All Problems
Strings
Printing

Output a string to the console

Write the string "Hello World!" to STDOUT
ruby
puts "Hello World!"
$stdout<<"Hello World!"
csharp
System.Console.WriteLine("Hello World!")
cpp
std::cout << "Hello World" << std::endl;
std::printf("Hello World\n");
Console::WriteLine(L"Hello World");
fantom
echo("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();
fantom
encoded := `http://myserver.com/custinfo/edit.php`.plusQuery(
["fname":"Ron & Jean", "lname":"Smith"]).encode
echo(encoded)
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);
}
fantom
s:=Str[,].fill("The quick brown fox jumps over the lazy dog. ",10).join
while(s.size>0){
echo("> "+s[0..(77.min(s.size))-1])
s=(s.size>77)?s[77..-1].trim : ""
}
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 "\#{'}${"}/"
ruby
special = '\#{\'}${"}/'
csharp
string verbatim = @"\#{'}${""""}/";
string cStyle = "\\#{'}${\"\"}/";
cpp
std::string special = "\\#{'}${\"}/";
String^ special = L"\\#{'}${\"}/";
fantom
special := Str<|\#{'}${"}/|>
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"
csharp
string output = "This\nIs\nA\nMultiline\nString";
string output = @"This
Is
A
Multiline
String";
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";
fantom
s := "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)
csharp
int a = 3;
int b = 4;
Console.WriteLine("{0}+{1}={2}", a,b,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;
fantom
echo("$a+$b=${a+b}")
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
csharp
var str = "reverse me";
Console.WriteLine(new String(str.Reverse().ToArray()));
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());
fantom
"reverse me".reverse
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(' ')
csharp
var str = "This is a end, my only friend!";
str = String.Join(" ", str.Split().Reverse().ToArray());
Console.WriteLine(str);
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();
fantom
"This is a end, my only friend!".split.reverse.join(" ")
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")
csharp
using System;
using System.Text;
using System.Linq; // used for Array.ToList() extension

public class TextWrapper {

/// <summary>
/// Wrap the given text to a given width.
/// </summary>
/// <param name="text">The text to be wrapped</param>
/// <param name="width">The maximum width of each line</param>
/// <param name="prefix">Begin each line with this prefix</param>
/// <returns>The wrapped text</returns>
public string Wrap(string text, int width, string prefix) {

var words = text.Split(' ').ToList();
var result = new StringBuilder(prefix);

width = width - prefix.Length;
prefix = "\n" + prefix;

int lineSize = 0;
foreach (var word in words) {
int wordLen = word.Length;

// Do we need to start a new line?
if ((lineSize + wordLen) > width) {
result.Remove(result.Length - 1, 1); // remove trailing space
lineSize = 0;
result.Append( prefix );
}

result.Append(word).Append(' ');
lineSize += wordLen + 1;
}

return result.ToString();
}

public static void Main() {
var prefix = "> ";
var sentence = "The quick brown fox jumps over the lazy dog. ";

var text = "";
for (int i = 0; i < 10; i++)
text += sentence;

// The description said lines of length 78, but
// the example was 72...
Console.WriteLine(new TextWrapper().Wrap(text, 72, prefix));
}
}
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);
}
fantom
buf := Buf()
10.times { buf.writeChars("The quick brown fox jumps over the lazy dog. ") }
buf.flip

out := Env.cur.out
sep := ">"; max := 72 - sep.size - 1
acc := 0; Str? s := null
while ((s = buf.readStrToken) != null)
{
if (acc == 0)
out.print(sep)

acc += s.size
if (acc > max)
{
out.print("\n$sep")
acc = s.size
}
out.print(" $s")
buf.readStrToken(4096) { !it.isSpace }
acc++
}
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!
csharp
string str = " hello ";
str = str.Trim();
Console.WriteLine(str);
cpp
String^ s = " hello "; String^ trimmed = s->Trim();
fantom
s := " 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;
}
fantom
rot := |Str s, |Int c -> Int| remap -> Str|
{
rs := ""
s.each { rs += remap(it).toChar }
return rs
}

rot13 := |Str s -> Str|
{
rot(s) |Int c -> Int|
{
lc := c.lower
c += (lc >= 'a' && lc <= 'm') ? 13
: ((lc >= 'n' && lc <= 'z') ? -13 : 0)
return c
}
}

rot47 := |Str s -> Str|
{
rot(s) |Int c -> Int|
{
c += (c >= '!' && c <= 'O') ? 47
: ((c >= 'P' && c <= '~') ? -47 : 0)
return c
}
}

s := "Hello World #123"
echo("s=$s")
echo("rot13=${rot13(s)}")
echo("rot47=${rot47(s)}")
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
csharp
string output = "Space Monkey"

