.end() && yearIt != years.end();
++firstIt, ++lastIt, ++yearIt)
actors.push_back(make_tuple(*firstIt, *lastIt, *yearIt));

fsharp

let result = (List.zip3 first last years)

erlang

First = ['Bruce', 'Tommy Lee', 'Bruce'], Last = ['Willis', 'Jones', 'Lee'], Years = [1955, 1946, 1940],

Result = lists:zip3(First, Last, Years),

List Combinations

Given two source lists (or sets), generate a list (or set) of all the pairs derived by combining elements from the individual lists (sets). E.g. given suites = ['H', 'D', 'C', 'S'] and faces = ['2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K', 'A'], generate the deck of 52 cards, confirm the deck size and check it contains an expected card, say 'Ace of Hearts'.

ruby

suites.each {|s| faces.each {|f| cards << [s, f]}}
puts "Deck %s \'Ace of Hearts\'" % if cards.include?(['h', 'A']) then "contains" else "does not contain" end

cpp

Specialized::StringCollection^ cards = gcnew Specialized::StringCollection;

for each(String^ suite in suites)
for each(String^ face in faces)
cards->Add(makeCard(suite, face));

Console::WriteLine("Deck has {0} cards", cards.Count);
if (cards->Contains(makeCard("h", "A"))) Console::WriteLine("Deck contains 'Ace of hearts'"); else Console::WriteLine("'Ace of hearts' not in deck");

auto suites = {"h", "d", "c", "s"};
auto faces = {"2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A"};
list<card> cards;

for (auto s: suites)
for (auto f: faces)
cards.push_back(make_pair(s,f));

cout << "Deck has " << cards.size() << " cards." << endl;

card ace_of_harts = make_pair("h", "A");
if (end(cards) != find_if(begin(cards), end(cards),
[&](const card& c) { return c == ace_of_harts; }))
cout << "Deck contain 'Ace of Harts'" << endl;
else
cout << "Deck lacks 'Ace of Harts'" << endl;

fsharp

let cards = (List.fold_left (fun acc suite -> acc @ (List.map (fun face -> (suite, face)) faces)) [] suites)

printfn "Deck has %d cards" (List.length cards)
printfn "%s" (if (List.exists (fun e -> e = ("h", "A")) cards) then "Deck contains 'Ace of Hearts'" ; else "'Ace of Hearts' not in deck")

let product (set1 : List<'a>) (set2 : List<'a>) : List<'a * 'a> =
let p = new ResizeArray<'a * 'a>()
for e1 in set1 do for e2 in set2 do p.Add(e1, e2) done done
Array.to_list (p.ToArray())

// ------

let cards = product suites faces

printfn "Deck has %d cards" (List.length cards)
printfn "%s" (if (List.exists (fun e -> e = ("h", "A")) cards) then "Deck contains 'Ace of Hearts'" ; else "'Ace of Hearts' not in deck")

erlang

Cards = lists:foldl(fun (Suite, Acc) -> Acc ++ lists:flatmap(fun (Face) -> [{Suite, Face}] end, Faces) end, [], Suites),

io:format("Deck has ~B cards~n", [length(Cards)]),
IsMember = lists:member({h, 'A'}, Cards),
io:format("~s~n", [if IsMember -> "Deck contains 'Ace of Hearts'" ; true -> "'Ace of Hearts' not in deck" end]),

Cards = sofs:to_external(sofs:product(sofs:set(Suites), sofs:set(Faces))),

io:format("Deck has ~B cards~n", [length(Cards)]),
IsMember = lists:member({h, 'A'}, Cards),
io:format("~s~n", [if IsMember -> "Deck contains 'Ace of Hearts'" ; true -> "'Ace of Hearts' not in deck" end]),

Deck2 = [{S, V} || S <- [d, c, h, s], V <- [2, 3, 4, 5, 6, 7, 8, 9, 10, 'J', 'Q', 'K', 'A']],
52 = length(Deck2),
true = lists:member({h, 'A'}, Deck2).

Perform an operation on every item of a list

Perform an operation on every item of a list, e.g.
for the list ["ox", "cat", "deer", "whale"] calculate
the list of sizes of the strings, e.g. [2, 3, 4, 5]

ruby

["ox", "cat", "deer", "whale"].map{|i| i.length}

cpp

list<string> words;

words.push_back("ox");
words.push_back("cat");
words.push_back("deer");
words.push_back("whale");

for (list<string>::iterator it = words.begin(); it != words.end(); ++it)
cout << it->size() << ' ';
cout << endl;

auto words = { "ox", "cat", "deer", "whale" };
list<size_t> word_sizes;

transform(begin(words),
end(words),
back_inserter(word_sizes),
[](const string& s) { return s.size(); });

fsharp

let lengths = List.map String.length ["ox"; "cat"; "deer"; "whale"]

erlang

lists:map(fun (X) ->length(X) end, List).

Split a list of things into numbers and non-numbers

Given a list that might contain e.g. a string, an integer, a float and a date,
split the list into numbers and non-numbers.

ruby

now=Time.now
things=["hello", 25, 3.14, now]

numbers=things.select{|i| i.is_a? Numeric}
others=things-numbers

now=Time.now
things=["hello", 25, 3.14, now]

numbers, others=things.partition{|i| i.is_a? Numeric}

cpp

typedef variant<int,float,string,date> dynamic;

class is_number : public static_visitor<bool>
{
public:
bool operator()(int &) const {
return true;
}
bool operator()(float &) const {
return true;
}
bool operator()(string &) const {
return false;
}
bool operator()(date &) const {
return false;
}
};

int main()
{
list<dynamic> lst;
list<dynamic> numbers;
list<dynamic> non_numbers;

lst += "hello", 3.14f, 42, date(2011,Aug,23);

BOOST_FOREACH(dynamic v, lst)
if (apply_visitor(is_number(), v))
numbers += v;
else
non_numbers += v;

#include <iostream>
#include <list>

#include <boost/any.hpp>
#include <boost/date_time/gregorian/gregorian.hpp>
#include <boost/foreach.hpp>

using namespace boost;
using namespace boost::gregorian;
using namespace std;

int main()
{
list<any> lst;
list<any> numbers;
list<any> non_numbers;

lst.push_back(string("hello"));
lst.push_back(42);
lst.push_back(3.14f);
lst.push_back(date(day_clock::local_day()));

BOOST_FOREACH(const any &a, lst)
try
{
numbers.push_back(any_cast<int>(a));
}
catch (bad_any_cast &e)
{
try
{
numbers.push_back(any_cast<float>(a));
}
catch (bad_any_cast &e)
{
non_numbers.push_back(a);
}
}

// float and int are now in 'numbers' and the rest in 'non_numbers'
}

fsharp

erlang

% Wrapped call to the auxiliary function
number_split(Xs) ->
number_split(Xs, [], []).

% The auxiliary function
number_split([], Num, NonNum) ->
{Num, NonNum};
number_split([X|Xs], Num, NonNum) ->
case is_number(X) of
true ->
number_split(Xs, [X|Num], NonNum);
false ->
number_split(Xs, Num, [X|NonNum])
end.

List = ["hello", 25, 3.14, calendar:local_time()],
{Numbers, NonNumbers} = lists:partition(fun(E) -> is_number(E) end, List)

Testing

Test if a condition holds for all items of a list

Given a list, test if a certain logical condition (i.e. predicate) holds for all items of the list.

ruby

[2, 3, 4].all? { |x| x > 1 }

cpp

template <typename InputIterator, typename Predicate>
bool match_all(InputIterator first, InputIterator last, Predicate pred)
{
return find_if(first, last, !pred(_1)) == last;
}

fsharp

let rec IsAll predicate source =
let mutable acc = true
for e in source do
acc <- acc && (predicate e)
acc

erlang

Result = lists:all(Pred, List).

Test if a condition holds for any items of a list

Given a list, test if a certain logical condition (i.e. predicate) holds for any items of the list.

ruby

[2, 3, 4].any? { |x| x > 3 }

cpp

template <typename InputIterator, typename Predicate>
bool match_any(InputIterator first, InputIterator last, Predicate pred)
{
return find_if(first, last, pred) != last;
}

fsharp

let rec IsAny predicate source =
match source with
| [] -> false
| h::t ->
if (predicate h) then true
else (IsAny predicate t )

erlang

Result = lists:any(Pred, List).

Maps

Declaration

Define an empty map

ruby

map = {}

cpp

Hashtable^ hash = gcnew Hashtable;

Generic::Dictionary<String^, String^>^ dict = gcnew Generic::Dictionary<String^, String^>();

std::map<int, std::string> m;

fsharp

let map = Map.empty

let map = new Generic.Dictionary<string, string>()

let map = new Hashtable()

erlang

Map = dict:new(),

Map = orddict:new(),

Map = gb_trees:empty(),

Map = ets:new(the_map_name, [set, private, {keypos, 1}]),

Define an unmodifiable empty map

ruby

map = {}.freeze

cpp

const std::map<T1,T2> immutable_map_instance_of_type_t1_to_t2;

fsharp

// Most native fsharp data structures are immutable - updating a 'map' sees a modified copy created
let map = Map.empty

erlang

% Erlang data structures are immutable - updating a 'map' sees a modified copy created
Map = dict:new(),

Define an initial map

Define the map {circle:1, triangle:3, square:4}

ruby

shapes = {'circle'=>1, 'triangle'=>3, 'square'=>4}

shapes = Hash['circle', 1, 'triangle', 3, 'square', 4]

shapes = { :circle => 1, :triangle => 3, :square => 4 }

cpp

Hashtable^ shapes = gcnew Hashtable;

shapes->Add("circle", 1);
shapes->Add("triangle", 3);
shapes->Add("square", 4);

Generic::Dictionary<String^, int>^ shapes = gcnew Generic::Dictionary<String^, int>();

shapes->Add("circle", 1);
shapes->Add("triangle", 3);
shapes->Add("square", 4);

map<string, int> shapes;

shapes["circle"] = 1;
shapes["triangle"] = 3;
shapes["square"] = 4;

fsharp

let shapes = Map.ofList [("circle", 1); ("triangle", 3); ("square", 4)]

let shapes = Map.empty.Add("circle", 1).Add("triangle", 3).Add("square", 4)

let shapes = new Generic.Dictionary<string, int>()
shapes.Add("circle", 1)
shapes.Add("triangle", 3)
shapes.Add("square", 4)

let shapes = Map [("circle", 1); ("triangle", 3); ("square", 4)]

erlang

Map = dict:from_list([{circle, 1}, {triangle, 3}, {square, 4}]),

Map0 = dict:new(),

% Erlang variables are 'single-assignment' i.e. they cannot be reassigned
Map1 = dict:store(circle, 1, Map0),
Map2 = dict:store(triangle, 3, Map1),
Map3 = dict:store(square, 4, Map2),

Map0 = gb_trees:empty(),

Map1 = gb_trees:enter(circle, 1, Map0),
Map2 = gb_trees:enter(triangle, 3, Map1),
Map3 = gb_trees:enter(square, 4, Map2),

Map = gb_trees:from_orddict(lists:keysort(1, [{circle, 1}, {triangle, 3}, {square, 4}])),

Map = ets:new(the_map_name, [ordered_set, private, {keypos, 1}]),
ets:insert(Map, [{circle, 1}, {triangle, 3}, {square, 4}]),

Access

Check if a key exists in a map

Given a map pets {joe:cat,mary:turtle,bill:canary} print "ok" if an pet exists for "mary"

ruby

puts "ok" if map.has_key?('mary')

puts "ok" if map['mary'] # Only works if map entry can't be nil or false

cpp

if (pets->ContainsKey("mary")) Console::WriteLine("ok");

if (pets.find("mary") != pets.end()){
std::cout << "ok" << std::endl;
}

if (pets.count("mary") > 0)
cout << "ok" << endl;

fsharp

if (Map.mem "mary" pets) then printfn "ok"

if pets.ContainsKey("mary") then printfn "ok"

erlang

dict:is_key(mary, Pets) andalso begin io:format("ok~n"), true end.

IsMember = ets:member(Pets, mary), if (IsMember) -> io:format("ok~n") ; true -> false end.

case gb_trees:lookup(mary, Pets) of none -> false ; _ -> io:format("ok~n") end.

Retrieve a value from a map

Given a map pets {joe:cat,mary:turtle,bill:canary} print the pet for "joe" ("cat")

ruby

puts map['joe']

cpp

if (pets->ContainsKey("joe")) Console::WriteLine(pets["joe"]);

cout << pets["joe"] << endl;

fsharp

if (Map.mem "joe" pets) then printfn "%s" (Map.find "joe" pets)

if (pets |> Map.exists (fun key _ -> key = "joe")) then printfn "%s" (Map.find "joe" pets)

let key = "joe"
match (pets |> Map.tryfind key) with
| Some(value) -> printfn "%s" value
| None -> printfn "Key %s not found" key

if pets.ContainsKey("joe") then printfn "%s" pets.["joe"]

if pets.ContainsKey("joe") then printfn "%s" (pets.["joe"] :?> string)

erlang

dict:is_key(joe, Pets) andalso begin io:format("~w~n", [dict:fetch(joe, Pets)]), true end.

case dict:find(joe, Pets) of error -> false ; {ok, Pet} -> io:format("~w~n", [Pet]) end.

IsMember = ets:member(Pets, joe), if (IsMember) -> io:format("~w~n", [ets:lookup_element(Pets, joe, 2)]) ; true -> false end.

case ets:match(Pets, {joe, '$1'}) of [] -> false ; [[Pet]] -> io:format("~w~n", [Pet]) end.

case gb_trees:lookup(joe, Pets) of none -> false ; {value, Pet} -> io:format("~w~n", [Pet]) end.

Add an entry to a map

Given an empty pets map, add the mapping from "rob" to "dog"

ruby

pets['rob']='dog'

cpp

pets->Add("rob", "dog");

pets["rob"] = "dog";

fsharp

pets <- (Map.add "rob" "dog" pets)

pets.Add("rob", "dog")

erlang

Pets1 = dict:store(rob, dog, Pets0).

ets:insert(Pets, {rob, dog}).

Pets1 = gb_trees:enter(rob, dog, Pets0).

