langref.org - perl, cpp, and csharp

All Problems

Strings

Printing

Output a string to the console

Write the string "Hello World!" to STDOUT

perl

print "Hello World!\n"

cpp

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

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

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

csharp

System.Console.WriteLine("Hello World!")

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?

perl

print "http://myserver.com/custinfo/edit.php"
."?fname=".urlenc('Ron & Jean')
."&lname=".urlenc('Smith');
sub urlenc{my($s)=@_;$s=~s/([^A-Za-z0-9])/sprintf("%%%02X",ord($1))/seg;$s}

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();

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.

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);
}

Declaration

Define a string containing special characters

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

perl

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

$special = q(\#{'}${"}/);

cpp

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

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

csharp

string verbatim = @"\#{'}${""""}/";
string cStyle = "\\#{'}${\"\"}/";

Define a multiline string

Define the string:

"This

Is

A

Multiline

String"

perl

$text = 'This
Is
A
Multiline
String';

$text = <<EOF;
This
Is
A
Multiline
String
EOF

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";

csharp

string output = "This\nIs\nA\nMultiline\nString";

string output = @"This
Is
A
Multiline
String";

Define a string containing variables and expressions

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

perl

print "$a+$b=${\($a+$b)}\n";

sprintf("%d+%d=%d", $a, $b, $a + $b);

print $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;

csharp

int a = 3;
int b = 4;
Console.WriteLine("{0}+{1}={2}", a,b,a+b);

Manipulation

Reverse the characters in a string

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

perl

$_ = reverse "reverse me"; print

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());

csharp

var str = "reverse me";
Console.WriteLine(new String(str.Reverse().ToArray()));

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"

perl

$reversed = join ' ', reverse split / /, $text;

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();

csharp

var str = "This is a end, my only friend!";
str = String.Join(" ", str.Split().Reverse().ToArray());
Console.WriteLine(str);

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.

perl

use Text::Wrap;
$text = "The quick brown fox jumps over the lazy dog. ";
$Text::Wrap::columns = 73;
print wrap('> ', '> ', $text x 10);

$_ = "The quick brown fox jumps over the lazy dog. " x 10;
s/(.{0,70}) /> $1\n/g;
print;

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);
}

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));
}
}

Remove leading and trailing whitespace from a string

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

perl

my $string = " hello ";
$string =~ s{
\A\s* # Any number of spaces at the start of the string
(.+?) # Remember any number of characters until we reach
\s*\z # any number of spaces at the end of the string
}{
$1 # Leave the characters we remembered
}x;

my $string = " hello ";
$string =~ s{\A\s*}{};
$string =~ s{\s*\z}{};

#Modification History:
# 2009-MAR-17: GGARIEPY: [creation] (geoff.gariepy@gmail.com)

$string = " hello ";
$string =~ s/^\s+|\s+$//g; # All the action happens in one regex!

# Regex Notes:
# ^ - anchors to the beginning of the string
# $ - anchors to the end of the string
# g - causes regex to match as many times as possible
# | - logical OR

cpp

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

csharp

string str = " hello ";
str = str.Trim();
Console.WriteLine(str);

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

perl

sub rot13 {
my $str = shift;
$str =~ tr/A-Za-z/N-ZA-Mn-za-m/;
return $str;
}

sub rot47 {
my $str = shift;
$str =~ tr/!-~/P-~!-O/;
return $str;
}

my $string = 'Hello World #123';

print "$string\n";
print rot13($string)."\n";
print rot47($string)."\n";

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;
}

Case

Make a string uppercase

Transform "Space Monkey" into "SPACE MONKEY"

perl

print uc "Space Monkey"

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);

csharp

string output = "Space Monkey"

System.Console.WriteLine(output.ToUpper())

Make a string lowercase

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

perl

print lc "Caps ARE overRated"

cpp

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

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

csharp

string str = "Caps ARE overRated";
str = str.ToLower() ;
Console.WriteLine(str);

Capitalise the first letter of each word

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

perl

$text =~ s/(\w+)/\u\L$1/g;

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();

csharp

System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo.ToTitleCase("man OF stEEL".ToLowerInvariant());

Numbers

Mathematical

Find the distance between two points

perl

use Math::Complex;
$a = Math::Complex->make(0, 3);
$b = Math::Complex->make(4, 0);
$distance = abs($a - $b);

cpp

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

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)));

Output

Zero pad a number

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

perl

sprintf("%08d", 42);

cpp

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

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

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

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

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

csharp

string.Format("{0,8:D8}", 42);