System.Console.WriteLine(output.ToUpper())
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);
fantom
s := "Space Monkey".localeUpper
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
csharp
string str = "Caps ARE overRated";
str = str.ToLower() ;
Console.WriteLine(str);
cpp
std::string s = "Caps ARE overRated";
std::string sl(boost::to_lower_copy(s));
String(L"Caps ARE overRated").ToLower();
fantom
s := "Caps ARE overRated".localeLower
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) * ' '
csharp
System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo.ToTitleCase("man OF stEEL".ToLowerInvariant());
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();
fantom
"man OF stEEL".split.map { it.localeLower.localeCapitalize }.join(" ")
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)
csharp
System.Drawing.Point p = new System.Drawing.Point(13, 14),
p1 = new System.Drawing.Point(10, 10);
double distance = Math.Sqrt(Math.Pow(p1.X - p.X, 2) + Math.Pow(p1.Y - p.Y, 2)));
cpp
Point p1 = {34, 78}, p2 = {67, -45};
double distance = ::distance(p1, p2);
Console::WriteLine("{0,3:F2}", distance);
fantom
px1 := 34.0f; py1 := 78.0f; px2 := 67.0f; py2 := -45.0f
distance := |Float x1, Float y1, Float x2, Float y2 -> Float|
{ ((x2-x1).pow(2.0f) + (y2-y1).pow(2.0f)).sqrt }

distance(px1, py1, px2, py2)
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
csharp
string.Format("{0,8:D8}", 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;
fantom
formatted := 42.toStr.padl(8, '0')
formatted := 42.toLocale("00000000")
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)
csharp
public class NumberRightPadding {
public static void Main() {
string withStringDotFormat = string.Format("{0,-6}", 1024);
string withToStringDotPadRight = 1024.ToString().PadRight(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;
fantom
formatted := 1024.toStr.padr(6)
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)
csharp
public class FormatDecimal {
public static void Main() {
decimal result = decimal.Round( 7 / 8m, 2);
System.Console.WriteLine(result);
}
}
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;
fantom
formatted := (7.0/8.0).toLocale("0.00")
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)
csharp
public class NumberLeftPadding {
public static void Main() {
string withStringDotFormat = string.Format("{0,10}", 73);
string withToStringDotPadLeft = 73.ToString().PadLeft(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;
fantom
formatted := 73.toStr.padl(10)
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;
csharp
System.Random r = new System.Random();
int random = r.Next(100,201);
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();
fantom
r := Int.random(100..200)
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
csharp
using System;

public class RepeatableRandom {
public static void Main() {
var r = new Random(12); // seed is 12

for (int i = 0; i < 5; i++)
Console.WriteLine(r.Next());

r = new Random(12);

for (int i = 0; i < 5; i++)
Console.WriteLine(r.Next());
}
}

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);
fantom
rand := Random.makeSeeded(12345)
first := Int[,].fill(0,5).map { rand.next(100..200) }

rand2 := Random.makeSeeded(12345)
second := Int[,].fill(0,5).map { rand2.next(100..200) }
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]+$/)
csharp
if (Regex.IsMatch("Hello", "[A-Z][a-z]+"))
{
Console.WriteLine("ok");
}
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;
fantom
if (Regex<|[A-Z][a-z]+|>.matches("Hello"))
echo("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 $1 if "one two three"=~/^one (.*) three$/
csharp
using System;
using System.Text.RegularExpressions;

public class RegexBackReference {
public static void Main() {
var oneTwoThree = "one two three";
var pattern = "one (.*) three";

Match match = Regex.Match(oneTwoThree, pattern);

// group 0 is the entire match. 1 is the first backreference
Console.WriteLine(match.Groups[1]);
}
}
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;
fantom
m := Regex<|one (.*) three|>.matcher("one two three")
if (m.matches)
echo("${m.group(1)}")
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 @#$" matches /\d+/
ruby
puts "ok" if (text=~/\d+/)
csharp
if(System.Text.RegularExpressions.Regex.IsMatch("abc 123 @#$",@"\d+")){
Console.WriteLine("ok");
}
cpp
if (Regex::IsMatch("abc 123 @#$", "\\d+")) Console::WriteLine("ok");
fantom
m := Regex<|\d+|>.matcher("abc 123 @#\$")
if (m.find)
echo("ok")
erlang
% Erlang uses 'egrep'-compatible regular expressions, so shortcuts like '\d' not supported
String = "abc 123 @#$", 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
}
csharp
using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

public static class extensions {
public static IList<string> Map(this string me, string pattern, Func<Match, string> action){
IList<string> matches = new List<string>();
foreach (Match match in Regex.Matches(me,pattern)){
matches.Add(action(match));
}
return matches;
}
}

class Test
{
static void Main()
{
IList<string> list = "(fish):1 sausage (cow):3 tree (boat):4".Map(@"\((\w+)\):(\d+)", (m) => {return m.Groups[1].Value + m.Groups[2].Value;});
}
}
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();
}
fantom
m := Regex<|\((\w+)\):(\d+)|>.matcher(s)
list := Str[,]
while (m.find) { list.add("${m.group(1)}${m.group(2)}") }
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);
fantom
replaced := Regex<|e|>.split("Red Green Blue",2).join("*")
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")
csharp
using System.Text.RegularExpressions;

class SolutionXX
{
static void Main()
{
string text = "She sells sea shells";
string result = Regex.Replace(text, @"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");
fantom
replaced := Regex<|se\w+|>.split("She sells sea shells").join("X")
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));
fantom
s := "The {Quick} Brown {Fox}"
m := Regex<|\{(\w+)\}|>.matcher(s)
buf := StrBuf(s.size)
last := 0
while (m.find)
{
buf.add(s[last..m.start-1]).add(m.group(1).reverse)
last = m.end
}
buf.add(s[last..-1])
replaced := buf.toStr
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
csharp
var list = new List<object>();
cpp
Generic::List<String^>^ list = gcnew Generic::List<String^>();
std::list<std::string> list;
fantom
list := [,]
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)
csharp
IList<string> list = new string[]{"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";
fantom
list := ["One", "Two", "Three", "Four", "Five"]
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(', ')
csharp
using System.Collections.Generic;
public class JoinEach {
public static void Main() {
var list = new List<string>() {"Apple", "Banana", "Carrot"};
System.Console.WriteLine( string.Join(", ", list.ToArray()) );
}
}
cpp
String^ result = String::Join(L", ", fruit->ToArray());
string fruits[] = {"Apple", "Banana", "Carrot"};
string result = boost::algorithm::join(fruits, ", ");
fantom
["Apple", "Banana", "Carrot"].join(", ")
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
csharp
using System.Collections.Generic;
using System.Linq;