Remove an entry from a map

Given a map pets {joe:cat,mary:turtle,bill:canary} remove the mapping for "bill" and print "canary"

ruby

puts map.delete :bill

cpp

if (pets->ContainsKey("bill"))
{
String^ value = safe_cast<String^>(pets["bill"]); pets->Remove("bill");
Console::WriteLine("{0}", value);
}

fsharp

let key = "bill"
match (pets |> Map.tryFind key) with
| Some(value) -> pets <- (Map.remove key pets) ; printfn "%s : %s removed" key value
| None -> printfn "Key %s not found" key

let key = "bill"
let entry = if (pets.ContainsKey(key)) then Some(pets.[key]) ; else None
pets.Remove(key)

match entry with
| Some(value) -> printfn "%s" value
| None -> printfn "key not found"

erlang

Pet = dict:fetch(bill, Pets0), Pets1 = dict:erase(bill, Pets0), io:format("~w~n", [Pet]),

Pet = ets:lookup_element(Pets, bill, 2), ets:delete(Pets, bill), io:format("~w~n", [Pet]),

{value, Pet} = gb_trees:lookup(bill, Pets0), Pets1 = gb_trees:delete(bill, Pets0), io:format("~w~n", [Pet]),

Algorithms

Create a histogram map from a list

Given the list [a,b,a,c,b,b], produce a map {a:2, b:3, c:1} which contains the count of each unique item in the list

ruby

histogram = {}
list.each { |item| histogram[item] = (histogram[item] || 0) +1 }

list = %w{a b a c b b}

histogram = list.each_with_object(Hash.new(0)) do |item, hash|
hash[item] += 1
end

p histogram # => {"a"=>2, "b"=>3, "c"=>1}

list.inject(Hash.new(0)) {|h, item| h[item] += 1; h}

cpp

for each(String^ entry in input) hash[entry] = hash->ContainsKey(entry)
? Convert::ToInt32(hash[entry]->ToString()) + 1 : 1;

for each(String^ entry in input) dict[entry] = dict->ContainsKey(entry) ? dict[entry] + 1 : 1;

map<string,int> hist;
for (auto e: { "a","b","a","c","b","b" })
++hist[e];
for (auto e: hist)
cout << e.first << " : " << e.second << endl;

fsharp

let histogram = (List.foldLeft (fun (acc : Map<char, int>) (e : char) -> if (Map.mem e acc) then (Map.add e ((Map.find e acc) + 1) acc) ; else (Map.add e 1 acc)) (Map.empty) list)

let histogram list =
let rec histogram' list' dict' =
match list' with
| [] -> dict'
| x :: xs ->
match Map.tryFind x dict' with
| Some(Value) -> histogram' xs (Map.add x (Value + 1) dict')
| None -> histogram' xs (Map.add x 1 dict')
histogram' list Map.empty

// ------

let histogram' = histogram list

let histogram = (List.foldLeft (fun (acc : Generic.Dictionary<char, int>) (e : char) -> (if acc.ContainsKey(e) then acc.[e] <- acc.[e] + 1 ; else acc.Add(e, 1)) ; acc) (new Generic.Dictionary<char, int>()) list)

let histogram =
list
|> Seq.groupBy (fun a -> a)
|> Seq.map(fun (key, elements) -> key, Seq.length elements)
|> Map.ofSeq

erlang

% Imperative Solution
Histogram = histogram(List),

% Functional (1) Solution
Histogram = histogram(List),

lists:foldl(fun(Elem, OldDict) ->
dict:update_counter(Elem, 1, OldDict)
end,
dict:new(),
[a,b,a,c,b,b])).

Categorise a list

Given the list [one, two, three, four, five] produce a map {3:[one, two], 4:[four, five], 5:[three]} which sorts elements into map entries based on their length

ruby

lengths = {}
list.each do |x|
len = x.size
lengths[len] = (lengths[len] || [])
lengths[len] << x
end

lengths = list.group_by {|x| x.size}

list.inject({}) { |h,x| (h[x.size]||=[]) << x; h }

cpp

for each(String^ entry in input)
{
key = entry->Length;
if (!hash->ContainsKey(key)) hash[key] = gcnew ArrayList;
safe_cast<ArrayList^>(hash[key])->Add(entry);
}

fsharp

let catmap = (List.foldLeft (fun (acc : Map<int, List<string> >) (e : string) -> if (Map.mem e.Length acc) then (Map.add e.Length ((Map.find e.Length acc) @ [e]) acc) ; else (Map.add e.Length [e] acc)) (Map.empty) list)

let lengthMap =
["one"; "two"; "three"; "four"; "five"]
|> Seq.groupBy (fun s -> s.Length)
|> Seq.map (fun (length, entries) -> (length, entries |> List.ofSeq))
|> Map.ofSeq

erlang

% Imperative Solution
CatList = categorise(List),

% Functional (1) Solution
CatList = categorise(List),

Structure

Conditionals

Perform an action if a condition is true (IF .. THEN)

Given a variable name, if the value is "Bob", display the string "Hello, Bob!". Perform no action if the name is not equal.

ruby

if (name=='Bob')
puts "Hello, Bob!"
end

puts "Hello, Bob!" if name=='Bob'

cpp

if (name == "Bob") Console::WriteLine("Hello, {0}!", name);

if (name == "Bob") std::cout << "Hello, " << name << "!" << std::endl;

fsharp

if name = "Bob" then printfn "Hello, %s!" name

name = "Bob" && begin printfn "Hello, %s!" name ; true end

erlang

if (Name == "Bob") -> io:format("Hello, ~s!~n", [Name]) ; true -> false end.

case Name of "Bob" -> io:format("Hello, ~s!~n", [Name]) ; _ -> false end.

Name == "Bob" andalso (begin io:format("Hello, ~s!~n", [Name]), true end).

Perform different actions depending on a boolean condition (IF .. THEN .. ELSE)

Given a variable age, if the value is greater than 42 display "You are old", otherwise display "You are young"

ruby

if (age > 42)
puts "You are old"
else
puts "You are young"
end

puts (age>42) ? "You are old" : "You are young"

puts "You are #{age > 42 ? "old" : "young"}"

cpp

if (age > 42) Console::WriteLine("You are old");
else Console::WriteLine("You are young");

Console::WriteLine("You are {0}", (age > 42 ? "old" : "young"));

std::printf("You are %s\n", (age > 42 ? "old" : "young"));

fsharp

if age > 42 then printfn "You are old" else printfn "You are young"

let message = if age > 42 then "old" else "young"
printfn "You are %s" message

erlang

if Age > 42 -> io:format("You are old~n") ; true -> io:format("You are young~n") end.

Message = if Age > 42 -> "old" ; true -> "young" end, io:format("You are ~s~n", [Message]).

case Age > 42 of true -> io:format("You are old~n") ; false -> io:format("You are young~n") end.

case Age of _ when Age > 42 -> io:format("You are old~n") ; _ -> io:format("You are young~n") end.

Message = case Age of _ when Age > 42 -> "old" ; _ -> "young" end, io:format("You are ~s~n", [Message]).

Age > 42 andalso (begin io:format("You are old~n"), true end) orelse (begin io:format("You are young~n"), true end).

(fun (X) when X > 42 -> io:format("You are old~n"); (_) -> io:format("You are young~n") end)(Age).

(fun () when Age > 42 -> io:format("You are old~n"); () -> io:format("You are young~n") end)().

io:format("You are ~s~n", [if Age > 42 -> "old" ; true -> "young" end]).

Perform different actions depending on several boolean conditions (IF .. THEN .. ELSIF .. ELSE)

ruby

if age > 84
puts "You are really ancient"
elsif age > 30
puts "You are middle-aged"
else
puts "You are young"
end

case
when age > 84 then puts "You are really ancient"
when age > 30 then puts "You are middle-aged"
else puts "You are young"
end

cpp

if (age > 84) Console::WriteLine("You are really ancient");
else if (age > 30) Console::WriteLine("You are middle-aged");
else Console::WriteLine("You are young");

Console::WriteLine("You are {0}", (age > 84 ? "really ancient" : age > 30 ? "middle-aged" : "young"));

std::cout << "You are " << (age > 84 ? "really ancient" : age > 30 ? "middle-aged" : "young") << std::endl;

fsharp

if age > 84 then printfn "You are really ancient"
elif age > 30 then printfn "You are middle-aged"
else printfn "You are young"

let message = match age with
| _ when age > 84 -> "really ancient"
| _ when age > 30 -> "middle-aged"
| _ -> "young"
printfn "You are %s" message

erlang

if
Age > 84 -> io:format("You are really ancient~n");
Age > 30 -> io:format("You are middle-aged~n");
true -> io:format("You are young~n")
end.

case Age of
_ when Age > 84 -> io:format("You are really ancient~n");
_ when Age > 30 -> io:format("You are middle-aged~n");
true -> io:format("You are young~n")
end.

Replacing a conditional with many branches with a switch/case statement

Many languages support more compact forms of branching than just if ... then ... else such as switch or case or match. Use such a form to add an appropriate placing suffix to the numbers 1..40, e.g. 1st, 2nd, 3rd, 4th, ..., 11th, 12th, ... 39th, 40th

ruby

def suffixed(number)
last_digit = number.to_s[-1..-1].to_i
suffix = case last_digit
when 1 then 'st'
when 2 then 'nd'
when 3 then 'rd'
else 'th'
end
suffix = 'th' if (11..13).include?(number)
"#{number}#{suffix}"
end

(1..40).each {|n| puts suffixed(n) }

cpp

#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int num,i,x;
cout<<"Enter the range:";
cin>>num;
for(i=1;i<=num;i++)
{
x=i%10;
switch(i)
{
case 11:
case 12:
case 13:cout<<i<<"th ";
continue;
}
switch(x)
{
case 1: cout<<i<<"st ";break;
case 2: cout<<i<<"nd ";break;
case 3: cout<<i<<"rd ";break;
default: cout<<i<<"th ";
}
}
getch();
}

fsharp

let suffix = function
| n when n > 10 && n < 20 -> "th"
| n when n % 10 = 1 -> "st"
| n when n % 10 = 2 -> "nd"
| n when n % 10 = 3 -> "rd"
| _ -> "th"

seq { 1 .. 40 }
|> Seq.iter (fun n -> printfn "%i%s" n (suffix n))

erlang

Suffix = case Num of
N when N > 10, N < 20 -> "th";
N when N rem 10 =:= 1 -> "st";
N when N rem 10 =:= 2 -> "nd";
N when N rem 10 =:= 3 -> "rd";
_ -> "th"
end,
io_lib:format("~w~s", [Num, Suffix])

Loops

Perform an action multiple times based on a boolean condition, checked before the first action (WHILE .. DO)

Starting with a variable x=1, Print the sequence "1,2,4,8,16,32,64,128," by doubling x and checking that x is less than 150.

ruby

x=1
while x < 150
puts x
x <<= 1
end

cpp

int x = 1;

while (x < 150) { x *= 2; Console::Write("{0},", x); }
Console::WriteLine();

for (int x = 1; x < 150; x *= 2) { std::cout << x << ","; }
std::cout << std::endl;

fsharp

let mutable x = 1
while x < 150 do printf "%d, " x ; (x <- x * 2) done

// The problem is clearly geared towards imperative languages ;-)
// No need to mutate any variable, here's how to do it loop-free functional:
let rec powers2 i = seq { if i < 150 then yield i; yield! powers2 (i*2) }
powers2 1 |> Seq.iter (fun i -> printf "%i, " i)

erlang

X = 1, print_while_X_less_150(X).

Pred = fun (X) -> X < 150 end,
Action = fun (X) -> io:format("~B,", [X]), X * 2 end,
X = 1,

while_do(Pred, Action, X).

Perform an action multiple times based on a boolean condition, checked after the first action (DO .. WHILE)

Simulate rolling a die until you get a six. Produce random numbers, printing them until a six is rolled. An example output might be "4,2,1,2,6"

ruby

# Ruby has no DO..WHILE construct. Need to write it as a WHILE
rnd = 0
while (rnd != 6)
rnd = rand(6)+1
print rnd
print "," if (rnd!=6)
end

begin
rnd = rand(6)+1
print rnd
print "," if rnd!=6
end while rnd != 6

# This uses Enumerators, ad it becomes almost functional style...

games = Enumerator.new do |yielder|
yielder.yield rand(6) + 1 while true
end

puts games.take_while {|roll| roll != 6}.join(",")

cpp

Random^ rnd = gcnew Random;

int dice = rnd->Next(1, 7); Console::Write("{0}", dice);
do { Console::Write(",{0}", (dice = rnd->Next(1, 7))); } while (dice != 6);
Console::WriteLine();

fsharp

open System
let rand = Random()

Seq.initInfinite (fun _ -> rand.Next(1, 7))
|> Seq.takeWhile (fun x -> x < 6)
|> fun items -> String.Join(",", items)
|> function s when s = "" -> printfn "6" | s -> printfn "%s,6" s

erlang

Pred = fun (DiceRoll) -> DiceRoll =/= 6 end,
Action = fun (DiceRoll) -> io:format("~B,", [DiceRoll]), dice_roll() end,

do_while(Pred, Action, dice_roll()).

-module(dice).
-export([start/0]).

start() ->
roll(dice_roll()).

roll(6) ->
io:format("6~n", []);
roll(N) ->
io:format("~B,", [N]),
roll(dice_roll()).

dice_roll() -> random:uniform(6).

Perform an action a fixed number of times (FOR)

Display the string "Hello" five times like "HelloHelloHelloHelloHello"

ruby

puts "Hello"*5

5.times { print "Hello" }

cpp

for(int i = 0; i < 5; ++i) Console::Write("Hello");

for(int i = 5; i > 0; --i) Console::Write("Hello");

dotimes(5, hello);

fill_n(ostream_iterator<string>(cout), 5, "Hello");

fsharp

for i = 1 to 5 do printf "Hello" done

dotimes 5 (fun () -> printf "Hello")

// Repetition via ranging over a List type(index ignored)
for _ in list do printf "Hello" done

// Repetition via ranging over a Sequence type(index ignored)
for _ in sequence do printf "Hello" done

// Repetition via ranging over an Array type(index ignored)
for _ in array do printf "Hello" done

erlang

dotimes(5, fun () -> io:format("Hello") end).

lists:foreach(fun (_) -> io:format("Hello") end, lists:seq(1, 5)).

Perform an action a fixed number of times with a counter

Display the string "10 .. 9 .. 8 .. 7 .. 6 .. 5 .. 4 .. 3 .. 2 .. 1 .. Liftoff!"

ruby

10.downto(1) { |n| print n, " .. " }
puts "Liftoff!"

cpp

for(int i = 10; i != 0; --i) Console::Write("{0} .. ", i);
Console::WriteLine("Liftoff!");

fsharp

for i = 10 downto 1 do printf "%d .. " i done
printfn "Liftoff!"