Right Space pad a number

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

perl

sprintf("%-6d", 1024);

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;

csharp

public class NumberRightPadding {
public static void Main() {
string withStringDotFormat = string.Format("{0,-6}", 1024);
string withToStringDotPadRight = 1024.ToString().PadRight(6);
}
}

Format a decimal number

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

perl

sprintf("%.2f", 7/8);

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;

csharp

public class FormatDecimal {
public static void Main() {
decimal result = decimal.Round( 7 / 8m, 2);
System.Console.WriteLine(result);
}
}

Left Space pad a number

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

perl

sprintf("%10d", 73);

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;

csharp

public class NumberLeftPadding {
public static void Main() {
string withStringDotFormat = string.Format("{0,10}", 73);
string withToStringDotPadLeft = 73.ToString().PadLeft(10);
}
}

Random

Generate a random integer in a given range

Produce a random integer between 100 and 200 inclusive

perl

my $range = 100;
my $minimum = 100;

my $random_number = int(rand($range)) + $minimum;

print "$random_number\n";

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();

csharp

System.Random r = new System.Random();
int random = r.Next(100,201);

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.

perl

srand(12345);
@list1 = map(int(rand(100)+1), (1..5));

srand(12345);
@list2 = map(int(rand(100)+1), (1..5));

print join(', ', @list1) . "\n";
print join(', ', @list2) . "\n";

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);

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());
}
}

Regex

Matching

Check if a string matches a regular expression

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

perl

print 'ok' if ('Hello' =~ /[A-Z][a-z]+/);

cpp

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

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

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

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

csharp

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

Check if a string matches with groups

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

perl

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

cpp

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

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

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]);
}
}

Searching

Check if a string contains a match to a regular expression

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

perl

print "ok" if ("abc 123 @#\$" =~ m/\d+/)

cpp

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

csharp

if(System.Text.RegularExpressions.Regex.IsMatch("abc 123 @#$",@"\d+")){
Console.WriteLine("ok");
}

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+)/

perl

while ($text =~ /$(\w+)$:(\d+)/g) {
push @list, "$1$2"
}

cpp

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

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

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;});
}
}

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 "*"

perl

$text =~s/e/*/;

cpp

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

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"

perl

$text = "She sells sea shells";
$text =~ s/se\w+/X/g;

cpp

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

String^ Replaced = Regex::Replace("She sells sea shells", "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");
}
}

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+)\}/.

perl

$text = "The {Quick} Brown {Fox}";
$text =~ s/\{(\w+)\}/reverse($1)/ge;

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));

Lists

Declaration

Define an empty list

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

perl

@list = ();

cpp

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

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

csharp

var list = new List<object>();

Define a static list

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

perl

@list = qw(One Two Three Four Five);

@list = ('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";

csharp

IList<string> list = new string[]{"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"

perl

print join ', ', qw(Apple Banana Carrot);

# Longer and less efficient than join(), but illustrates
# Perl's foreach operator, which can be useful for
# less trivial problems with lists

@list = ('Apple', 'Banana', 'Carrot');
foreach $fruit (@list) {
print "$fruit,";
}
print "\n";

my @a = qw/Apple Banana Carrot/;
{
local $, = ", ";
print @a
}
print "\n";

my @a = qw/Apple Banana Carrot/;
{
local $" = ", ";
print "@a\n";
}

cpp

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

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

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()) );
}
}

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([]) = ""

perl

sub myjoin {
$_ = join ', ', @_;
s/, ([^,]+)$/ and $1/;
return $_;
}

# Note: I don't think this meets the spec --Geoff

sub myjoin {
if ($#_ < 2) {
return join ' and ', @_;
} else {
return join(', ', @_[0..$#_-1]) . ' and ' . $_[-1];
}
}

# Note: I don't think this meets the spec --Geoff

# Previous "myjoin()" responses don't meet the spec of including
# the final comma before the "and" if the list has more than
# two elements...this is one way to meet that spec...it may
# not be the most efficient...

sub AnotherMyJoin {
my @list = @_;

if ($#list == -1) {return}
elsif ($#list == 0) {return $list[0]}
elsif ($#list == 1) {return $list[0].' and '.$list[1]}
else {
return join(", ", @list[0..$#list - 1]) . ', and '. $list[$#list];
}
}