public class CSharpListToEnglishList {
public string JoinAsEnglishList (List<string> words) {
switch (words.Count) {
case 0: return "";
case 1: return words[0];
case 2: return string.Format("{0} and {1}", words.ToArray());
default:
return JoinAsEnglishList( new List<string>() {
string.Join(", ", words.Take(words.Count - 1).ToArray()) + ",",
words.Last()
});
}
}
// Driver...
public static void Main() {
var joiner = new CSharpListToEnglishList();
System.Console.WriteLine(
joiner.JoinAsEnglishList(new List<string>() { "Apple", "Banana", "Carrot", "Orange" }) );
System.Console.WriteLine(
joiner.JoinAsEnglishList(new List<string>() { "Apple", "Banana", "Carrot" }) );
System.Console.WriteLine(
joiner.JoinAsEnglishList(new List<string>() { "One", "Two" }) );
System.Console.WriteLine(
joiner.JoinAsEnglishList(new List<string>() { "Lonely" }) );
System.Console.WriteLine(
joiner.JoinAsEnglishList(new List<string>()) );
}
}
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);
}
}
fantom
join := |List list -> Str|
{
switch(list.size)
{
case 0: return ""
case 1: return list[0]
case 2: return list.join(" and ")
default: return list[0..-2].join(", ") + ", and " + list[-1]
}
}

echo(join(["Apple", "Banana", "Carrot"]))
echo(join(["One", "Two"]))
echo(join(["Lonely"]))
echo(join([,]))
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]}}
csharp
using System.Collections.Generic;
public class ListCombiner {
public static void Main() {
var letters = new List<char>() { 'a', 'b', 'c' };
var numbers = new List<int>() { 1, 2, 3 };

// result is a list that contaings lists of objects
var result = new List<List<object>>();
foreach (var l in letters) {
foreach (var n in numbers) {
result.Add(new List<object>() { 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;
fantom
[4,5].each |Int i| { ["a","b","c"].each |Str s| { r.add([i,s]) } }
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
csharp
List<String> values = new List<string> {"andrew", "bob", "chris", "bob"};

var duplicates = values
.GroupBy(i => i)
.Where(j => j.Count() > 1)
.Select(s => s.Key);
foreach (var duplicate in duplicates)
{
Console.WriteLine(duplicate);
}
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;
fantom
nameCounts := Str:Int[:] { def = 0 }
["andrew", "bob", "chris", "bob"].each |Str v| { nameCounts[v]++ }
results := nameCounts.findAll |Int v, Str k->Bool| { v > 1 }.keys
echo(results.join(","))
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
csharp
string[] items = new string[] { "One", "Two", "Three", "Four", "Five" };
List<string> list = new List<string>(items);
string third = list[2]; // "Three"
// Make sure you import the System.Linq namespace.
// This is not the preferred way of indexing if you are using Lists.
string[] items = new string[] { "One", "Two", "Three", "Four", "Five" };
IEnumerable<string> list = new List<string>(items);
string third = list.ElementAt(2); // Three
cpp
String^ result = list[2];
fantom
["One", "Two", "Three", "Four", "Five"][2]
["One", "Two", "Three", "Four", "Five"].get(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)
csharp
string[] items = new string[] { "Red", "Green", "Blue" };
List<string> list = new List<string>(items);
string last = list[list.Count - 1]; // "Blue"
// Make sure you import the System.Linq namespace.
// This is not the preferred way of finding the last element if you are using Lists.
string[] items = new string[] { "Red", "Green", "Blue" };
IEnumerable<string> list = new List<string>(items);
string last = list.Last(); // "Blue"
cpp
String^ result = list[list->Count - 1];
string last_elem = lst.back();
fantom
["Red", "Green", "Blue"][-1]
["One", "Two", "Three", "Four", "Five"].last
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
csharp
// Make sure you import the System.Linq namespace.
// This example uses arrays as the underlying implementation, but any IEnumerable type can be used - including List.
IEnumerable<string> beans = new string[] { "beans", "mung", "black", "red", "white" };
IEnumerable<string> colors = new string[] { "black", "red", "blue", "green" };
var intersect = beans.Intersect(colors); // ['red', 'black']
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);
fantom
beans := ["broad", "mung", "black", "red", "white"]
colors := ["black", "red", "blue", "green"]
echo(beans.intersection(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
csharp
using System.Collections.Generic;
using System.Linq;
public class UniqueElements {
public static void Main() {
var list = new List<int>() { 18, 16, 17, 18, 16, 19, 14, 17, 19, 18 };
var uniques = list.Distinct();
}
}
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"));
fantom
uniqueAges := [18, 16, 17, 18, 16, 19, 14, 17, 19, 18].unique
echo(uniqueAges)
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)
csharp
class Solution1516
{
static void Main()
{
List<string> fruit = new List<string>() { "Apple", "Banana", "Carrot" };
fruit.RemoveAt(0);
}
}
cpp
fruit->RemoveAt(0);
fantom
list := ["Apple", "Banana", "Carrot"]
list.removeAt(0)
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
csharp
List<string> fruits = new List() { "apple", "banana", "cherry" };
fruits.RemoveAt(fruits.Length - 1);
cpp
fruit->RemoveAt(fruit->Count - 1);
fantom
list := ["Apple", "Banana", "Carrot"]
list.removeAt(-1)
list := ["Apple", "Banana", "Carrot"]¨
list.pop
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
csharp
var lst = new LinkedList<String>(new String[] {"apple", "orange", "grapes", "banana"});
lst.AddLast(lst.First());
lst.DeleteFirst();
cpp
fruit->Add(fruit[0]); fruit->RemoveAt(0);
rotate(fruit.begin(), fruit.begin()+1, fruit.end());
fantom
list := ["apple", "orange", "grapes", "bananas"]
list.add(list.removeAt(0))
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
csharp
String[] first = { "Bruce", "Tommy Lee", "Bruce" };
String[] last = { "Willis", "Jones", "Lee" };
int[] years = { 1955, 1946, 1940 };
var actors = first.Zip(last, (f, l) => Tuple.Create(f, l)).Zip(years, (t, y) => Tuple.Create(t.Item1, t.Item2, y)).ToArray();
Debug.Assert(actors[1].Equals(Tuple.Create("Tommy Lee", "Jones", 1946)));
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));
fantom
r := [,]
first.size.times |Int i| { r.add([first[i], last[i], years[i]]) }