// Repetition via ranging over a Sequence type
for i in {10 .. -1 .. 1} do printf "%d .. " i done ; printfn "Liftoff!"

erlang

fromto(10, 1, -1, fun (X) -> io:format("~B .. ", [X]) end), io:format("Liftoff!~n").

lists:foreach(fun (X) -> io:format("~B .. ", [X]) end, lists:seq(10, 1, -1)), io:format("Liftoff!~n").

Files

Reading

Read the contents of a file into a string

ruby

file = File.new("Solution108.rb")
whole_file = file.read

cpp

IO::FileStream^ file; String^ buffer;

try
{
file = gcnew IO::FileStream("test.txt", IO::FileMode::Open);
buffer = gcnew String((gcnew IO::BinaryReader(file))->ReadChars(file->Length));
}

IO::StreamReader^ stream; String^ buffer;

try
{
stream = gcnew IO::StreamReader("test.txt");
buffer = stream->ReadToEnd();
}

String^ buffer = IO::File::ReadAllText("test.txt");

fsharp

let file = new FileStream("test.txt", FileMode.Open)
let buffer = new String((new BinaryReader(file)).ReadChars(Convert.ToInt32(file.Length)))

let stream = new StreamReader("test.txt")
let buffer = stream.ReadToEnd()

let buffer = File.ReadAllText("test.txt")

erlang

Text = readfile("Solution607.erl"),

Text = readfile("Solution608.erl"),

Process a file one line at a time

Open the source file to your solution and print each line in the file, prefixed by the line number, like:
1> First line of file
2> Second line of file
3> Third line of file

ruby

File.open("Solution103.rb").each_with_index { |line, count|
puts "#{count} > #{line}
}

cpp

IO::StreamReader^ stream; String^ ln; int i = 0;

try
{
stream = gcnew IO::StreamReader("test.txt");
while ((ln = stream->ReadLine())) Console::WriteLine("{0}> {1}", ++i, ln);
}

int i = 0;
for each(String^ line in IO::File::ReadAllLines("test.txt")) Console::WriteLine("{0}> {1}", ++i, line);

fsharp

let stream = new StreamReader("test.txt")
let mutable i = 1
let mutable line = stream.ReadLine()
while (line <> null) do printfn "%d> %s" i line ; line <- stream.ReadLine() ; i <- i + 1 done
stream.Close()

let proc_a_line (filename : string) proc =
let stream = new StreamReader(filename)
let rec proc_a_line' count line =
match line with
| null -> stream.Close()
| _ -> proc count line ; proc_a_line' (count + 1) (stream.ReadLine())
proc_a_line' 1 (stream.ReadLine())

// ------

let _ = proc_a_line "test.txt" (fun i line -> printfn "%d> %s" i line)

let reader(filename : string) = seq {
use sr = new StreamReader(filename)
while not sr.EndOfStream do
let line = sr.ReadLine()
yield line
done
}

// ------

reader("test.txt") |> Seq.iteri (fun i line -> printfn "%d> %s" (i + 1) line)

File.ReadAllLines("test.txt") |> Array.iteri (fun i line -> printfn "%d> %s" (i + 1) line)

// Unlike ReadAllLines, ReadLines (new in .NET 4) only reads the file
// one line at a time, rather than reading the entire file into an array first.

open System.IO
File.ReadLines("test.txt") |> Seq.iteri (fun i line -> printfn "%d> %s" (i + 1) line)

erlang

Reader = fun (IODevice) -> io:get_line(IODevice, "") end,
Worker = fun (Line, N) -> io:format("~B> ~s", [N, Line]), N + 1 end,

while_not_eof("Solution609.erl", Reader, Worker, 1).

Reader = fun (Filename) -> {ok, Contents} = file:read_file(Filename), Contents end,
Transformer = fun (Line, N) -> string:concat(string:concat(integer_to_list(N), "> "), Line) end,
Printer = fun (Line) -> io:format("~s~n", [Line]) end,

Lines = string:tokens(binary_to_list(Reader("Solution610.erl")), "\n"),
NewLines = lists:zipwith(Transformer, Lines, lists:seq(1, length(Lines))),
lists:foreach(Printer, NewLines).

Writing

Write a string to a file

ruby

File.new("a_file", "w") << "some text"

cpp

IO::StreamWriter^ stream;

try
{
stream = gcnew IO::StreamWriter("test.txt", false);
stream->WriteLine("This line overwites file contents!");
}

fsharp

let stream = new StreamWriter("test.txt", false)
stream.WriteLine("This line overwrites file contents!")

erlang

Line = "This line overwites file contents!\n",
{ok, IODevice} = file:open("test.txt", [write]), file:write(IODevice, Line), file:close(IODevice).

Append to a file

ruby

file = File.new('/tmp/test.txt', 'a+') ; file.puts 'This line appended to file!!' ; file.close()

cpp

IO::StreamWriter^ stream;

try
{
stream = gcnew IO::StreamWriter("test.txt", true);
stream->WriteLine("This line appended to file!");
}

fsharp

let stream = new StreamWriter("test.txt", true)
stream.WriteLine("This line appended to file!")

erlang

Line = "This line appended to file!\n",
{ok, IODevice} = file:open("test.txt", [append]), file:write(IODevice, Line), file:close(IODevice).

Directories

Process each file in a directory

ruby

directory = '/tmp' ; Dir.foreach(directory) {|file| puts "#{file}"}

cpp

for each(String^ filename in IO::Directory::GetFiles(dirname)) process(filename);

fsharp

let dirname = "c:\\"

let processFile filename = printfn "%s" filename
for filename in Directory.GetFiles(dirname) do processFile filename done

let dirname = "c:\\"

Directory.GetFiles(dirname) |> Array.iter (fun filename -> printfn "%s" filename)

erlang

% File basenames only - many tasks require absolute paths to work
lists:foreach(fun (FileOrDirPath) -> Worker(FileOrDirPath) end, file:list_dir(Directory)).

% Absolute paths provided - will accomodate most tasks
lists:foreach(fun (FileOrDirPath) -> Worker(FileOrDirPath) end, list_dir_path(Directory)).

Process each file in a directory recursively

ruby

def procdir(dirname)
Dir.foreach(dirname) do |dir|
dirpath = dirname + '/' + dir
if File.directory?(dirpath) then
if dir != '.' && dir != '..' then
puts "DIRECTORY: #{dirpath}" ; procdir(dirpath)
end
else
puts "FILE: #{dirpath}"
end
end
end

# ------

procdir('/tmp')

cpp

void processFile(String^ filename) { Console::WriteLine("{0}", filename); }

void processDirectory(String^ dirname)
{
for each(String^ filename in IO::Directory::GetFiles(dirname)) processFile(filename);
for each(String^ subdirname in IO::Directory::GetDirectories(dirname)) processDirectory(subdirname);
}

int main()
{
processDirectory("c:\\");
}

fsharp

let processDirectory dirname proc =
let rec processDirectory' dirname' =
Directory.GetFiles(dirname') |> Array.iter proc
Directory.GetDirectories(dirname') |> Array.iter processDirectory'
processDirectory' dirname

// ------

let dirname = "c:\\"

processDirectory dirname (fun filename -> printfn "%s" filename)

erlang

filelib:fold_files(Directory, ".*", true, fun (FileOrDirPath, Acc) -> Worker(FileOrDirPath), Acc end, []).

process_dir(Directory, Worker).

Dates

Parsing

Parse a date and time from a string

Given the string "2008-05-06 13:29", parse it as a date representing 6th March, 2008 1:29:00pm in the local time zone.

ruby

# With timezone info
puts Time.parse('2008-05-06 13:29')

cpp

DateTimeOffset^ dateTime = DateTimeOffset::Parse("2008-05-06 13:29");

// Use format specifiers to appropriately format string
// 1. Default culture
Console::WriteLine("{0}", dateTime->ToString("d MMMM, yyyy h:mm:sstt"));

// 2. Nominated culture
Console::WriteLine("{0}", dateTime->ToString("d MMMM, yyyy h:mm:sstt"), Globalization::CultureInfo::CreateSpecificCulture("en-us"));

DateTimeOffset^ dateTime = DateTimeOffset::Parse("2008-05-06 13:29");

// Customize date/time string
Text::StringBuilder^ dsb = gcnew Text::StringBuilder(40);
dsb->Append(dateTime->ToString("%d"))->Append("th ")->Append(dateTime->ToString("MMMM, yyyy h:mm:ss"))->Append(dateTime->ToString("tt")->ToLower());

Console::WriteLine("{0}", dsb);

fsharp

let dateTime = DateTimeOffset.Parse("2008-05-06 13:29")

// Use format specifiers to appropriately format string
// 1. Default culture
printfn "%s" (dateTime.ToString("d MMMM, yyyy h:mm:sstt"))

// 2. Nominated culture
Console.WriteLine("{0}", dateTime.ToString("d MMMM, yyyy h:mm:sstt"), Globalization.CultureInfo.CreateSpecificCulture("en-us"))

let dateTime = DateTimeOffset.Parse("2008-05-06 13:29")

// Customize date/time string
let dsb = ((new StringBuilder(40)).Append(dateTime.ToString("%d")).Append("th ").Append(dateTime.ToString("MMMM, yyyy h:mm:ss")).Append(dateTime.ToString("tt").ToLower()))

printfn "%s" (dsb.ToString())

erlang

% AFAIK, no datetime-parsing library exists; 'parse_to_datetime' is a simplistic, problem-specific hack
LocalDateTime = erlang:universaltime_to_localtime(parse_to_datetime("2008-05-06 13:29:34")),

Printing

Display information about a date

Display the day of month, day of year, month name and day name of the day 8 days from now.

ruby

require 'date'

next_week = Date.today + 8

puts next_week.day # day of month
puts next_week.yday # day of year
puts next_week.strftime('%B') # month name
puts next_week.strftime('%A') # day name

cpp

QDate dateEightDaysFromNow = QDate::currentDate().addDays(8);

fsharp

Using F# interactive

> let Then = DateTime.Now.AddDays(8.0)
- let dayNumber = Then.DayOfYear.ToString()
- let solution = Then.ToString("dd " + dayNumber + " MMMM dddd");;

val Then : DateTime = 08/08/2010 08:58:05
val dayNumber : string = "220"
val solution : string = "08 220 August Sunday"

>

Display a date in different locales

Display a language/locale friendly version of New Year's Day for 2009 for several languages/locales. E.g. for languages English, French, German, Italian, Dutch the output might be something like:

Thursday, January 1, 2009
jeudi 1 janvier 2009
giovedì 1 gennaio 2009
Donnerstag, 1. Januar 2009
donderdag 1 januari 2009

(Indicate in comments where possible if any language specific or operating system configuration needs to be in place.)

cpp

QList<QLocale::Language> locales;
locales << QLocale::English
<< QLocale::French
<< QLocale::German
<< QLocale::Italian
<< QLocale::Dutch;

QDate date(2009, 1, 1);
foreach (QLocale::Language ll, locales)
{
QLocale::setDefault(ll);
qDebug() << date.toString(Qt::DefaultLocaleLongDate);
}

fsharp

open System
open System.Globalization

let jan1 = DateTime(2009, 1, 1)

[ "en-US"; "fr-FR"; "de-DE"; "it-IT"; "nl-NL" ]
|> List.map CultureInfo.CreateSpecificCulture
|> List.map (fun c -> jan1.ToString("D", c))
|> List.iter (printfn "%s")

Creation

Display the current date and time

Create a Date object representing the current date and time. Print it out.
If you can also do this without creating a Date object you can show that too.

ruby

puts DateTime.now

cpp

QDate now = QDate::currentData();
qDebug() << now.toString();

time_t date = time(0);
cout << ctime(&date);

fsharp

printfn "%A" System.DateTime.Now

erlang

io:format("~p~n", [calendar:local_time()])

OOP

Basics

Define a class

Declare a class named Greeter that takes a string on creation and greets using this string if you call the "greet" method.

ruby

class Greeter
def initialize(whom) @whom = whom end
def greet() puts "Hello, #{@whom}!" end
end

(Greeter.new("world")).greet()

cpp

class Greeter
{
public:
Greeter(const std::string& whom);
void greet() const;

private:
std::string whom;
};

int main()
{
Greeter* gp = new Greeter("world");
gp->greet();
delete gp;
}

Greeter::Greeter(const std::string& whom) : whom(whom) {}

void Greeter::greet() const
{
std::cout << "Hello, " << whom << std::endl;
}

public ref class Greeter
{
public:
Greeter(String^ whom);
void greet();

private:
initonly String^ whom;
};

int main()
{
(gcnew Greeter(L"world"))->greet();
}

Greeter::Greeter(String^ whom) : whom(whom) {}

void Greeter::greet()
{
Console::WriteLine(L"Hello, {0}", whom);
}

fsharp

type Greeter(whom' : string) =
member this.greet() = printfn "Hello, %s!" whom'

(new Greeter("world")).greet()

type Greeter(whom' : string) =
let whom : string = whom'
member this.greet() = printfn "Hello, %s!" whom

(new Greeter("world")).greet()

type Greeter =
class
val whom : string
new(whom') = { whom = whom' }
member this.greet() = printfn "Hello, %s!" this.whom
end

(new Greeter("world")).greet()

erlang

Greeter = make_greeter("world!"),
Greeter(greet).

Instantiate object with mutable state

Reimplement the Greeter class so that the 'whom' property or data member remains private but is mutable, and is provided with getter and setter methods. Invoke the setter to change the greetee, invoke 'greet', then use the getter in displaying the line, "I have just greeted {whom}.".

For example, if the greetee is changed to 'Tommy' using the setter, the 'greet' method would display:

Hello, Tommy!