# This is the long way, but it's kind of fun
# It illustrates the use of Perl's reverse()
# operator to work our way through the list
# elements backwards...I wrote this one before
# getting smart and looking at some of the other
# algorithms from the other languages. Still,
# it is only 12 lines of code vs 9 for my other
# solution if you disregard the comments.

sub myjoin {
my @list = reverse(@_); # Reverse original order of elements
my $retval;

# Make our exit here if we were passed an empty list
if ($#list == -1) {return}

# Loop through reversed elements in end-to-start order
for (0..$#list) {
# Add the reversed form of each element plus a space char
$retval .= reverse($list[$_]).' ';

# Add 'and' to lists with two or more elements
# placing it in between final and 'next to final'
$retval .= "dna " if ($#list > 0 and $_== 0);

# Add ',' to each element as long as there are more
# than two elements and the current element isn't the
# final element
$retval .= "," if ($#list > 1 and $_ != $#list);
}

# Remove what will end up as an extraneous leading space
chop($retval);

# Done looping, now reverse things back into correct order and return
$retval = reverse($retval);
return($retval);
}

# Yes, this doesn't meet the spec, the spec is flawed
# the serial comma (Oxford comma) is not required in a list
sub english_join {
return join(', ', @_[0..$#_-1])
. ($#_ ? ' and ' : '' )
. $_[-1];
}

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);
}
}

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>()) );
}
}

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]]

perl

@letters = qw(a b c);
@numbers = (4, 5);
@list = map { $number=$_; map [$_, $number], @letters; } @numbers;

@letters = qw(a b c);
@numbers = (4, 5);

for $number (@numbers) {
for $letter (@letters) {
push @list, [$letter, $number];
}
}

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;

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 });
}
}
}
}

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"]

perl

my @input = ("andrew", "bob", "chris", "bob", "bob");

my %input_count;
my @output = grep { $input_count{$_}++; $input_count{$_} == 2 } @input;

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;

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);
}

Access

Fetch an element of a list by index

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

perl

qw(One Two Three Four Five)[2];

@list = qw(One Two Three Four Five);
$list[2];

cpp

String^ result = list[2];

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

Fetch the last element of a list

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

perl

qw(Red Green Blue)[-1];

@list = qw(Red Green Blue);
$list[-1];

cpp

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

string last_elem = lst.back();

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"

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?

perl

@beans = qw(broad mung black red white);
@colors = qw(black red blue green);
@seen{@beans} = ();
for (@colors) {
push(@intersection, $_) if exists($seen{$_});
}
print join(', ', @intersection);

@beans = qw(broad mung black red white);
@colors = qw(black red blue green);

my %colors_hash = map { $_ => 1 } @colors;
my @intersection = grep { $colors_hash{$_} } @beans;
print join(', ', @intersection),"\n";

@beans = qw/broad mung black red white/;
@colors = qw/black red blue green/;

print join ', ', grep { $_ ~~ @colors } @beans;

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);

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']

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.

perl

@ages = (18, 16, 17, 18, 16, 19, 14, 17, 19, 18);
@seen{@ages} = ();
@unique = keys %seen;
print join(', ', @unique);

@ages = (18, 16, 17, 18, 16, 19, 14, 17, 19, 18);
@unique = grep(!$seen{$_}++, @ages);
print join(', ', @unique);

@ages = (18, 16, 17, 18, 16, 19, 14, 17, 19, 18);
print join(', ', grep(!$seen{$_}++, @ages));

@ages = (18, 16, 17, 18, 16, 19, 14, 17, 19, 18);
for (@ages) {
push(@unique, $_) unless $seen{$_}++;
}
print join(', ', @unique);

use List::MoreUtils qw(uniq);

@ages = (18, 16, 17, 18, 16, 19, 14, 17, 19, 18);
print join(', ', uniq(@ages));

cpp

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

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

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

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();
}
}

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]

perl

@list = qw(Apple Banana Carrot);
shift @list;

@list = qw(Apple Banana Carrot);
$offset = 0;
splice(@list, $offset, 1);

cpp

fruit->RemoveAt(0);

csharp

class Solution1516
{
static void Main()
{
List<string> fruit = new List<string>() { "Apple", "Banana", "Carrot" };
fruit.RemoveAt(0);
}
}

Remove the last element of a list

perl

pop @list;

cpp

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

csharp

List<string> fruits = new List() { "apple", "banana", "cherry" };
fruits.RemoveAt(fruits.Length - 1);

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"]

perl

@list = qw(apple, orange, grapes, bananas);
push @list, shift @list;