echo(r)
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
csharp
using System;
using System.Collections.Generic;
using System.Linq;

namespace Combinations
{
class Program
{
public static void Main(string[] args)
{
// Define the given lists
// Since List`1 implements the interface IEnumerable`1, this can easily be redefined as List`1.
IEnumerable<string> suites = new string[] { "H", "D", "C", "S" };
IEnumerable<string> faces = new string[] { "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A" };

// LINQ Query to perform a Cartesian product and create an anonymous type to hold the results.
// "var" is required to define this as an IEnumerable`1
var deck =
from suite in suites // For each suite in suites
from face in faces // Match it with a face in face.
select new
{
Suite = suite,
Face = face
};

// Verify the count (uses LINQ extension)
if (deck.Count() == 52)
{
Console.WriteLine("Count matches!");
}

// Verify that the Ace of Hearts is in the deck (uses LINQ extension)
if (deck.Contains(new {Suite = "H", Face = "A"}))
{
Console.WriteLine("Ace of Hearts found!");
}

// Example of how to iterate through the list.
// "var" here is required since we are using an anonymous type
foreach(var card in deck)
{
Console.WriteLine("Suite: {0} Face: {1}", card.Suite, card.Face);
}

// If you desire to work with a List`1, you can convert this to a normal list at any time:
Console.WriteLine("\nConverting to list!");
var list = deck.ToList();
Console.WriteLine("Suite: {0} Face: {1}", list[5].Suite, list[5].Face);
Console.WriteLine("List count: {0}", list.Count); // 52

Console.ReadLine();
}
}
}
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;
fantom
r := [,]
["2","3","4","5","6","7","8","9","10","J","Q","K","A"].each |Str c|
{ ["H","D","C","S"].each |Str s| { r.add([c,s]) } }

q := ["A","H"]
result := r.contains(q)
echo("Deck size=${r.size}, contains $q? -> $result")
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}
csharp
using System.Collections.Generic;
public class OperationOnEach {
public static void Main() {
var list = new List<string>() { "ox", "cat", "deer", "whale" };
list.ForEach( System.Console.WriteLine );
}
}
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(); });
fantom
["ox", "cat", "deer", "whale"].map { it.size }
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}
csharp
using System;
using System.Collections.Generic;
using System.Linq;

// AFAIK, there just isn't a good way to do this in C#
public class ListSplitter {
public static bool IsNumeric(object o) {
var d = new Decimal();
return decimal.TryParse(o.ToString(), out d);
}
public static void Main() {
var list = new List<object>() { "foo", DateTime.Now, 1, "bar", 2.4 };

// the Where method does the work...
var numbers = list.Where( el => IsNumeric(el) );
var nonNumbers = list.Where( el => ! IsNumeric(el) );
}

}
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'
}
fantom
things := ["hello", 25, 3.14, Time.now]
numbers := things.findType(Num#)
nonNumbers := things.exclude { numbers.contains(it) }
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;
}
fantom
echo([2,3,4].all{ it>1 })
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;
}
fantom
echo([2,3,4].any{ it==4 })
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;
fantom
map := [:]
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;
fantom
map := [:].ro
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;
fantom
map := ["circle":1, "triangle":2, "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;
fantom
map := ["joe":"cat", "mary":"turtle", "bill":"canary"]
if (map.containsKey("mary")) echo("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;
fantom
map := ["joe":"cat", "mary":"turtle", "bill":"canary"]
pet := map["joe"]
echo("pet=$pet")
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";
fantom
map["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);
}
fantom
pet := map.remove("bill")
echo ("pet=$pet")
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}
csharp
using System.Collections.Generic;
using System.Linq;

// This is a "functional" C# approach

// NOTE: In C# "maps" are of type Dictionary<Tkey, TValue>
// so our histogram map is of type Dictionary<object, int>
public class HistogramMap {
public Dictionary<object, int> FromList(List<object> list) {
// The "Aggregate" method works like "inject" in many other languages.
return list.Aggregate(
new Dictionary<object, int>(),
(map, obj) => {
// If this is the first time we've seen this obj, set the count to 0
if (!map.ContainsKey(obj)) map[obj] = 0;