The getter would then be used to display the line:

I have just greeted Tommy.

ruby

class Greeter
attr_accessor :whom
def initialize(whom) @whom = whom end
def greet() puts "Hello, #{@whom}!" end
end

greeter = Greeter.new("world") ; greeter.greet()

greeter.whom = 'Tommy' ; greeter.greet()
puts "I have just greeted %s" % greeter.whom

cpp

#include <iostream>

using namespace std;

class Greeter {
string whom_;

public:
Greeter(const string &whom) : whom_(whom) {}

string get_whom() const {
return whom_;
}

void set_whom(const string &whom) {
whom_ = whom;
}

void greet() const {
cout << "Hello " << whom_ << "!" << endl;
}
};

int main()
{
Greeter greeter("world");
greeter.greet();
greeter.set_whom("Tommy");
greeter.greet();
cout << "I have just greeted " + greeter.get_whom() << "." << endl;
}

fsharp

type Greeter(name:string) =
let mutable whom = name

member this.Whom
with get () = whom
and set v = whom <- v

member this.Greet() =
printfn "Hello, %s!" whom

let greeter = Greeter("World")
greeter.Greet()
greeter.Whom <- "Tommy"
greeter.Greet()
printfn "I have just greeted %s." greeter.Whom

Inheritance

Implement Inheritance Heirarchy

Implement a Shape abstract class which will form the base of an inheritance hierarchy that models 2D geometric shapes. It will have:

* A non-mutable 'name' property or data member set by derived or descendant classes at construction time
* A 'area' method intended to be overridden by derived or descendant classes ( double precision floating point return value)
* A 'print' method (also for overriding) will display the shape

's name, area, and all shape-specific values



Two derived or descendant classes will be created:

* Circle    -> Constructor requires a '

radius' argument, and a 'circumference

' method to be implemented  

* Rectangle -> Constructor requires '

length' and 'breadth' arguments, and a 'perimeter

' method to be implemented 



Instantiate an object of each class, and invoke each objects '

print' method to show relevant details.

ruby

class Shape
def initialize(name="") @name = name end
end

class Circle < Shape
def initialize(radius) super("circle") ; @radius = radius end

def area() 3.14159 * @radius * @radius end
def circumference() 2 * 3.14159 * @radius end

def print()
puts "I am a #{@name} with ->"
puts "Radius: %.2f" % @radius
puts "Area: %.2f" % self.area()
puts "Circumference: %.2f\n" % self.circumference()
end

end

class Rectangle < Shape
def initialize(length, breadth) super("rectangle") ; @length = length ; @breadth = breadth end

def area() @length * @breadth end
def perimeter() 2 * @length + 2 * @breadth end

def print()
puts "I am a #{@name} with ->"
printf("Length, Width: %.2f, %.2f\n", @length, @breadth)
puts "Area: %.2f" % self.area()
puts "Perimeter: %.2f\n" % self.perimeter()
end
end

# ------

shapes = [Circle.new(4.2), Rectangle.new(2.7, 3.1), Rectangle.new(6.2, 2.6), Circle.new(17.3)]
shapes.each {|shape| shape.print}

cpp

#include <string>
#include <iostream>

using namespace std;

static const double PI = 3.141592;

class Shape {
protected:
string name_;
public:
Shape(const string& name) : name_(name) { }
virtual double area() const = 0;
virtual void print() const = 0;
};

class Circle : public Shape {
double radius_;
public:
Circle(double radius) : Shape("circle"), radius_(radius) { }
double area() const {
return PI * radius_ * radius_;
}
void print() const {
cout << "A " << name_ << " with radius " << radius_ << ", area "
<< area() << " and circumference " << circumference() << "."
<< endl;
}
double circumference() const {
return 2 * PI * radius_;
}
};

class Rectangle : public Shape {
double length_;
double breadth_;
public:
Rectangle(double length, double breadth) :
Shape("rectangle"), length_(length), breadth_(breadth) { }
double area() const {
return length_ * breadth_;
}
void print() const {
cout << "A " << name_ << " with length " << length_ << ", breadth "
<< breadth_ << ", area " << area() << " and perimeter "
<< perimeter() << "." << endl;
}
double perimeter() const {
return 2 * length_ + 2 * breadth_;
}
};

int main(int argc, char *argv[])
{
Circle circle(4);
circle.print();
Rectangle rectangle(2, 5.5);
rectangle.print();
}

fsharp

[<AbstractClass>]
type Shape(name:string) =
member this.Name = name
abstract Area : float
abstract Print : unit -> unit

type Circle(name, radius:float) =
inherit Shape(name)
member this.Radius = radius
member this.Circumference =
System.Math.PI * radius * 2.
override this.Area =
System.Math.PI * radius * radius
override this.Print() =
printfn "Circle: %s" this.Name
printfn "Area: %f" this.Area
printfn "Circumference: %f" this.Circumference
printfn "Radius: %f" this.Radius

type Rectangle(name, length:float, breadth:float) =
inherit Shape(name)
member this.Length = length
member this.Breadth = breadth
member this.Perimiter =
(length * 2.) + (breadth * 2.)
override this.Area =
length * breadth
override this.Print() =
printfn "Rectangle: %s" this.Name
printfn "Area: %f" this.Area
printfn "Perimiter: %f" this.Perimiter
printfn "Length: %f" this.Length
printfn "Breadth: %f" this.Breadth

let c = Circle("Foo", 2.1)
let r = Rectangle("Bar", 2.2, 3.3)

c.Print()
printfn ""
r.Print()

Implement and use an Interface

Create a Serializable interface consisting of 'save' and 'restore' methods, each of which:

* Accept a stream or handle or descriptor argument for the source or destination
* Save to destination or restore from source the properties or data members of the implementing class (restrict yourself to the primitive types 'int' and 'string')

Next, create a Person class which has 'name' and 'age' properties or data members and implements this interface. Instantiate a Person object, save it to a serial stream, and instantiate a new Person object by restoring it from the serial stream.

ruby

class Person
def initialize(name, age)
@name, @age = name, age
end
end

tom = Person.new("Tom Bones", 23)

File.open('tommy.dump', 'w+') {|f| f.write(Marshal.dump(tommy)) }
toms_clone = Marshal.load(File.read('tommy.dump'))

cpp

struct person
{
person(){}
person(const string &name, int age) : name_(name), age_(age) {}

string name_;
int age_;

template<typename Archive>
void serialize(Archive &ar, const unsigned int version) {
ar & name_ & age_;
}
};

int main()
{
const char *fn = "filename.txt";

person k("Ken", 38);
{
ofstream ofs(fn);
archive::text_oarchive oa(ofs);
oa << k;
}

person restored_person;
{
ifstream ifs(fn);
archive::text_iarchive ia(ifs);
ia >> restored_person;
}

cout << "Name : " << restored_person.name_ << endl
<< "Age : " << restored_person.age_ << endl;
}

fsharp

// Since everyone else is using built-in functionality instead of
// defining an interface as required, I won't buck the trend.
// Maybe this problem should be named "Use serialization features" instead
// of "Implement and use an Interface"

open System
open System.IO
open System.Runtime.Serialization.Formatters.Binary

[<Serializable>]
type Person(name:string, age:int) =
member this.Name = name
member this.Age = age

let serialize x =
use ms = new MemoryStream()
let bf = new BinaryFormatter()
bf.Serialize(ms, x)
ms.ToArray()

let deserialize<'a> bytes =
use ms = new MemoryStream(bytes:byte[])
let bf = new BinaryFormatter()
bf.Deserialize(ms) :?> 'a

let before = Person("Joel", 35)
let bytes = serialize before
let after = deserialize<Person> bytes

printfn "Before: %s, %i" before.Name before.Age
printfn "After: %s, %i" after.Name after.Age

Networking

HTTP

Check your language appears on the langref.org site

Your language name should appear within the HTML found at the http://langreg.org main page.

ruby

Net::HTTP.start(URL, 80) do |http|
status = if http.get('/').body =~ /#{SRCHEXP}/ then "offers" else "does not offer" end
puts "http:\/\/#{URL} #{status} #{LANGUAGE}"
end

cpp

HttpWebRequest^ httpReq = safe_cast<HttpWebRequest^>(WebRequest::Create(url)); httpReq->KeepAlive = false;
StreamReader^ httpStream = gcnew StreamReader(httpReq->GetResponse()->GetResponseStream());
String^ htmlPage = httpStream->ReadToEnd(); httpStream->Close();

Console::WriteLine("{0} {1} {2}", url, (htmlPage->IndexOf(url + language) > 0 ? "offers" : "does not offer"), language);

fsharp

let httpReq = (WebRequest.Create(url) :?> HttpWebRequest)
httpReq.KeepAlive <- false
let httpStream = new StreamReader(httpReq.GetResponse().GetResponseStream())
let htmlPage = httpStream.ReadToEnd()
httpStream.Close()

let offerStatus = (if (htmlPage.IndexOf(url ^ language) > 0) then "offers" ; else "does not offer")
Console.WriteLine("{0} {1} {2}", url, offerStatus, language)

erlang

URL = "http://langref.org/", Language = "erlang", Regexp = ".*" ++ URL ++ Language ++ ".*",

case http:request(URL) of
{ok, {_, _, Body}} ->
case regexp:first_match(Body, Regexp) of
{match, _, _} -> io:format("Language ~s exists @ ~s~n", [Language, URL]);
_ -> false
end;
{error, ErrorInfo} -> throw("Error: " ++ http:format_error(ErrorInfo))
end,

SMTP

Send an email

Use library functions, classes or objects to create a short email addressed to your own email address. The subject should be, "Greetings from langref.org", and the user should be prompted for the message body, and whether to cancel or proceed with sending the email.

ruby

require 'net/smtp'
require 'webrick/utils'

body = <<END_OF_MESSAGE
This is a message from langref.org
END_OF_MESSAGE

SMTPSRV = 'smtp.somewhere.com'
USER = 'me' ; DOMAIN = 'somewhere.com' ; FROM = USER + '@' + DOMAIN
TO = 'dest@somewhereelse.com'
SUBJECT = 'Greetings from langref.org'
DATE = Time.now.rfc2822()
MSGID = '<' + WEBrick::Utils.random_string(21) + '.' + WEBrick::Utils.random_string(21) + '@' + SMTPSRV + '>'

Net::SMTP.start(SMTPSRV, 25) do |smtp|
smtp.open_message_stream(FROM, [TO]) do |msg|
msg.puts "From: #{FROM}"
msg.puts "To: #{TO}"
msg.puts "Subject: #{SUBJECT}"
msg.puts "Date: #{DATE}"
msg.puts "Message-ID: #{MSGID}"
msg.puts
msg.puts body
end
end

fsharp

open System
open System.Net
open System.Net.Mail
open System.Net.Mime

let subject = "Greetings from langref.org"
let from = "username@gmail.com"
let destination = "username@gmail.com"

printfn "Write mail body (press 'Enter' when finished):"
let mutable body = Console.ReadLine()
if body = null || body.Length = 0 then
body <- "Hello World"

let mail = new MailMessage(from, destination, subject, body)

let smtpHost = "smtp.gmail.com"
let clientCredentials = new NetworkCredential("username@gmail.com", "password")
let smtpClient = new SmtpClient(smtpHost,587)
smtpClient.EnableSsl <- true
smtpClient.UseDefaultCredentials <- false
smtpClient.Credentials <- clientCredentials

printfn "Send email? y/n"
match Console.ReadLine() with
| "y" -> smtpClient.Send(mail);mail.Dispose();printfn "email delivered"
| "n" -> smtpClient.Dispose()
| _ -> smtpClient.Dispose()

XML

Parsing

Process an XML document

Given the XML Document:

<shopping>
<item name="bread" quantity="3" price="2.50"/>
<item name="milk" quantity="2" price="3.50"/>
</shopping>

Print out the total cost of the items, e.g. $14.50

ruby

#!/usr/bin/env ruby

# needed to parse xml
require 'rexml/document'

# grab the file
file = File.new('shop.xml')

# load it as an xml document
doc = REXML::Document.new(file)

# initialize the total to 0 as a float
total = 0.0

# cycle through the items
doc.elements.each('shopping/item') do |item|

# add the price to the total
total += item.attributes['price'].to_f
end

# round the total to the nearest 0.01
total = (total*100.0).round/100.0

# pad the output with the proper number of trailing 0's
printf "$%.2f\n", total

cpp

char input[] =
"<shopping>"
" <item name=\"bread\" quantity=\"3\" price=\"2.50\"/>"
" <item name=\"milk\" quantity=\"2\" price=\"3.50\"/>"
"</shopping>";

xml_document<> doc;
doc.parse<0>(input);
xml_node<> *shopping = doc.first_node();

float total_price = 0;
for (xml_node<> *item = shopping->first_node(); item != NULL; item = item->next_sibling())
{
float item_sum = 0;
float val;

if (string(item->name()) != "item")
continue;

for (xml_attribute<> *attr = item->first_attribute(); attr != NULL; attr = attr->next_attribute())
{
string name(attr->name());
if (name == "quantity" || name == "price")
{
stringstream v(attr->value());
v >> val;
if (item_sum)
item_sum *= val;
else
item_sum = val;
}
}
total_price += item_sum;
}

cout.setf(ios::fixed, ios::floatfield);
cout << "Total price is $" << setprecision(2) << total_price << endl;

fsharp

#r @"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.5\System.Xml.Linq.dll"

open System
open System.Xml.Linq
//XElement Helper
let xname sname = XName.Get sname

let xmlsnippet =
let snippet = new XElement(xname "shopping")
//create bread
let bread = new XElement(xname "item")
bread.SetAttributeValue(xname "name","bread")
bread.SetAttributeValue(xname "quantity",3)
bread.SetAttributeValue(xname "price",2.50)
//add bread to snippet
snippet.Add(bread)
//create milk
let milk = new XElement(xname "item")
milk.SetAttributeValue(xname "name","milk")
milk.SetAttributeValue(xname "quantity",2)
milk.SetAttributeValue(xname "price",3.50)
//add milk to snippet
snippet.Add(milk)
snippet

let totalprice (xe: XElement) =
xe.Descendants(xname "item")
|> Seq.map(fun i -> Double.Parse(i.Attribute(xname "price").Value))
|> Seq.fold(fun acc x -> acc + x) 0.0

let xname sname = XName.Get sname
let xattr (elem: XElement) sname = elem.Attribute(xname sname).Value
let xml = XDocument.Load("xml.txt")

let shoppingCost =
xml.Descendants(xname "item")
|> Seq.map (fun i -> Double.Parse(xattr i "quantity"), Double.Parse(xattr i "price"))
|> Seq.sumBy (fun (quantity, price) -> quantity * price)

// Alternative solution that uses XML Navigation, and XPath expressions to ensure that
// the items have the required attributes
let xname sname = XName.Get sname
let xattr (elem: XElement) sname = elem.Attribute(xname sname).Value

let navigator = XPathDocument("xml.txt").CreateNavigator()
let path = XPathExpression.Compile("/shopping/item[@price][@quantity]")
let names = XmlNamespaceManager(navigator.NameTable)
path.SetContext(names)
let shoppingCost =
match path.ReturnType with
| XPathResultType.NodeSet ->
navigator.Select(path)
|> Seq.cast
|> Seq.map (fun (i: XPathNavigator) ->
if i.IsNode then
let elem = XElement.Parse(i.OuterXml)
Double.Parse(xattr elem "quantity"), Double.Parse(xattr elem "price")
else
failwith "Error in expression, expecting to see a node"
)
|> Seq.sumBy (fun (quantity, price) -> quantity * price)
| _ -> failwith "Error in expression, expecting to see a node set"

erlang

-include_lib("xmerl/include/xmerl.hrl").
-export([get_total/1]).

get_total(ShoppingList) ->
{XmlElt, _} = xmerl_scan:string(ShoppingList),
Items = xmerl_xpath:string("/shopping/item", XmlElt),
Total = lists:foldl(fun(Item, Tot) ->
[#xmlAttribute{value = PriceString}] = xmerl_xpath:string("/item/@price", Item),
{Price, _} = string:to_float(PriceString),
[#xmlAttribute{value = QuantityString}] = xmerl_xpath:string("/item/@quantity", Item),
{Quantity, _} = string:to_integer(QuantityString),
Tot + Price*Quantity
end,
0, Items),
io:format("$~.2f~n", [Total]).