@list = qw(apple orange grapes bananas);
@list = @list[1..$#list,0];

cpp

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

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

csharp

var lst = new LinkedList<String>(new String[] {"apple", "orange", "grapes", "banana"});
lst.AddLast(lst.First());
lst.DeleteFirst();

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.

perl

my @first = ('Bruce', 'Tommy Lee', 'Bruce');
my @last = ('Willis', 'Jones', 'Lee');
my @years = (1955, 1946, 1940);

my @actors;

my $max = scalar @first;
for my $index (0 .. $max) {
push @actors, [ $first[$index], $last[$index], $years[$index] ];
};

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));

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)));

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'.

perl

@suites = qw(H D C S);
@faces = qw(2 3 4 5 6 7 8 9 10 J Q K A);
@deck = map { $suite=$_; map $suite.$_, @faces; } @suites;
print 'checking deck size: ' . (@deck == 52 ? 'pass' : 'fail') . "\n";
print 'deck contains "Ace of Hearts": ' . (grep(/^HA$/, @deck) ? 'true' : 'false') . "\n";

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;

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();
}
}
}

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]

perl

my @list = qw{ox cat deer whale};

my @lengths = map {length($_)} @list;

print "@list\n";
print "@lengths\n";

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(); });

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 );
}
}

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.

perl

use Scalar::Util qw(looks_like_number);
my @things = ('hello',25,3.14,scalar(localtime(time)));
my @numbers;
my @others;
for ( @things ) {
if ( looks_like_number $_ ) {
push @numbers, $_;
} else {
push @other, $_;
}
}

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'
}

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) );
}

}

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.

cpp

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

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.

cpp

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

Maps

Declaration

Define an empty map

perl

# %map = {}
# This was wrong, that would have created a hash with one key
# of the stringified hash reference (HASH(0xNUMBERSHERE)) and a
# value of 'undef', as well as triggering a
# "Reference found where even-sized list expected" with the warnings
# pragma enabled

my %map;

cpp

Hashtable^ hash = gcnew Hashtable;

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

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

Define an unmodifiable empty map

perl

# perl does not provide unmodifiable maps/hashes, but you could use "constant
# functions", if you really need them
# 2011-07-06 Not actually true, see Hash::Util::lock_hash;

sub MAP () { {} }

use Hash::Util qw/lock_hash/;
# two lines
my %hash;
lock_hash(%hash);
# or in one line
lock_hash(my %locked_hash);

cpp

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

Define an initial map

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

perl

%map = (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;

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"

perl

%pets = (joe => 'cat', mary => 'turtle', bill => 'canary');
print 'ok' if ($pets{'mary'});

%pets = (joe => 'cat', mary => 'turtle', bill => 'canary');
print 'ok' if $pets{'mary'};

print 'ok' if $pets{mary};

print 'ok' if exists $pets{mary}

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;

Retrieve a value from a map

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

perl

%pets = (joe => 'cat', mary => 'turtle', bill=>'canary');
print $pets{joe};

cpp

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

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

Add an entry to a map

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

perl

$pets{rob} = 'dog';

cpp

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

pets["rob"] = "dog";

Remove an entry from a map

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

perl

print delete $pets{bill};

cpp

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

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

perl

foreach(@list) {
$histogram{$_}++;
}

$histogram{$_}++ for @list;

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;

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));

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

perl

@list = qw(one two three four five);
push @{$map{length($_)}}, $_ for (@list);

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);
}

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
}
}

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.

perl

if ($name eq "Bob") {
print "Hello, Bob!"
}

print "Hello, Bob!" if $name eq "Bob";

cpp

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

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

csharp

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

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"

perl

if ($age > 42) {
print "You are old"
}
else {
print "You are young"
}

print 'You are ',($age > 42) ? 'old' : 'young';

cpp

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

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

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

csharp

int age = 41;

if (age > 42)

System.Console.WriteLine("You are old");
else
System.Console.WriteLine("You are young");

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

perl

if ($age > 84) {
print "You are really ancient";
} elsif ($age > 30) {
print "You are middle-aged";
} else {
print "You are young";
}

print 'You are ',
$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;

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"));

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

perl

sub suffix {
my $n = shift;

return 'th' if $n % 100 >= 4 && $n % 100 <= 20;
return 'st' if $n % 10 == 1;
return 'nd' if $n % 10 == 2;
return 'rd' if $n % 10 == 3;
return 'th';