// Increment the count
map[obj]++;

// Return the map for the next iteration.
// NOTE: This does NOT return from our "FromList" method
return map;
}
);
}

public static void Main() {
// Create our Histogram Map from a new list
var map = new HistogramMap().FromList(
new List<object>() { 'a', 'b', 'a', 'c', 'b', 'b' }
);

// This just prints the result
System.Console.WriteLine (
string.Join (", ",
// "Select" works like "map" or "collect" in many other languages
map.Select( kvp =>
string.Format("{0} : {1}", kvp.Key, kvp.Value)
).ToArray()
)
);
}
}
new[] {"a","b","a","c","b","b"}
.GroupBy(s => s)
.Select(s => new { Value = s.Key, Count = s.Count() })
.ToList()
.ForEach(e => Console.WriteLine("{0} : {1} ", e.Value, e.Count));
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;
fantom
list := ["a","b","a","c","b","b"]
map := [Str:Int][:]
list.each |Str s, Int i| { if(!map.containsKey(s)) map.add(s,1); else map[s] = ++map[s] }
echo (map)
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 }
csharp
using System.Collections.Generic;
using System.Linq;
public class ListCategorizer {
public static void Main() {
var list = new List<string>() { "one", "two", "three", "four", "five" };
var categories = list.GroupBy(el => el.Length)
.ToDictionary( g => g.Key, // key
g => g.ToList() ); // value
}
}
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);
}
fantom
list := ["one", "two", "three", "four", "five"]
map := [Int:List][:]
list.each { List l := map[it.size] ?: [,]; map[it.size] = l.add(it) }
echo(map)
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'
csharp
if (name == "Bob") Console.WriteLine("Hello, {0}!", name);
cpp
if (name == "Bob") Console::WriteLine("Hello, {0}!", name);
if (name == "Bob") std::cout << "Hello, " << name << "!" << std::endl;
fantom
if (name=="Bob") echo("Hello, Bob!")
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"}"
csharp
int age = 41;

if (age > 42)

System.Console.WriteLine("You are old");
else
System.Console.WriteLine("You are 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"));
fantom
if (age > 42)
echo("You are old")
else
echo("You are young")
echo((age > 42) ? "You are old" : "You are young")
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
csharp
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"));
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;
fantom
if (age > 84)
echo("You are really ancient")
else if (age > 30)
echo("You are middle-aged")
else
echo("You are young")
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) }
csharp
public static string GetOrdinal(int i)
{
if (i > 10 && i < 20) return i.ToString() + "th";
switch (i % 10)
{
case 1:
return i.ToString() + "st";
case 2:
return i.ToString() + "nd";
case 3:
return i.ToString() + "rd";
default:
return i.ToString() + "th";
}
}
public static string GetOrdinal(int i)
{
if (i > 10 && i < 20) return i.ToString() + "th";
switch (i % 10)
{
case 1:
return i.ToString() + "st";
break;
case 2:
return i.ToString() + "nd";
break;
case 3:
return i.ToString() + "rd";
break;
default:
return i.ToString() + "th";
break;
}
}
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();
}
fantom
suffix := |Int n -> Str|
{
if ((4..20).contains(n % 100))
return "th"

switch((n.toStr)[-1])
{
case '1': return "st"
case '2': return "nd"
case '3': return "rd"
default: return "th"
}
}

(1..40).each { echo("$it${suffix(it)}") }
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
csharp
int x = 1;

while (x < 150)
{
x *= 2;
Console.Write("{0},", x);
}
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;
fantom
x := 1
while (x < 150) {
Env.cur.out.print("$x,")
x *= 2
}
echo
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(",")
csharp
System.Random die = new System.Random();
int roll;

do
{
roll = die.Next(1, 6);
Console.Write(roll);
if (roll < 6) Console.Write(",");
}
while (roll != 6);
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();
fantom
rnd := 0
while(rnd != 6) {
rnd = Int.random(1..6)
Env.cur.out.print(rnd)
if (rnd != 6)
Env.cur.out.print(",")
}
echo
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" }
csharp
string text = "Hello";

for (int i = 0; i < 5; i++)
{
Console.Write(text);
}
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");
fantom
5.times { Env.cur.out.print("Hello") }
for (i := 0; i < 5; i++)
Env.cur.out.print("Hello")
(1..5).each { Env.cur.out.print("Hello") }
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!"
csharp
for (int i = 10; i > 0; i--)
{
Console.Write("{0} .. ", i);
}

Console.WriteLine("Liftoff!");
cpp
for(int i = 10; i != 0; --i) Console::Write("{0} .. ", i);
Console::WriteLine("Liftoff!");
fantom
(10..1).each { Env.cur.out.print("$it .. ") }
Env.cur.out.print("Liftoff!")
for (i := 10; i >= 1; i--)
Env.cur.out.print("$i .. ")
Env.cur.out.print("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
csharp
string contents = System.IO.File.ReadAllText("filename.txt");
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");
fantom
contents := File(`file.text`).readAllStr
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}
}
csharp
int counter = 0;