Creation

create some XML programmatically

Given the following CSV:

bread,3,2.50
milk,2,3.50

Produce the equivalent information in XML, e.g.:

<shopping>
<item name="bread" quantity="3" price="2.50" />
<item name="milk" quantity="2" price="3.50" />
</shopping>

ruby

# gem install builder
require 'builder'

xml = Builder::XmlMarkup.new
xml.shopping do
xml.item(:name => "bread", :quantity => 3, :price => "2.50")
xml.item(:name => "milk", :quantity => 2, :price => "3.50")
end
xml

cpp

string input("bread,3,2.50\nmilk,2,3.50\n");

tokenizer<char_separator<char> > tokens(input, char_separator<char>(", \n"));
tokenizer<char_separator<char> >::iterator it = tokens.begin();

xml_document<> doc;
xml_node<> *shopping = doc.allocate_node(node_element, "shopping");
doc.append_node(shopping);

while (it != tokens.end()) {
xml_node<> *item = doc.allocate_node(node_element, "item");
shopping->append_node(item);

item->append_attribute(doc.allocate_attribute("name", doc.allocate_string((*it++).c_str())));
item->append_attribute(doc.allocate_attribute("quantity", doc.allocate_string((*it++).c_str())));
item->append_attribute(doc.allocate_attribute("price", doc.allocate_string((*it++).c_str())));
}

cout << doc << endl;

fsharp

#r "System.Xml.dll"
#r "System.Xml.Linq.dll"

open System
open System.Xml
open System.Xml.Linq

let data = "bread,3,2.50
milk,2,3.50"

let X name =
XName.Get(name)

let lines = data.Split( [|"\n" |], StringSplitOptions.RemoveEmptyEntries)

let document = new XDocument()
let element = new XElement(X "shopping")
document.Add(element)

lines
|> Seq.iter (fun line ->
let items = line.Split([|','|])
let item = new XElement(X "item",
new XAttribute(X "name", items.[0]),
new XAttribute(X "quantity", items.[1]),
new XAttribute(X "price", items.[2]))
element.Add(item))

let output = document.ToString();;

erlang

to_xml(ShoppingList) ->
Items = lists:map(fun(L) ->
[Name, Quantity, Price] = string:tokens(L, ","),
{item, [{name, Name}, {quantity, Quantity}, {price, Price}], []}
end, string:tokens(ShoppingList, "\n")),
xmerl:export_simple([{shopping, [], Items}], xmerl_xml).

Algorithms

Geometry

Find all Pythagorean triangles with length or height less than or equal to 20

Pythagorean triangles are right angle triangles whose sides comply with the following equation:

a * a + b * b = c * c

where c represents the length of the hypotenuse, and a and b represent the lengths of the other two sides. Find all such triangles where a, b and c are non-zero integers with a and b less than or equal to 20. Sort your results by the size of the hypotenuse. The expected answer is:

[3, 4, 5]
[6, 8, 10]
[5, 12, 13]
[9, 12, 15]
[8, 15, 17]
[12, 16, 20]
[15, 20, 25]

ruby

results=[]

1.upto(20) do |a|
1.upto(20) do |b|
c=Math.sqrt(a**2+b**2)
results<<[a, b, c.to_i] if c.to_i==c && !results.index([b, a, c.to_i])
end
end

results=results.sort_by{|r| r[2]}

puts results

def find_pythag( max=20 )
r = []
1.upto max do |n|
n.upto max do |m|
h = Math.sqrt( n**2 + m**2)
r << [n,m,h.to_i] if (h.round - h).zero?
end
end
r.sort_by { |a| a[2] }
end

cpp

vector<solution> solutions;

for (int a = 1; a <= 20; ++a)
for (int b = a + 1; b <= 20; ++b)
{
int c_squared = a*a + b*b;
int c = b + 1;
while (c * c < c_squared)
++c;
if (c * c == c_squared)
solutions.push_back(make_tuple(a, b, c));
}

sort(begin(solutions), end(solutions),
[](const solution& s1, const solution& s2) { return get<2>(s1) < get<2>(s2); });

for (const auto &s: solutions)
cout << '[' << get<0>(s) << ", " << get<1>(s) << ", " << get<2>(s) << ']' << endl;

fsharp

let getGoodTri (a,b) =
let h = int(System.Math.Sqrt(float(a*a + b*b)))
if a*a + b*b = h*h then Some(a,b,h)
else None

seq{ for i in 1..20 do yield! seq{for j in i..20 do yield i,j} } |> Seq.choose(getGoodTri) |> Seq.sortBy(fun (_,_,c) -> c);;

erlang

find_all_pythagorean_triangles(L) ->
lists:sort(fun({_, _, H1}, {_, _, H2}) -> H1 =< H2 end,
[ { X, Y, Z } ||
X <- lists:seq(1,L),
Y <- lists:seq(1,L),
Z <- lists:seq(1,2*L),
X*X + Y*Y =:= Z*Z,
Y > X,
Z > Y
]).

main(_) ->
List = find_all_pythagorean_triangles(20).

Arithmetic

Greatest Common Divisor

Find the largest positive integer that divides two given numbers without a remainder. For example, the GCD of 8 and 12 is 4.

ruby

135.gcd(30)
# => 15

cpp

#include <iostream>
#include <cstdlib>
#include <algorithm>

using namespace std;

int gcd_recursive(int i, int j) {
if (min(i, j) == 0)
return max(i, j);
else
return gcd_recursive(min(i, j), abs(i - j));
}

int gcd_recursive2(int x, int y) {
if (y == 0)
return x;
else
return gcd_recursive2(y, (x % y));
}

int gcd_iterative(int i, int j) {
while (min(i, j) != 0) {
i = min(i, j);
j = abs(i - j);
}
return max(i, j);
}

int main() {
std::cout << gcd_recursive(8, 12) << std::endl;
std::cout << gcd_recursive2(8, 12) << std::endl;
std::cout << gcd_iterative(8, 12) << std::endl;
return 0;
}

fsharp

let rec gcd x y =
if y = 0 then x
else gcd y (x % y)

erlang

-module(gcd).
-export([gcd/2]).

gcd(A, 0) -> A;
gcd(A, B) -> gcd(B, A rem B).

Misc

Fun

produces a copy of its own source code

In computing, a quine is a computer program which produces a copy of its own source code as its only output.

ruby

eval s=%q(puts"eval s=%q(#{s})")

x="x=%p;puts x%%x";puts x%x

cpp

#include <cstdio>
#define B(x) x; printf("{ B(" #x ") }\n");
int main()
{ B(printf("#include <cstdio>\n#define B(x) x; printf(\"{ B(\" #x \") }\\n\");\nint main()\n")) }

fsharp

(fun s -> printf "%s %s" s s) "(fun s -> printf \"%s %s\" s s)"

Parallel

Pool of Workers

Subdivide A Problem To A Pool Of Workers (No Shared Data)

ruby

array, threads, answers = ["ab", "we", "tfe", "aoj"], [], []
array.each { |word|
threads << Thread.new(word.split '' ) do |x|
answer = []
x.each { |a|
answer << a
x.each { |b| answer << [a, b].join }
}
answers << answer
end
}
threads.each {|thr| thr.join}
answers

cpp

vector<string> input;
input.push_back("ab");
input.push_back("we");
input.push_back("tfe");
input.push_back("aoj");

// Make the capacity for 'output' the same as 'input'
vector<set<string> > output(input.size());
#pragma omp parallel for
for (int i = 0; i < input.size(); ++i) {
set<string> perms;
generate_perms(input[i], perms);
#pragma omp critical
// Must use operator[]() and not push_back() since this line
// might be called in any order with respect to 'i'
output[i] = perms;
}

cout << output << endl;

fsharp

open System
let input = [| "ab"; "we"; "tfe"; "aoj" |]

/// Computes all permutations of an array
let rec permute = function
| [| |] -> [| [| |] |]
| a ->
a
|> Array.mapi (fun i ai ->
// Take all elements in the array apart from the i.th, compute
// their permutations, then attach element i at the front of each perm
Array.sub a 0 i
|> Array.append (Array.sub a (i + 1) (a.Length - i - 1))
|> permute
|> Array.map (fun perm -> Array.append [| ai |] perm)
)
|> Array.concat

/// Computes all permutations of a string
let permuteString (s: string) =
s.ToCharArray()
|> permute
|> Array.map (fun p -> new String(p))

let output =
input
|> Array.map (fun word -> async { return (permuteString word) })
|> Async.Parallel
|> Async.RunSynchronously

// like the Java and Groovy solutions, does not duplicate letters
open System
open System.Threading.Tasks

let input = [| "ab"; "we"; "tfe"; "aoj" |]

let factorial n =
seq { 1 .. n } |> Seq.reduce (*)

let swap (arr:'a[]) i j =
[| for k = 0 to arr.Length - 1 do
yield if k = i then arr.[j] elif k = j then arr.[i] else arr.[k] |]

let rec permutation (k:int,j:int) (r:'a[]) =
if j = (r.Length + 1) then r
else permutation (k/j+1, j+1) (swap r (j-1) (k%j))

let permutations (source:'a[]) = seq {
for k = 0 to (factorial source.Length) - 1 do
yield permutation (k,2) source
}

let permute (word:string) =
let letters = word.ToCharArray()
permutations letters
|> Seq.map (fun chars -> String(chars))
|> Array.ofSeq

let tasks =
input |> Array.map (fun word -> Task.Factory.StartNew(fun () -> permute word))

let taskResult (t:Task<_>) =
t.Result

let output = Task.Factory.ContinueWhenAll(tasks, fun ts -> Array.map taskResult ts).Result

Subdivide A Problem To A Pool Of Workers (Shared Data)

Take a hard to compute problem and split it up between multiple worker threads. In your solution, try to fully utilize available cores or processors. (I'm looking at you, Python!)

Note: In this question, there should be a need for shared state between worker threads while the problem is being solved.

Example:

-Conway Game of Life-

From Wikipedia:

The universe of the Game of Life is an infinite two-dimensional orthogonal grid of square cells, each of which is in one of two possible states, live or dead. Every cell interacts with its eight neighbors, which are the cells that are directly horizontally, vertically, or diagonally adjacent. At each step in time, the following transitions occur:

1. Any live cell with fewer than two live neighbours dies, as if caused by underpopulation.
2. Any live cell with more than three live neighbours dies, as if by overcrowding.
3. Any live cell with two or three live neighbours lives on to the next generation.
4. Any dead cell with exactly three live neighbours becomes a live cell.

The initial pattern constitutes the seed of the system. The first generation is created by applying the above rules simultaneously to every cell in the seed—births and deaths happen simultaneously, and the discrete moment at which this happens is sometimes called a tick (in other words, each generation is a pure function of the one before). The rules continue to be applied repeatedly to create further generations.

--However, for our purposes, we will assign a size to the game "board": 2^k * 2^k . That is, the board should be easy to subdivide.

Notice that in this problem, at each step or "tick", each thread/process will need to share data with its neighborhood.

fsharp

/// Represents a single cell, along with the basic transition rule
type State =
| Alive
| Dead
member this.Transition numLiveNeighbors =
match this with
| Alive when numLiveNeighbors < 2 -> Dead
| Alive when numLiveNeighbors > 3 -> Dead
| Alive -> Alive
| Dead when numLiveNeighbors = 3 -> Alive
| _ -> Dead
member this.ToChar() =
match this with
| Alive -> '*'
| Dead -> ' '
static member OfChar = function
| ' ' -> Dead
| _ -> Alive

type Board (board: State[,]) =
member this.Item
with get(i,j) = board.[i,j]
and set (i,j) v = board.[i,j] <- v
member this.Length1 = Array2D.length1 board
member this.Length2 = Array2D.length2 board
member this.CountLiveNeighbors(i, j) =
[| (-1,-1); (-1,0); (-1,1); (0,-1); (0,1); (1,-1); (1,0); (1,1) |]
|> Array.sumBy (fun (di,dj) ->
if (i + di) > 0 && (i + di) < this.Length1 && (j+dj) > 0 && (j+dj) < this.Length2 then
match board.[i+di,j+dj] with
| Alive -> 1
| _ -> 0
else
0
)
member this.Clone() = Board(Array2D.copy board)
override this.ToString() =
[|
for i in 0 .. this.Length1 - 1 do
let l = [| for j in 0 .. this.Length2 - 1 do yield board.[i,j].ToChar() |]
yield new String(l)
|]
|> String.concat ("\n")
static member OfString (s: string) =
let states =
s.Split('\n')
|> Array.map (fun line -> line.ToCharArray() |> Array.map State.OfChar)
Board (Array2D.init states.Length states.[0].Length (fun i j -> states.[i].[j]))
static member Update (inboard: Board) =
let outboard = inboard.Clone()
let Worker (i1,i2,j1,j2) =
for i in i1 .. i2 do
for j in j1 .. j2 do
outboard.[i,j] <-
inboard.CountLiveNeighbors(i, j)
|> inboard.[i,j].Transition
let N1 = inboard.Length1 / 2
let N2 = inboard.Length2 / 2
[| (0,N1,0,N2); (N1+1,inboard.Length1-1,0,N2); (0,N1,N2+1,inboard.Length2-1); (N1+1,inboard.Length1-1,N2+1,inboard.Length2-1) |]
|> Array.map (fun bounds -> async { Worker bounds})
|> Async.Parallel
|> Async.RunSynchronously
|> ignore
outboard

let blinker = " \n * \n * \n * \n " |> Board.OfString

do
let after1cycles =
blinker
|> Board.Update
let after3cycles =
after1cycles
|> Board.Update
|> Board.Update
printfn "%s" (after3cycles.ToString())

Threads

Create a multithreaded "Hello World"

Create a program which outputs the string "Hello World" to the console, multiple times, using separate threads or processes.