}

foreach my $n (1..40) {
print $n.suffix($n)."\n";
}

cpp

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

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;
}
}

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.

perl

my $x = 1;
while($x < 150) {
print $x, ",";
$x *=2
}

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;

csharp

int x = 1;

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

perl

do {
my $number = int(rand(6)+1);
print $number;
print ',' if ($number != 6);
} while ($number != 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();

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);

Perform an action a fixed number of times (FOR)

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

perl

print "Hello" x 5

print "Hello" for (1..5)

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");

csharp

string text = "Hello";

for (int i = 0; i < 5; i++)
{
Console.Write(text);
}

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!"

perl

for (my $i = 10; $i > 0; $i--) {
print "$i .. ";
}
print "Liftoff!";

print "$_ .. " for reverse 1..10;
print "Liftoff!";

cpp

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

csharp

for (int i = 10; i > 0; i--)
{
Console.Write("{0} .. ", i);
}

Console.WriteLine("Liftoff!");

Files

Reading

Read the contents of a file into a string

perl

@file = read()

open(my $fh, '<', $path) or die "can't open $path: $!";
$string = do { local $/; <$fh> };
close $fh;

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");

csharp

string contents = System.IO.File.ReadAllText("filename.txt");

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

perl

open(my $fh, '<', $path) or die "can't open $path: $!";
$c = 1;
print $c++ . "> $_" for (<$fh>);
close $fh;

open my $fh, '<', $path or die "Can't open $path: $!";
while (<$fh>) {
print "$.> $_";
}

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);

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);
}

Writing

Write a string to a file

perl

open(my $fh, '>', $path) or die "can't open $path: $!";
print $fh "This line overwites file contents!";
close $fh;

cpp

IO::StreamWriter^ stream;

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

csharp

System.IO.File.WriteAllText("filename.txt", "Some text to write to the file");

Append to a file

perl

open(my $fh, '>>', $path) or die "can't open $path: $!";
print $fh "This line is appended to the file!";
close $fh;

cpp

IO::StreamWriter^ stream;

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

csharp

System.IO.File.AppendAllText("filename.txt", "Some text to append to the file");

Directories

Process each file in a directory

perl

use File::Glob;

for (<*>) {
process_file($_) if (-f);
}

cpp

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

csharp

foreach (string filename in System.IO.Directory.GetFiles(directory)) ProcessFile(filename);

Process each file in a directory recursively

perl

use File::Glob;

process_directory(".");

sub process_directory {
my $dir = shift;
for my $file (<$dir/*>) {
next unless (-r $file);
if (-f $file) {
process_file($file);
} elsif (-d $file) {
process_directory($file);
}
}
}

use File::Find ();

# Traverse desired filesystems
sub process_directory {
my $directory = shift;
File::Find::find({wanted => \&wanted}, $directory);
}

sub wanted {
process_file( $File::Find::name );
}

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:\\");
}

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.

perl

#! /usr/bin/perl
# -*- Mode: CPerl -*-

use strict;
use POSIX;

# 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.

my $ds = "2008-05-06 13:29";

my $y;
my $m;
my $d;
my $hr;
my $mn;

print "Original: ",$ds,"\n";

if ( $ds =~ /(\d{4})-(\d{2})-(\d{2})\s+(\d{2}):(\d{2})/ ){
$y = $1 - 1900;
$m = $2;
$d = $3;
$hr = $4;
$mn = $5;

printf "Nominal: %s\n",
strftime("%e %B, %Y %l:%M:%S%P",0, $mn , $hr, $d, $m,$y);

my $eth = "";
if ( $d == 1 ){
$eth = "st";
} elsif ( $d == 2 ){
$eth = "nd";
} elsif ( $d == 3 ){
$eth = "rd";
} else {
$eth = "th";
}

printf "As required: %d%s %s\n",$d,$eth,
strftime("%B, %Y %l:%M:%S%P",0, $mn , $hr, $d, $m,$y);
}

#eos

# Shurely you mean 6th MAY? If not, oh well
use Time::Piece;

my $dt_str = '2008-05-06 13:29';
my $tp = Time::Piece->strptime( $dt_str, '%Y-%m-%d %H:%M');
print $tp,"\n";

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);

csharp

DateTime parsedDate = DateTime.Parse("2008-05-06 13:29");
// Ideally, you would catch the potential FormatException or use DateTime.TryParse in production code.