// If the file is large, you would want to buffer this instead of reading everything at once
foreach (string line in System.IO.File.ReadAllLines("filename.txt"))
{
Console.WriteLine("{0}> {1}", ++counter, 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);
fantom
File(`input.text`).readAllLines.each |Str s, Int i| { echo("${i+1}> $s") }
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"
csharp
System.IO.File.WriteAllText("filename.txt", "Some text to write to the file");
cpp
IO::StreamWriter^ stream;

try
{
stream = gcnew IO::StreamWriter("test.txt", false);
stream->WriteLine("This line overwites file contents!");
}
fantom
File(`out.txt`).out.writeChars("some text").flush
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()
csharp
System.IO.File.AppendAllText("filename.txt", "Some text to append to the file");
cpp
IO::StreamWriter^ stream;

try
{
stream = gcnew IO::StreamWriter("test.txt", true);
stream->WriteLine("This line appended to file!");
}
fantom
File(`out.txt`).out(true).writeChars("some text").flush
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}"}
csharp
foreach (string filename in System.IO.Directory.GetFiles(directory)) ProcessFile(filename);
cpp
for each(String^ filename in IO::Directory::GetFiles(dirname)) process(filename);
fantom
File(`./`).list.each { process(it) }
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:\\");
}
fantom
File(`./`).walk { process(it) }
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')
csharp
DateTime parsedDate = DateTime.Parse("2008-05-06 13:29");
// Ideally, you would catch the potential FormatException or use DateTime.TryParse in production code.
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);
fantom
dt := DateTime.fromLocale("2008-05-06 13:29", "YYYY-MM-DD hh:mm")
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
csharp
DateTime date = DateTime.Today.AddDays(8);

Console.WriteLine("Day of month: " + date.Day);
Console.WriteLine("Day of year: " + date.DayOfYear);
Console.WriteLine("Month name: " + date.ToString("MMMM"));
Console.WriteLine("Day name: " + date.ToString("dddd"));

// The two ToString calls will use the current locale.
// To get localised month and day names, see http://msdn.microsoft.com/en-us/library/8tfzyc64.aspx
cpp
QDate dateEightDaysFromNow = QDate::currentDate().addDays(8);
fantom
date := Date.today + 8day
echo(date.day)
echo(date.dayOfYear)
echo(date.month.localeFull)
echo(date.weekday.localeFull)

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.)
csharp
using System.Globalization;

DateTime newYearsDay = new DateTime(2009, 1, 1);
CultureInfo[] locales = {
CultureInfo.CreateSpecificCulture("en-US"),
CultureInfo.CreateSpecificCulture("fr-FR"),
CultureInfo.CreateSpecificCulture("de-DE"),
CultureInfo.CreateSpecificCulture("it-IT"),
CultureInfo.CreateSpecificCulture("nl-NL")
};

foreach (CultureInfo locale in locales)
{
Console.WriteLine(newYearsDay.ToString("D", locale));
}
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);
}
fantom
// May require modification of Fantom distribution t
// for undefined locales - basically just create a '<locale-name>.props' plain text file with values like this:
// sunAbbr=Sun
// ..
// sunFull=Sunday
["en", "fr", "ru"].map { Locale(it) }.each |Locale l| {
l.use { echo(Date(2009, Month.jan, 1).toLocale("WWWW, MMMM D, YYYY")) }
}
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
csharp
// Creating a variable first:
DateTime now = DateTime.Now;
Console.WriteLine(now);

// Without creating a variable:
Console.WriteLine(DateTime.Now);
cpp
QDate now = QDate::currentData();
qDebug() << now.toString();
time_t date = time(0);
cout << ctime(&date);
fantom
echo(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()
csharp
using System;

class Greeter
{
private string name {get;set;}

public void Greet(){
Console.WriteLine("Hello, {0}",name);
}

public Greeter(string name){
this.name = name;
}
}

class Test
{
static void Main()
{
new Greeter("Dante").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);
}
fantom
class Greeter
{
private Str whom
new make(Str whom) { this.whom = whom }
Void greet() { echo("Hello, $whom") }
}

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
csharp
class Greeter
{
public string Name {get;set;}

public void Greet(){
Console.WriteLine("Hello, {0}",Name);
}

public Greeter(string name){
this.Name = name;
}

// Driver
public static void Main()
{
var g = new Greeter("Dante");

g.Name = "Tommy";
g.Greet();
Console.Write("I have just greated {0}", g.Name);
}
}
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;
}
fantom
class Greeter
{
new make(Str whom) { this.whom = whom }
Void greet() { echo("Hello, $whom!") }
Str whom
}

greeter := Greeter("world")
greeter.greet
greeter.whom = "Tommy"
echo("I have just greeted ${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}

csharp
// While abstract classes do exist in C#, it is most common to use
// an interface in this type of situation.
// It is a common idiom to prefix interface names with an I
public interface IShape {
string Name { get; }
double Area { get; }
void Print();
}

public class Circle : IShape {

private double Radius { get; set; }
public Circle(double radius) {
Name = "Circle";
Radius = radius;
}

public string Name { get; private set; }
public double Area {
get {
return Math.PI * Radius * Radius;
}
}
public double Circumference {
get {
return Math.PI * (Radius + Radius);
}
}

public void Print() {
Console.WriteLine( " Name: {0}\n Area: {1}\n Circumference: {2}\n Radius: {3}",
this.Name,
this.Area,
this.Circumference,
this.Radius
);
}
}

public class Rectangle : IShape {

private double Length { get; set; }
private double Breadth { get; set; }
public Rectangle(double length, double breadth) {
Name = "Rectangle";
Length = length;
Breadth = breadth;
}

public string Name { get; private set; }
public double Area {
get {
return Length * Breadth;
}
}
public double Perimeter {
get {
return (Length * 2) + (Breadth * 2 );
}
}

public void Print() {
Console.WriteLine( " Name: {0}\n Area: {1}\n Perimeter: {2}\n Length: {3}\n Breadth: {4}",
this.Name,
this.Area,
this.Perimeter,
this.Length,
this.Breadth
);
}
}