Example:

-Output-

Thread one says Hello World!
Thread two says Hello World!
Thread four says Hello World!
Thread three says Hello World!

-Notice that the threads can print in any order.

ruby

%w[one two three four].each do |number|
Thread.new(number) { |number|
puts "Thread #{number} says Hello World!"
}.join
end

cpp

#include <iostream>
#include <string>

using namespace std;

int main(){
int pid;
string text[4]={"one","two","three","four"};
for (int i=0;i<4;i++){
pid=fork();
if (pid>0){
//cout << "Process("<<pid<<") - " << "Thread " << text[i] << " says Hello World!" << endl;
cout << "Thread " << text[i] << " says Hello World!" << endl;
exit(0);
}
}
return 0;
}

#include <iostream>
#include <string>

#include <omp.h>

int main() {
unsigned int const num_threads = 4;

std::string const names[] = { "one", "two", "three", "four" };

# pragma omp parallel num_threads(num_threads)
{
unsigned const id = omp_get_thread_num();
// Stream concatenation isn't thread-safe so we use a critical section.
# pragma omp critical
std::cout << "Thread " << names[id] << " says Hello World!" << std::endl;
}
}

fsharp

let mappedString =
["Thread one says Hello World!";
"Thread two says Hello World!";
"Thread four says Hello World!";
"Thread three says Hello World!"]
|> Seq.map (fun str -> async { printfn "%s" str })

Async.RunSynchronously (Async.Parallel mappedString)

erlang

-module(spam).
-export([spam/1]).

spam(N) when N<5 ->
spawn(fun() -> io:format("Hello World from thread ~p~n",[N]) end),
spam(N+1);
spam(_) -> void.

Create read/write lock on a shared resource.

Create multiple threads or processes who are either readers or writers. There should be more readers then writers.

(From Wikipedia):

Multiple readers can read the data in parallel but an exclusive lock is needed while writing the data. When a writer is writing the data, readers will be blocked until the writer is finished writing.

Example:

-Output-

Thread one says that the value is 8.
Thread three says that the value is 8.
Thread two is taking the lock.
Thread four tried to read the value, but could not.
Thread five tried to write to the value, but could not.
Thread two is changing the value to 9.
Thread two is releasing the lock.
Thread four says that the value is 9.
...

--Notice that when a needed resource is locked, a thread can set a timer and try again in the future, or wait to be notified that the resource is no longer locked.

cpp

class reader
{
string name_;
public:
reader(const string& name) : name_(name) {}

void operator()() {
for (;;this_thread::sleep(posix_time::milliseconds(1)))
{
shared_lock<shared_mutex> lock(m, try_to_lock);
lock_guard<mutex> cout_lock(io_m);
cout << "Thread " << name_;
if (lock)
cout << " says that the value is " << shared_value << "." << endl;
else
cout << " tried to read the value, but could not." << endl;
}
}
};

class writer
{
string name_;
public:
writer(const string& name) : name_(name) {}
void operator()() {
for (;;this_thread::sleep(posix_time::milliseconds(1)))
{
unique_lock<shared_mutex> lock(m, try_to_lock);
lock_guard<mutex> cout_lock(io_m);
cout << "Thread " << name_;
if (lock)
{
cout << " is taking the lock." << endl;
shared_value = rand() % 10;
cout << "Thread " << name_ << " is changing the value to " << shared_value << endl;
cout << "Thread " << name_ << " is releasing the lock. " << endl;
}
else
cout << " tried to write to the value, but could not." << endl;
}
}
};

int main()
{
thread t1 = thread(reader("one"));
thread t2 = thread(reader("two"));
thread t3 = thread(reader("three"));
thread t4 = thread(writer("four"));
writer("five")();
}

fsharp

open System.Threading
let lock = new ReaderWriterLock()
let mutable value = 0
let lockTimeout = 1

let ReaderThread t =
let random = new System.Random()
for i in 0 .. 100 do
try
lock.AcquireReaderLock(lockTimeout)
try
printfn "Thread %i says that the value is %i" t value
finally
lock.ReleaseReaderLock()
with _ ->
printfn "Thread %i tried to read the value, but could not (timeout)." t
Thread.Sleep(random.Next(50))

let WriterThread t =
let random = new System.Random()
for i in 0 .. 100 do
try
lock.AcquireWriterLock(lockTimeout)
try
value <- random.Next(10)
printfn "Thread %i is changing the value to %i" t value
Thread.MemoryBarrier()
finally
lock.ReleaseWriterLock()
printfn "Thread %i is releasing the lock." t
with _ ->
printfn "Thread %i tried to write the value, but could not (timeout)." t
Thread.Sleep(random.Next(50))

[| 0 .. 20 |]
|> Array.iter (fun t ->
async {
if t % 3 = 0 then
WriterThread t
else
ReaderThread t
}
|> Async.Start
)

Separate user interaction and computation.

Allow your program to accept user interaction while conducting a long running computation.

Example:

Hello user! Please input a string to permute: (input thread)
abcdef
Passing on abcdef... (input thread)
Please input another string to permute: (input thread)
lol
Passing on lol... (input thread)
Done Work On abcdef! (worker thread)
["abcdef", "abcefd", ... ] (worker thread)
Please input another string to permute: (input thread)
EXIT
Quitting, I

'll let my worker thread know... (input thread)

We'

re quitting! Alright! (worker thread)

--Notice, that this could be accomplished on the command line or within a GUI. The point is that computation and user interaction should take place on separate threads of control.

cpp

class bg_worker
{
mutex bg_mutex_;
condition_variable work_present_;
deque<string> work_queue_;

result calc_perm(string s) {
result perms = result(new list<string>());

// sleep to simulate lots of work...
this_thread::sleep(posix_time::seconds(3));
sort(s.begin(), s.end());
do {
perms->push_back(s);
} while (next_permutation(s.begin(), s.end()));
return perms;
}

public:
void submit_work(const string &s) {
lock_guard<mutex> lock(bg_mutex_);
work_queue_.push_back(s);
work_present_.notify_one();
}

void operator()() {
for (;;) {
unique_lock<mutex> lock(bg_mutex_);
while (work_queue_.empty())
work_present_.wait(lock);
string s = work_queue_.front();
work_queue_.pop_front();
lock.unlock();

if (s == "EXIT") {
lock_guard<mutex> cout_lock(cout_mutex);
cout << "We're quitting! Alright!" << endl;
break;
}

result perm = calc_perm(s);
lock_guard<mutex> cout_lock(cout_mutex);
cout << "Done Work On " << s << "!" << endl;
cout << perm << endl;
}
}
};

int main()
{
bg_worker worker;
thread bg_thr(boost::ref(worker));
bool done = false;

{
lock_guard<mutex> cout_lock(cout_mutex);
cout << "Hello user! Please input a string to permute:" << endl;
}

while (!done)
{
string input;
cin >> input;
{
lock_guard<mutex> cout_lock(cout_mutex);
if (input == "EXIT") {
cout << "Quitting, I'll let my worker thread know..." << endl;
done = true;
} else {
cout << "Passing on " << input << "..." << endl;
cout << "Please input another string to permute:" << endl;
}
}
worker.submit_work(input);
}

bg_thr.join();
}

fsharp

open System

/// Computes all permutations of an array
let rec permute = function
| [| |] -> [| [| |] |]
| a ->
a
|> Array.mapi (fun i ai ->
Array.sub a 0 i
|> Array.append (Array.sub a (i + 1) (a.Length - i - 1))
|> permute
|> Array.map (fun perm -> Array.append [| ai |] perm)
)
|> Array.concat

/// Computes all permutations of a string
let permuteString (s: string) =
s.ToCharArray()
|> permute
|> Array.map (fun p -> new String(p))

type PermuteMessage =
| PermuteString of string
| Cancel

let mailbox = new MailboxProcessor<PermuteMessage>(fun inbox ->
let rec loop() =
async {
let! msg = inbox.Receive()
match msg with
| PermuteString s ->
printfn "[Worker] Starting to work on %s" s
let p = permuteString s
printfn "[Worker] Done my work on %s" s
let firstElems =
if s.Length > 4 then
let first = p |> Seq.truncate 4 |> Seq.toArray
String.Join(", ", first) + ", ..."
else
String.Join(", ", p)
printfn "[Worker] Result is %s" firstElems
return! loop()
| Cancel ->
printfn "[Worker] Nuff done, I'm quitting!"
return ()
}
loop()
)

do
printfn "[Input] Setting up worker."
mailbox.Start()
let loop = ref true
while !loop do
printfn "[Input] Please enter a word, or EXIT to exit"
let s = Console.ReadLine()
match s with
| "EXIT" ->
printfn "[Input] Sending worker the cancellation notice."
mailbox.Post(Cancel)
loop := false
| _ ->
printfn "[Input] Sending task to the worker."
mailbox.Post(PermuteString s)

i18n

i18n-helloworld

Put a internationalizate of HelloWorld program

Set locale to "es" (spanish) and provide a program that changes outputs ("Helloworld") depending of locale.

In pseudocode:

Void main ()

{



Locale.set("es")



print.translate("Helloworld, Locale.get)