// Driver
public class InheritanceHeirarchy {
public static void _Main() {
var c = new Circle(2.1);
c.Print();

Console.WriteLine();

var r = new Rectangle(2.2, 3.3);
r.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();
}
fantom
abstract class Shape
{
const Str name
new make(Str name) { this.name = name }
abstract Float area()
abstract Void print()
}

class Circle : Shape
{
private Float radius

new make(Float radius) : super("circle") { this.radius = radius }
Float circumference() { return 2 * Float.pi * radius }
override Float area() { return Float.pi * radius.pow(2.0f) }
override Void print()
{
echo("I am a $name with radius $radius, area $area
and circumference $circumference")
}
}

class Rectangle : Shape
{
private Float length
private Float breadth

new make(Float length, Float breadth) : super("rectangle")
{
this.length = length
this.breadth = breadth
}
Float perimeter() { return 2 * (length + breadth) }
override Float area() { return length * breadth }
override Void print()
{
echo("I am a $name with length $length, breadth $breadth,
area $area and perimeter $perimeter")
}
}


circle := Circle(4.0f)
circle.print
rectangle := Rectangle(2.0f, 5.5f)
rectangle.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;
}
fantom
@Serializable
class Person
{
Str name
Int age
new make(|This| f) { f(this) }
}

person := Person() { name="Tom Bones"; age=23 }
File(`tommy.dump`).out.writeObj(person).close
Person tom := File(`tommy.dump`).in.readObj
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);
fantom
language := "Fantom"
url := `http://langref.org/`

response := WebClient(url).getStr
if (Regex.fromStr("\\b$language.lower\\b").matcher(response).find)
echo("Language $language appears at ${url}.")
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
fantom
// read message body
echo("Enter message body. End the message with '.' character on a separate line:")
in := Env.cur.in
buf := StrBuf()
line := in.readLine;
while (line != null)
{
if (line.trim == ".")
break;
buf.add(line)
line = in.readLine
}

// construct email
email := Email
{
to = [ "someone@somewhere" ]
from = "me@mydomain"
subject = "Greetings from langref.org"
body = TextPart { text = buf.toStr }
}
mailClient := SmtpClient
{
host = "smtp.somewhere.net"
username = "me"
password = "my password"
log.level = LogLevel.debug
}

// send or abort
echo("Send email '$email.subject' to $email.to?: ");
line = in.readLine
echo("response=$line")
if (line?.trim.compareIgnoreCase("y") == 0)
mailClient.send(email)
else
echo("Aborted!")
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
csharp
System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
doc.LoadXml(
@"<shopping>
<item name='bread' quantity='3' price='2.50'/>
<item name='milk' quantity='2' price='3.50'/>
</shopping>");

string decimalSeparator= System.Globalization.CultureInfo.CurrentCulture.NumberFormat.CurrencyDecimalSeparator;

double sum=0;

foreach(System.Xml.XmlNode nodo in doc.SelectNodes("/shopping/item")){
sum += int.Parse(nodo.Attributes["quantity"].InnerText) * double.Parse(nodo.Attributes["price"].InnerText.Replace(".",decimalSeparator));
}
Console.WriteLine("{0:#.00}",sum);
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 $" << setprecision(2) << total_price << endl;
fantom
sum := 0.0
root := XParser(File(`shop.xml`).in).parseDoc.root
if (root.name == "shopping")
{
root.elems.each
{
if (it.name == "item")
{
quantity := Int.fromStr(it.get("quantity"))
price := Decimal.fromStr(it.get("price"))
sum += quantity * price;
}
}
}
echo("\$$sum")
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
csharp
string cvs ="bread,3,2.50\nmilk,2,3.50";
IList<string> rows = cvs.Split('\n');

System.Text.StringBuilder sb = new System.Text.StringBuilder("<shopping>");
foreach(string row in rows){
IList<string> data = row.Split(',');
sb.AppendFormat("<item name='{0}' quantity='{1}' price='{2}' />",data[0],data[1],data[2]);
}
sb.Append("</shopping>");
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;
fantom
sum := 0.0
rows := CsvInStream(File(`shop.csv`).in).readAllRows

doc := XDoc()
doc.root = XElem("shopping")
{
root := it
rows.each |Str[] row|
{
root.add(XElem("item")
{
XAttr("name", row[0]),
XAttr("quantity", row[1]),
XAttr("price", row[2])
})
}
}

os := File(`shop.xml`).out
doc.write(os)
os.close
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;
fantom
triangles := [,]
(1..20).each |Int a|
{
(a..20).each |Int b|
{
c := (a.pow(2) + b.pow(2)).toFloat.sqrt
if (c % c.toInt == 0.0f && !triangles.contains([b,a,c]))
triangles.add([a,b,c.toInt])
}
}
triangles.sort |Int[] x, Int[] y -> Int| { x[2]-y[2] }
echo(triangles)
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
csharp
public static int gcd(int a, int b)
{
if (b == 0)
return a;
else
return gcd(b, a % b);
}
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;
}
fantom
gcd := |Int a, Int b -> Int| {
pair := [a, b].sort
while (pair.first != 0)
pair.set(1, pair.last % pair.first).swap(0, 1)
return pair.last
}
echo(gcd(12, 8)) // a>b, result == 4
echo(gcd(1029, 1071)) // a<b, result == 21
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")) }
fantom
class Q
{
static Void main()
{
r := "class Q\n{\n static Void main()\n {\n r := "
s := "\n s := \n echo (r+r.toCode+s[0..9]+s.toCode+s[10..-1])\n }\n}"
echo (r+r.toCode+s[0..9]+s.toCode+s[10..-1])
}
}
class Q{static Void main(){s:="class Q{static Void main(){s:=;c:=34.toChar;echo(s[0..<30]+c+s+c+s[30..-1]);}}";c:=34.toChar;echo(s[0..<30]+c+s+c+s[30..-1]);}}
Parallel
Pool of Workers

Subdivide A Problem To A Pool Of Workers (No 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 no need for shared state between worker threads while the problem is being solved. Only after every thread completes computation are the answers recombined into a single output.

Example:

-Input-

(In python syntax)

["ab", "we", "tfe", "aoj"]

In other words, a list of random strings.

-Output-

(In python syntax)

[ ["ab", "ba", "aa", "bb", "a", "b"], ["we", "ew", "ww", "ee", "w", "e"], ...

In other words, all possible permutations of each input string are computed.
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;
fantom
using concurrent

// as per Java answer, doesn't duplicate chars from input string, i.e. no 'aa'
const class PermGen : Actor
{
new make(ActorPool pool) : super(pool) {}

Void permutations(Str prefix, Str w, Str[] pset)
{
n := w.size
if (n == 0)
{
if (!pset.contains(prefix))
pset.add(prefix)
return
}
n.times { permutations(prefix + w[it..it], w[0..<it] + w[it+1..<n], pset) }
}

override Obj? receive(Obj? msg)
{
Str word := msg
wordSubPerm := Str[,]
for (Int i := 0; i < word.size; i++)
for (Int j := i; j < word.size; j++)
permutations("", word[i..j], wordSubPerm)
return wordSubPerm
}
}

class SolutionXX
{
static Void main()
{
pool := ActorPool() { maxThreads = 8 }
futures := Future[,]
["ab", "we", "tfe", "aoj"].each { futures.add(PermGen(pool).send(it)) }
futures.each { echo(it.get) }
}
}

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.
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;
}
}
fantom
pool := ActorPool()
["one", "two", "three", "four"].each
{
a := Actor(pool) |Str name| { echo("Thread $name says Hello World!") }
a.send(it)
}
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")();
}

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();
}
fantom
using concurrent
class Main
{
static Void main()
{
worker := Actor(ActorPool()) |Str s|
{
result := permute(s.chars).map { Str.fromChars(it) }
echo("Done Work On $s!")
echo(result)
}

Env.cur.out.writeChars("Hello, user! Please input a string to permute: ").flush
Env.cur.in.eachLine |line| {
echo("Passing on $line ...")
worker.send(line)
Env.cur.out.writeChars("Please input another string to permute: ").flush
}
}

static Obj[][] permute(Obj[] list, Obj[] prefix := [,])
{
list.isEmpty ?
[prefix] :
list.reduce([,]) |Obj[] r, Obj item, Int i -> Obj[]| {
r.addAll(permute(list.dup { removeAt(i) }, prefix.dup.add(item)))
}
}
}
i18n
i18n-helloworld
coach wallet
180
ÊÖ¹¤±ùä¿ÁÜ
180

180


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<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 Ã  encolure en V Ã  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 Ã  encolure en V Ã  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 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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 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<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/> 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<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 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class=<code>"imgLinkAdditional "</code>>larger image<<code>/span></</code>a><<code>/noscript></</code>div><br/> <div class=<code>"additionalImages centeredContent back"</code> style=<code>"width:33%; "</code>><br/> <br/> <noscript><a href=<code>"http://www.kissdrdrebeats.com/2011-monster-beats-studio-transformers-c-8.html"</code> target=<code>"_blank "</code>> <a href=<code>"http://www.kissdrdrebeats.com/2011-monster-beats-studio-transformers-c-8.html"</code> ><img src=<code>"http://www.kissdrdrebeats.com/images/monsterbeats/MonsterBeatsByDr.DreTransformersLimitedEditionHeadphones_009.jpg"</code> alt=<code>"2011 Monster Beats By Dr. Dre Transformers Limited Edition Headphones"</code> title=<code>" 2011 Monster Beats By Dr. Dre Transformers Limited Edition Headphones "</code> width=<code>"100"</code> height=<code>"75"</code> style=<code>"position:relative"</code> onmouseover=<code>"showtrail('images/monsterbeats//MonsterBeatsByDr.DreTransformersLimitedEditionHeadphones_009.jpg','2011 Monster Beats By Dr. Dre Transformers Limited Edition Headphones',100,75,600,450,this,0,0,100,75);"</code> onmouseout=<code>"hidetrail();"</code> <code>/></</code>a><br <code>/><span class="imgLinkAdditional ">larger image</</code>span><<code>/a></</code>noscript><<code>/div><br/><br class="clearBoth" /</code>> <br/> <br/> <div class=<code>"additionalImages centeredContent back"</code> style=<code>"width:33%; "</code>><br/> <br/> <noscript><a href=<code>"http://www.kissdrdrebeats.com/2011-monster-beats-studio-transformers-c-8.html"</code> target=<code>"_blank "</code>> <a href=<code>"http://www.kissdrdrebeats.com/2011-monster-beats-studio-transformers-c-8.html"</code> ><img src=<code>"http://www.kissdrdrebeats.com/images/monsterbeats/MonsterBeatsByDr.DreTransformersLimitedEditionHeadphones_010.jpg"</code> 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