}

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href="http://fr.weddingdressescompany.com/robes-de-mariée-2012-c-2.html ">Robes de mariée 2012</a></div><br/><div class="categories-top-list "><a class="category-top" href="http://fr.weddingdressescompany.com/robes-de-soirée-c-25.html ">Robes de soirée</a></div><br/><div class="categories-top-list "><a class="category-top" href="http://fr.weddingdressescompany.com/robes-de-soirée-c-27.html ">Robes de soirée</a></div><br/><div class="categories-top-list "><a class="category-top" href="http://fr.weddingdressescompany.com/robes-quinceanera-c-23.html ">robes Quinceanera</a></div><br/></div></div> <br/> <br/> <br/><div class="leftBoxContainer" id="whatsnew" style="width: 220px "> <br/><div class="sidebox-header-left "><h3 class="leftBoxHeading " id="whatsnewHeading ">Nouveaux produits - <a href="http://fr.weddingdressescompany.com/products_new.html "> [plus]</a></h3></div> <br/><div class="sideBoxContent centeredContent "><a href="http://fr.weddingdressescompany.com/asymétrique-sweetheart-siren-applique-ruché-de-mariage-sweep-longueur-de-robe-pwd110-p-498.html "><img src="http://fr.weddingdressescompany.com/images/weddingdress/princess_wedding_dresses_110.jpg" alt="Asymétrique sweetheart Siren Applique ruché de mariage Sweep Longueur de robe (PWD-110)" title=" Asymétrique sweetheart Siren Applique ruché de mariage Sweep Longueur de robe (PWD-110) " width="130" height="257" style="position:relative" onmouseover="showtrail('</code>images<code>/weddingdress/princess_wedding_dresses_110.jpg','Asymétrique sweetheart Siren Applique ruché de mariage Sweep Longueur de robe (PWD-110)',130,256,304,600,this,0,0,130,256);" onmouseout="hidetrail();" /</code>><<code>/a><a class="sidebox-products" href="http:/fr.weddingdressescompany.com/</code>asymétrique-sweetheart-siren-applique-ruché-de-mariage-sweep-longueur-de-robe-pwd110-p-498.html <code>">Asymétrique sweetheart Siren Applique ruché de mariage Sweep Longueur de robe (PWD-110)</a><div><span class="</code>normalprice <code>">$339.99 </span> <span class="</code>productSpecialPrice <code>">$169.99</span><span class="</code>productPriceDiscount <code>"><br />Economie : 50%</span></div></div><div class="</code>sideBoxContent centeredContent <code>"><a href="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/2012-chubby-à-encolure-en-v-à-taille-empire-applique-bretelles-robe-cour-train-pswd001-p-500.html "><img src="http:/fr.weddingdressescompany.com/</code>images<code>/weddingdress/</code>plus_size_wedding_dresses_001.jpg<code>" alt="</code>2012 Chubby à encolure en V à taille empire Applique bretelles Robe Cour Train (PSWD-001)<code>" title="</code> 2012 Chubby à encolure en V à taille empire Applique bretelles Robe Cour Train (PSWD-001) <code>" width="</code>130<code>" height="</code>173<code>" style="</code>position:relative<code>" onmouseover="</code>showtrail(<code>'images/weddingdress//plus_size_wedding_dresses_001.jpg'</code>,<code>'2012 Chubby à encolure en V à taille empire Applique bretelles Robe Cour Train (PSWD-001)'</code>,130,173,300,400,this,0,0,130,173);<code>" onmouseout="</code>hidetrail();<code>" /></a><a class="</code>sidebox-products<code>" href="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/2012-chubby-à-encolure-en-v-à-taille-empire-applique-bretelles-robe-cour-train-pswd001-p-500.html ">2012 Chubby à encolure en V à taille empire Applique bretelles Robe Cour Train (PSWD-001)</</code>a><div><span class=<code>"normalprice "</code>>$318.99 <<code>/span> <span class="productSpecialPrice ">$158.99</</code>span><span class=<code>"productPriceDiscount "</code>><br <code>/>Economie : 50%</</code>span><<code>/div></</code>div><div class=<code>"sideBoxContent centeredContent "</code>><a href=<code>"http://fr.weddingdressescompany.com/elégant-aligne-bretelles-plus-size-sash-avec-robe-applique-longueur-de-balayage-pswd003-p-501.html "</code>><img src=<code>"http://fr.weddingdressescompany.com/images/weddingdress/plus_size_wedding_dresses_003.jpg"</code> alt=<code>"Elégant A-ligne bretelles Plus Size Sash Avec Robe Applique Longueur de balayage (PSWD-003)"</code> title=<code>" Elégant A-ligne bretelles Plus Size Sash Avec Robe Applique Longueur de balayage (PSWD-003) "</code> width=<code>"130"</code> height=<code>"173"</code> style=<code>"position:relative"</code> onmouseover=<code>"showtrail('images/weddingdress//plus_size_wedding_dresses_003.jpg','Elégant A-ligne bretelles Plus Size Sash Avec Robe Applique Longueur de balayage (PSWD-003)',130,173,1000,1333,this,0,0,130,173);"</code> onmouseout=<code>"hidetrail();"</code> <code>/></</code>a><a class=<code>"sidebox-products"</code> href=<code>"http://fr.weddingdressescompany.com/elégant-aligne-bretelles-plus-size-sash-avec-robe-applique-longueur-de-balayage-pswd003-p-501.html "</code>>Elégant A-ligne bretelles Plus Size Sash Avec Robe Applique Longueur de balayage (PSWD-003)<<code>/a><div><span class="normalprice ">$348.99 </</code>span> <span class=<code>"productSpecialPrice "</code>>$166.99<<code>/span><span class="productPriceDiscount "><br /</code>>Economie : 52%<<code>/span></</code>div><<code>/div><div class="sideBoxContent centeredContent "><a href="http:/fr.weddingdressescompany.com/</code>2012-slinky-applique-charme-sweetheart-tribunal-train-plissé-princess-dress-pwd111-p-499.html <code>"><img src="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/images/</code>weddingdress<code>/princess_wedding_dresses_111.jpg" alt="2012 Slinky Applique Charme sweetheart tribunal train plissé Princess Dress (PWD-111)" title=" 2012 Slinky Applique Charme sweetheart tribunal train plissé Princess Dress (PWD-111) " width="130" height="259" style="position:relative" onmouseover="showtrail('images/</code>weddingdress<code>//</code>princess_wedding_dresses_111.jpg<code>','</code>2012 Slinky Applique Charme sweetheart tribunal train plissé Princess Dress (PWD-111)<code>',130,259,301,600,this,0,0,130,259);" onmouseout="hidetrail();" /></a><a class="sidebox-products" href="http://fr.weddingdressescompany.com/2012-slinky-applique-charme-sweetheart-tribunal-train-plissé-princess-dress-pwd111-p-499.html ">2012 Slinky Applique Charme sweetheart tribunal train plissé Princess Dress (PWD-111)</a><div><span class="normalprice ">$326.99 </span> <span class="productSpecialPrice ">$165.99</span><span class="productPriceDiscount "><br />Economie : 49%</span></div></div></div> <br/> <br/></div></td> <br/><td id="columnCenter" valign="top "> <br/><br/> <br/><div id="navBreadCrumb "> <a href="http://fr.weddingdressescompany.com/ ">Accueil</a> :: <br/> <a href="http://fr.weddingdressescompany.com/robes-de-mariée-c-1.html ">Robes de Mariée</a> :: <br/> <a href="http://fr.weddingdressescompany.com/robes-de-mariée-robe-de-mariée-sexy-c-1_30.html ">Robe de mariée sexy</a> :: <br/>Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes<br/></div> <br/><br/> <br/> <br/> <br/><br/> <br/><br/> <br/> <br/><div class="centerColumn" id="productGeneral "> <br/> <br/> <br/><h1 id="productName" class="productGeneral ">Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes</h1> <br/> <br/><form name="cart_quantity" action="http://fr.weddingdressescompany.com/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html?action=add_product&number_of_uploads=0" method="post" enctype="multipart/form-data "><br/> <br/><div style="float:left; "> <br/> <br/> <br/> <br/><div id="productMainImage" class="centeredContent back "> <br/> <br/><noscript> <br/><a href="http://fr.weddingdressescompany.com/index.php?main_page=popup_image&pID=456" target="_blank "> <a href="http://fr.weddingdressescompany.com/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html" ><img src="http://fr.weddingdressescompany.com/images/weddingdress/sxw0018.jpg" alt="Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes" title=" Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes " width="240" height="329" /></a><br /><span class="imgLink ">Agrandir l'</code>image<<code>/span></</code>a><<code>/noscript> <br/></</code>div> <br/> <br/> <div id=<code>"productAdditionalImages "</code>> <br/> <div id=<code>"dfse "</code>><<code>/div> <br/> <div class="centerBoxContent "> <br/> <br/> <br/> <div class="additionalImages centeredContent back" style="width:100%; "><br/> <br/> <noscript><a href="http:/fr.weddingdressescompany.com/</code>low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html<code>" target="</code>_blank <code>"> <a href="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html" ><img src="http:/fr.weddingdressescompany.com/</code>images<code>/weddingdress/</code>sxw0018_01.jpg<code>" alt="</code>Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes<code>" title="</code> Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes <code>" width="</code>130<code>" height="</code>174<code>" style="</code>position:relative<code>" onmouseover="</code>showtrail(<code>'images/weddingdress//sxw0018_01.jpg'</code>,<code>'Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes'</code>,130,173,243,325,this,0,0,130,173);<code>" onmouseout="</code>hidetrail();<code>" /></a><br /><span class="</code>imgLinkAdditional <code>">Agrandir l'image</span></a></noscript></div><br/><br class="</code>clearBoth<code>" /> <br/> <br/></div></div> <br/> <br/></div> <br/> <br/><div style="</code>width:348px;float:right;<code>" id='pb-left-column'> <br/> <br/><span id="</code>productPrices<code>" class="</code>productGeneral <code>"> <br/>Price: <br/><span class="</code>normalprice <code>">$218.77 </span> <span class="</code>productSpecialPrice <code>">$175.01</span><span class="</code>productPriceDiscount <code>"><br />Economie : 20%</span></span> <br/><div class="</code>model_number<code>" style="</code>height:14px;padding-top:7px <code>"><h4 style="</code>float: left;color:black; <code>"><label class="</code>class <code>">Modèle : </label></h4><div style="</code>float: left;margin-top:5px;margin-left:6px; <code>"><span style="</code>font-size:12px;height:20px;color:black; <code>">Mall3411</span></div><br/></div> <br/> <br/> <br/> <br/> <br/> <br/><div id="</code>productAttributes <code>"> <br/><h1 style='margin-bottom: 10px;'>Step 1 - Choose Options:</h1> <br/> <br/> <br/><div class="</code>wrapperAttribsOptions <code>"> <br/><h4 class="</code>optionName back <code>"><label>Colors</label></h4> <br/><div class="</code>back <code>"><br/><select name="</code>id<code>[8]</code><code>" id="</code>attrib-8 <code>"><br/> <option value="</code>46 <code>">1</option><br/> <option value="</code>52 <code>">10</option><br/> <option value="</code>53 <code>">12</option><br/> <option value="</code>54 <code>">16</option><br/> <option value="</code>55 <code>">17</option><br/> <option value="</code>56 <code>">18</option><br/> <option value="</code>47 <code>">2</option><br/> <option value="</code>57 <code>">20</option><br/> <option value="</code>58 <code>">21</option><br/> <option value="</code>59 <code>">23</option><br/> <option value="</code>60 <code>">26</option><br/> <option value="</code>61 <code>">27</option><br/> <option value="</code>62 <code>">28</option><br/> <option value="</code>63 <code>">29</option><br/> <option value="</code>64 <code>">30</option><br/> <option value="</code>65 <code>">31</option><br/> <option value="</code>66 <code>">33</option><br/> <option value="</code>67 <code>">35</option><br/> <option value="</code>68 <code>">36</option><br/> <option value="</code>69 <code>">37</option><br/> <option value="</code>48 <code>">4</option><br/> <option value="</code>70 <code>">41</option><br/> <option value="</code>71 <code>">43</option><br/> <option value="</code>72 <code>">44</option><br/> <option value="</code>73 <code>">47</option><br/> <option value="</code>74 <code>">48</option><br/> <option value="</code>75 <code>">49</option><br/> <option value="</code>49 <code>">5</option><br/> <option value="</code>76 <code>">51</option><br/> <option value="</code>77 <code>">54</option><br/> <option value="</code>78 <code>">56</option><br/> <option value="</code>79 <code>">60</option><br/> <option value="</code>80 <code>">61</option><br/> <option value="</code>81 <code>">66</option><br/> <option value="</code>82 <code>">67</option><br/> <option value="</code>83 <code>">69</option><br/> <option value="</code>84 <code>">73</option><br/> <option value="</code>85 <code>">77</option><br/> <option value="</code>86 <code>">78</option><br/> <option value="</code>87 <code>">79</option><br/> <option value="</code>50 <code>">8</option><br/> <option value="</code>51 <code>">9</option><br/> <option value="</code>27 <code>">Ivory</option><br/> <option value="</code>26 <code>">Same As Picture</option><br/> <option value="</code>28 <code>">White</option><br/></select><br/><br/></div> <br/><br class="</code>clearBoth<code>" /> <br/></div> <br/> <br/> <br/> <br/> <br/><br/><br class="</code>clearBoth<code>" /> <br/> <br/><div class="</code>wrapperAttribsOptions <code>"> <br/><h4 class="</code>optionName back <code>"><label>Sizes</label></h4> <br/><div class="</code>back <code>"><br/><select name="</code>id<code>[9]</code><code>" id="</code>attrib-9 <code>"><br/> <option value="</code>29 <code>">US 10 / UK 12 / EUR 40</option><br/> <option value="</code>30 <code>">US 12 / UK 14 /EUR 42</option><br/> <option value="</code>31 <code>">US 14 / UK 16 /EUR 44</option><br/> <option value="</code>32 <code>">US 16 / UK 18 /EUR 46</option><br/> <option value="</code>33 <code>">US 18 / UK 20 /EUR 48</option><br/> <option value="</code>34 <code>">US 2 / UK 4 /EUR 32</option><br/> <option value="</code>35 <code>">US 20 / UK 22 /EUR 50</option><br/> <option value="</code>36 <code>">US 22 / UK 24 /EUR 52</option><br/> <option value="</code>37 <code>">US 24 / UK 26 /EUR 54</option><br/> <option value="</code>38 <code>">US 26 / UK 28 /EUR 56</option><br/> <option value="</code>39 <code>">US 28 / UK 30 /EUR 58</option><br/> <option value="</code>40 <code>">US 4 / UK 6 /EUR 34</option><br/> <option value="</code>41 <code>">US 6 / UK 8 /EUR 36</option><br/> <option value="</code>42 <code>">US 8 / UK 10 /EUR 38</option><br/></select><br/><br/></div> <br/><br class="</code>clearBoth<code>" /> <br/></div> <br/> <br/> <br/> <br/> <br/><br/><br class="</code>clearBoth<code>" /> <br/> <br/><div class="</code>wrapperAttribsOptions <code>"> <br/><h4 class="</code>optionName back <code>"><label>Back style</label></h4> <br/><div class="</code>back <code>"><br/><select name="</code>id<code>[10]</code><code>" id="</code>attrib-10 <code>"><br/> <option value="</code>44 <code>">Lace Up</option><br/> <option value="</code>43 <code>">Same As Picture</option><br/> <option value="</code>45 <code>">Zip Up</option><br/></select><br/><br/></div> <br/><br class="</code>clearBoth<code>" /> <br/></div> <br/> <br/> <br/> <br/> <br/><br/><br class="</code>clearBoth<code>" /> <br/> <br/><div style="</code>padding-bottom:5px; <code>"><a href="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/size.html" style="color:black;font-weight:bold;text-decoration:underline; color:#FF0000;" target="_blank ">Size Chart</</code>a> | <a href=<code>"http://fr.weddingdressescompany.com/color.html"</code> style=<code>"color:black;font-weight:bold;text-decoration:underline;color:#FF0000;"</code> target=<code>"_blank "</code>>Color Chart<<code>/a></</code>div> <br/> <br/> <br/><<code>/div> <br/><div id='quantity_cart'> <br/><h1>Step 2 - Choose Quantity:</</code>h1> <br/> <br/> <br/> <div class=<code>"wrapperAttribsOptions"</code> style=<code>"height:14px;padding-top:7px "</code>><h4 style=<code>"float:left; "</code>><label class=<code>"attribsInput "</code>>Quantity :<<code>/label></</code>h4><div style=<code>"float:left; "</code>><input type=<code>"text"</code> class=<code>"text"</code> id=<code>"quantity_wanted"</code> name=<code>"cart_quantity"</code> value=<code>"1"</code> maxlength=<code>"6"</code> size=<code>"4"</code> <code>/></</code>div><<code>/div> <br/> <br class="clearBoth "> <br/> <h1 style='margin-bottom: 10px;'>Step 3 - Add to cart:</</code>h1> <br/> <p id=<code>'add_to_cart'</code> class=<code>'buttons_bottom_block'</code>> <br/> <input type=<code>"hidden"</code> name=<code>"products_id"</code> value=<code>"456"</code> <code>/><input type="image" src="http:/fr.weddingdressescompany.com/</code>includes<code>/templates/</code>weddingdress-7<code>/buttons/</code>french<code>/button_in_cart.gif" alt="ajouter au panier" title=" ajouter au panier " /</code>> <<code>/p> <br/> <br/></</code>div> <br/><div> <br/> <div class=<code>'safe_onlinechat'</code>> <br/> <div class=<code>'safe_ssl'</code>> <br/> <a target=<code>'_blank'</code> href=<code>'msnim:chat?contact=myonlineservice@msn.com'</code> style=<code>"float:left; "</code>><img src=<code>'http://fr.weddingdressescompany.com/banner/msn.jpg'</code>><<code>/a> <br/> <a target='_blank' href='callto:/meganfox59'><img border=0 align='absmiddle' src='http:/fr.weddingdressescompany.com/</code>banner<code>/skype.jpg' style="float:left; "></</code>a> <br/> <<code>/div> <br/> </</code>div> <br/> <br/><<code>/div> <br/> <br/></</code>div> <br/> <br/> <br/><br class=<code>"clearBoth"</code> <code>/> <br/><div id='descript_menu'> <br/><ul id='more_info_tabs' class='idTabs idTabsShort'> <br/> <li><a onclick='dissplay_descript(this);' style='cursor:pointer;'>Details</</code>span><<code>/a></</code>li> <br/> <li><a onclick=<code>'displaysize(this);'</code>style=<code>'cursor:pointer;'</code>>SIZE & COLOR CHART<<code>/a></</code>li> <br/> <li><a onclick=<code>'dissplay_return(this);'</code>style=<code>'cursor:pointer;'</code>>Shipping<<code>/a></</code>li> <br/> <li><a onclick=<code>'measure(this);'</code>style=<code>'cursor:pointer;'</code>>How to Measure<<code>/a></</code>li> <br/><<code>/ul> <br/><script> <br/> function displaysize(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> var descript = document.getElementById('productDescription'); <br/> <br/> idTabtwo.setAttribute('class','block_hidden_only_for_screen'); <br/> descript.setAttribute('class','display'); <br/> shipping_return.setAttribute('class','display'); <br/> measure.setAttribute('class','display'); <br/> } <br/> function dissplay_descript(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var descript = document.getElementById('productDescription'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> descript.setAttribute('class','block_hidden_only_for_screen'); <br/> idTabtwo.setAttribute('class','display'); <br/> shipping_return.setAttribute('class','display'); <br/> measure.setAttribute('class','display'); <br/> <br/> } <br/> function dissplay_return(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> var descript = document.getElementById('productDescription'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> shipping_return.setAttribute('class','block_hidden_only_for_screen'); <br/> idTabtwo.setAttribute('class','display'); <br/> descript.setAttribute('class','display'); <br/> measure.setAttribute('class','display'); <br/> <br/> } <br/> function measure(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> var descript = document.getElementById('productDescription'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> measure.setAttribute('class','block_hidden_only_for_screen'); <br/> idTabtwo.setAttribute('class','display'); <br/> descript.setAttribute('class','display'); <br/> shipping_return.setAttribute('class','display'); <br/> <br/> <br/> <br/> } <br/></</code>script> <br/><div id=<code>'more_info_sheets'</code> class=<code>'sheets align_justify'</code>> <br/> <br/><div id=<code>"productDescription"</code> class=<code>'displayblock'</code>>Nom de l<code>'article:</div> <br/> <br/><div id='</code>idTabtwo<code>' class='</code>display<code>'> <br/> <div class='</code>SizeKind<code>'> <br/> <div style='</code>background-attachment: scroll; background-image: none; background-position: 0pt 0pt; background-repeat: repeat; border-bottom: 1px solid rgb(238, 238, 238); margin-bottom: 10px; padding-bottom: 10px; padding-top: 10px; text-align: center;<code>'> <br/> <p style='</code>font-weight: bold; color: rgb(178, 30, 54); font-size: 14px;<code>'>Please choose your favorite color from the palette</p> <br/> <a id='</code>single_3<code>' href='</code>http:<code>//</code>fr.weddingdressescompany.com<code>/image/</code>img_ColorCard.jpg<code>'><img src='</code>http:<code>//</code>fr.weddingdressescompany.com<code>/image/</code>img_ColorCard.jpg<code>' alt='</code>wedding dress card palette<code>' width='</code>720<code>'></a> <br/> <p style='</code>text-align: left;<code>'><span style='</code>color: rgb(255, 0, 0);<code>'>Notice:</span>Since computer screens have chromatic aberration, especially between CRT screen and LCD screen, we can not guarantee the color of the dress you get will be 100% similar as the color chart. And also different fabrics will show different color degree on the same color. So we can not accept any returned dress for sake of color. Please kindly understand us.</p> <br/> </div> <br/> <div style='</code>background-attachment: scroll; background-image: none; background-position: 0pt 0pt; background-repeat: repeat; border-bottom: 1px solid rgb(238, 238, 238); margin-bottom: 20px; padding-bottom: 20px; padding-top: 10px; text-align: center;<code>'> <br/> <p style='</code>font-weight: bold; color: rgb(178, 30, 54); font-size: 14px;<code>'> Please choose your size</p> <br/> <table cellspacing="0" cellpadding="0 "> <br/> <tbody> <br/> <tr> <br/> <th colspan="15 ">Standard size (in centimeter)</th> <br/> </tr> <br/> <tr> <br/> <br/> <th>US size no</th> <br/> <td>2</td> <br/> <td>4</td> <br/> <td>6</td> <br/> <td>8</td> <br/> <td>10</td> <br/> <br/> <td>12</td> <br/> <td>14</td> <br/> <td>16</td> <br/> <td>18</td> <br/> <td>20</td> <br/> <td>22</td> <br/> <br/> <td>24</td> <br/> <td>26</td> <br/> <td>28</td> <br/> </tr> <br/> <tr> <br/> <th>EUR size no</th> <br/> <td>32</td> <br/> <br/> <td>34</td> <br/> <td>36</td> <br/> <td>38</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <td>44</td> <br/> <br/> <td>46</td> <br/> <td>48</td> <br/> <td>50</td> <br/> <td>52</td> <br/> <td>54</td> <br/> <td>56</td> <br/> <br/> <td>58</td> <br/> </tr> <br/> <tr> <br/> <th>Bust</th> <br/> <td>84</td> <br/> <td>86</td> <br/> <td>89</td> <br/> <br/> <td>91</td> <br/> <td>94</td> <br/> <td>98</td> <br/> <td>102</td> <br/> <td>105</td> <br/> <td>109</td> <br/> <br/> <td>114</td> <br/> <td>119</td> <br/> <td>124</td> <br/> <td>132</td> <br/> <td>142</td> <br/> </tr> <br/> <br/> <tr> <br/> <th>Waist</th> <br/> <td>66</td> <br/> <td>69</td> <br/> <td>71</td> <br/> <td>74</td> <br/> <br/> <td>76</td> <br/> <td>80</td> <br/> <td>84</td> <br/> <td>88</td> <br/> <td>91</td> <br/> <td>96</td> <br/> <br/> <td>102</td> <br/> <td>107</td> <br/> <td>114</td> <br/> <td>124</td> <br/> </tr> <br/> <tr> <br/> <th>Hip</th> <br/> <br/> <td>91</td> <br/> <td>94</td> <br/> <td>97</td> <br/> <td>99</td> <br/> <td>102</td> <br/> <td>105</td> <br/> <br/> <td>109</td> <br/> <td>113</td> <br/> <td>117</td> <br/> <td>122</td> <br/> <td>127</td> <br/> <td>132</td> <br/> <br/> <td>140</td> <br/> <td>150</td> <br/> </tr> <br/> <tr> <br/> <th>Shoulder to floor</th> <br/> <td>150</td> <br/> <td>150</td> <br/> <br/> <td>151</td> <br/> <td>152</td> <br/> <td>152</td> <br/> <td>153</td> <br/> <td>154</td> <br/> <td>154</td> <br/> <br/> <td>155</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <br/> </tr> <br/> </tbody> <br/></table> <br/><p> </p> <br/><table cellspacing="0" cellpadding="0 "> <br/> <tbody> <br/> <tr> <br/> <th colspan="15 ">Standard size (in inches)</th> <br/> </tr> <br/> <br/> <tr> <br/> <th>US size no</th> <br/> <td>2</td> <br/> <td>4</td> <br/> <td>6</td> <br/> <td>8</td> <br/> <br/> <td>10</td> <br/> <td>12</td> <br/> <td>14</td> <br/> <td>16</td> <br/> <td>18</td> <br/> <td>20</td> <br/> <br/> <td>22</td> <br/> <td>24</td> <br/> <td>26</td> <br/> <td>28</td> <br/> </tr> <br/> <tr> <br/> <th>EUR size no</th> <br/> <br/> <td>32</td> <br/> <td>34</td> <br/> <td>36</td> <br/> <td>38</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <br/> <td>44</td> <br/> <td>46</td> <br/> <td>48</td> <br/> <td>50</td> <br/> <td>52</td> <br/> <td>54</td> <br/> <br/> <td>56</td> <br/> <td>58</td> <br/> </tr> <br/> <tr> <br/> <th>Bust</th> <br/> <td>33</td> <br/> <td>34</td> <br/> <br/> <td>35</td> <br/> <td>36</td> <br/> <td>37</td> <br/> <td>39</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <br/> <td>43</td> <br/> <td>45</td> <br/> <td>47</td> <br/> <td>49</td> <br/> <td>52</td> <br/> <td>56</td> <br/> <br/> </tr> <br/> <tr> <br/> <th>Waist</th> <br/> <td>26</td> <br/> <td>27</td> <br/> <td>28</td> <br/> <td>29</td> <br/> <br/> <td>30</td> <br/> <td>32</td> <br/> <td>33</td> <br/> <td>35</td> <br/> <td>36</td> <br/> <td>38</td> <br/> <br/> <td>40</td> <br/> <td>42</td> <br/> <td>45</td> <br/> <td>49</td> <br/> </tr> <br/> <tr> <br/> <th>Hip</th> <br/> <br/> <td>36</td> <br/> <td>37</td> <br/> <td>38</td> <br/> <td>39</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <br/> <td>43</td> <br/> <td>45</td> <br/> <td>46</td> <br/> <td>48</td> <br/> <td>50</td> <br/> <td>52</td> <br/> <br/> <td>55</td> <br/> <td>59</td> <br/> </tr> <br/> <tr> <br/> <th>Shoulder to floor</th> <br/> <td>59</td> <br/> <td>59</td> <br/> <br/> <td>60</td> <br/> <td>60</td> <br/> <td>60</td> <br/> <td>60</td> <br/> <td>61</td> <br/> <td>61</td> <br/> <br/> <td>61</td> <br/> <td>61</td> <br/> <td>62</td> <br/> <td>62</td> <br/> <td>62</td> <br/> <td>62</td> <br/> <br/> </tr> <br/> </tbody> <br/></table> <br/> <br/> </div> <br/> <br class='</code>clear<code>'> <br/> </div> <br/></div> <br/> <br/> <br/> <div id="tab_3" class='</code>display<code>'> <br/> <br/> <h3>Shipping Time</h3> <br/><p>Total Time=Operation Time + Shipping Time</p> <br/><p>Default operation time is 30 business days from the day you place an order. <br/>We will rush your order within 20 business days and 15 business days if you <br/>choose rush service from the operation time option,and you will pay extra <br/>cost for it.Shipping time varies as: UPS , TNT 2-4 business days, Air Mail(Express) 10 <br/>business days, Air Mail(Normal) 20 business days. Please calculate the total <br/>time carefully before you place the order.</p> <br/><p><i>Note: You can also choose Air Mail(Normal) if package weight is under 2kg.</i></p> <br/> <br/><h3>Return Tips</h3> <br/><p>If any returns, please contact our customer support within 24 hours from the time you receive your gown and fill in the Application for Refund in email. Only products in their original condition will be accepted. We do not accept returns on any custom made order. ALL SALES ARE FINAL for custom made dresses. For mis-shipped items, once confirmation got with us, we will be responsible for item exchange and have full refund returned including shipping fee and handling fee. In principle, any emergency order isnot subject to this return policy and will be denied. Also other merchandise, such as veil ect.</p></div> <br/> <br/><div id="idTabMeasure" style="height:510px;" class='</code>display<code>'> <br/> <div class="tempnr_box "> <br/> <br/> <div class="images_zuo "> <a href="http://fr.weddingdressescompany.com/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html" ><img width="163" height="479" src="http://fr.weddingdressescompany.com/image/wedding_size.jpg"/></a></div> <br/> <br/> <div class="nr_right "> <br/> <p style="color:#b21e36;font-size:14px;font-style:italic;font-weight:bold; padding-left:0; ">How to Measure</p> <br/> <ul><li><span class="wzys ">A.Bust:</span>Measure Around The Fullest Part Of Your Bust.</li> <br/> <br/> <li><span class="wzys ">B.Waist:</span>Measure Around The Smallest Part Of Your Waistline.</li> <br/> <li><span class="wzys ">C.Hips:</span>Measure Around The Widest Part Of Your Hips.</li> <br/> <li><span class="wzys ">D.Length:</span> Measure From Top Of The Shoulder Through The Nipple To Floor,Including The Height Of <b>Wedding Shoes</b>.</li> <br/> <li><span class="wzys ">E.Under Bust:</span>Measure Around Under Your Bust.</li> <br/> <br/> <li><span class="wzys ">F.Nipple To Nipple:</span> The Measurement Between Your Two Nipples.</li> <br/> <li><span class="wzys ">G.Shoulder To NiPPLE:</span>Measure From Top Of The Shoulder To Nipple.</li> <br/> <li><span class="wzys ">H.Shoulder TO Waist:</span>Measure From Top Of The Shoulder Through The Nipple TO Waist.</li> <br/> <li><span class="wzys ">I.Shoulder To Hips:</span>Measure From Top Of The Shoulder Through The Nipple TO Hips.</li> <br/> <br/> <li><span class="wzys ">J.Shoulder To Shoulder:</span>Measure Your Shoulder Width From The Back.</li> <br/> <li><span class="wzys ">k.Neck:</span>Measure Around The Fullest Part Of Your Neck.</li> <br/> <li><span class="wzys ">L.Biceps:</span>Measure Around The Widest Part Of Your Arm.</li> <br/> <li class="wzys" style="color:#DD0000;font-size:14px;font-weight:bold;padding:5px;text-align:right;border:1px solid #eee; ">Please Measure With Bra and Underwear On.</li> <br/> <li class="wzys" style="font-size:11px;font-weight:bold;text-align:right; ">Remember To Keep The Measuring Tape Comfortably Loose.</li></ul> <br/> <br/> <br class="clear" /> <br/> <div><span style="color:#DD0000; margin-top:10px; ">Notice:</span>1. Please also tell us your "Height with Shoes" on (measured from top head to your wedding shoes'</code> heel).<br> <br/>2. Please remember that wear your Wedding Underwear and your Wedding Shoes.<br> <br/>3.Inches and Centimetersare both available for size, and please tell us if you use inches or centimeters.<br> <br/>4. We suggest you measure yourself by a Professional Tailor. <br> <br/>5. It is very normal to have 3CM measurement error between the sizes you give and the sizes you will receive on your dress. This kind of error can not be accepted for any returns and exchanges. <<code>/div> <br/> <br/> </</code>div> <br/> <br/> <span class=<code>"clear "</code>><<code>/span> <br/> </</code>div> <br/> <<code>/div> <br/> <br/></</code>div> <br/><<code>/div> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br class="clear" /</code>> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/><<code>/form> <br/> <br/></</code>div> <br/><<code>/td> <br/> <br/> <br/></</code>tr> <br/><<code>/table> <br/><br/> <br/> <br/><div id="navSuppWrapper "> <br/> <br/><div id="navSupp "> <br/><ul><li><a href="http:/fr.weddingdressescompany.com/</code>index.php <code>">Accueil</a></li> <br/><li><a href="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/index.php?main_page=shippinginfo ">Frais de port</</code>a><<code>/li> <br/><li><a href="http:/fr.weddingdressescompany.com/</code>index.php?main_page=Wholesale <code>">Vente en 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