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.

perl

#! /usr/bin/perl
# -*- Mode: CPerl -*-

use strict;
use Date::Calc qw(:all);

my $days_in_future = $ARGV[0];
$days_in_future = 8 unless $days_in_future;

my ($year,$month,$day, $hour,$min,$sec, $doy,$dow,$dst) = Localtime();

my ($fyear,$fmonth,$fday) = Add_Delta_Days($year,$month,$day,$days_in_future);

printf "Now: %d-%2.2d-%2.2d %2.2d:%2.2d:%2.2d\n",
$year,$month,$day,$hour,$min,$sec;

printf "Then: %d-%2.2d-%2.2d %2.2d:%2.2d:%2.2d\n",
$fyear,$fmonth,$fday,$hour,$min,$sec;

printf "Then: day of month: %d\n",$fday;
printf "Then: day of year: %d\n",Day_of_Year($fyear,$fmonth,$fday);
printf "Then: day of name: %s\n",
Day_of_Week_to_Text(Day_of_Week($fyear,$fmonth,$fday));
printf "Then: month name: %s\n",Month_to_Text($fmonth);

#eos

use Time::Piece;
use Time::Seconds;

my $t = localtime;
my $t_8 = $t + (ONE_DAY * 8);

printf "Now: %d, %d, %s, %s\n",
$t->day_of_month, $t->day_of_year, $t->fullmonth, $t->fullday;

printf "Then: %d, %d, %s, %s\n",
$t_8->day_of_month, $t_8->day_of_year, $t_8->fullmonth, $t_8->fullday;

cpp

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

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

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.)

perl

#!/usr/bin/perl
use warnings;
use strict;

use locale;
use POSIX qw(strftime);
use Time::Local;

my $date=timegm(0,0,0, 1,0,101); #00:00:00 01/01/2001

my $str_time = strftime "%c", gmtime;

print "Date: $str_time\n";

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);
}

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));
}

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.

perl

use Class::Date;
my $date = Class::Date->now();
print $date->string()."\n";

print localtime()."\n";

use Time::Piece ();

# Date object
my $date = Time::Piece::localtime;
print "$date\n";
# no object
print scalar(localtime),"\n";

cpp

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

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

csharp

// Creating a variable first:
DateTime now = DateTime.Now;
Console.WriteLine(now);

// Without creating a variable:
Console.WriteLine(DateTime.Now);

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.

perl

{ package Greeter;
sub new {
my $self = {};
my $type = shift;
$self->{'whom'} = shift;
bless $self, $type;
}

sub greet {
my $self = shift;
print "Hello " . $self->{'whom'} . "!\n";
}
}

my $greeter = Greeter->new("world");
$greeter->greet();

{
package Greeter;

sub new {
my $class = shift;
my $whom = shift or die 'Need a name to greet';
bless \$whom, $class;
}

sub greet {
my $self = shift;
print "Hello $$self!\n";
}
}

my $greeter = Greeter->new("Bob");
$greeter->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);
}

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();
}
}

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.

perl

package Greeter;
sub new {
my ($class, $whom) = @_;
bless {whom => $whom}, $class;
}
sub whom {
my ($self, $whom) = @_;
if ($whom) { $self->{whom} = $whom; }
else { return $self->{whom} }
}
sub greet {
my ($self) = @_;
my $whom = $self->{whom};
print "Hello, $whom!\n";
}
package main;

my $g = new Greeter ("world");
$g->greet;

$g->whom("Tommy");
$g->greet;
print "I have just greeted " . $g->whom . "\n";

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;
}

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);
}
}

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.

perl

package Shapes;

use MooseX::Declare;

class Shape {
use MooseX::ABC;
requires qw/area print/;
has 'name' => (is => 'ro', isa => 'Str', default => '', required => 0, init_arg => undef );

}

class Circle extends Shape {
use constant PI => 4 * atan2(1, 1);

has '+name' => ( default => 'circle' );
has 'radius' => (is => 'ro', isa => 'Num', required => 1, init_arg => 'r' );

sub area { PI * ( $_[0]->radius ** 2 ) }
sub circumference { 2 * PI * ( $_[0]->radius ** 2 ) }

sub print {
my $self = shift;

printf <<"END_OF_BLOCK", map { $self->$_ } qw/name radius area circumference/;
I am a '%s' with
Radius: %.2f
Area: %.2f
Circumference: %.2f
END_OF_BLOCK

}

}

class Rectangle extends Shape {

has '+name' => ( default => 'rectangle' );
has 'length' => (is => 'ro', isa => 'Num', required => 1, init_arg => 'l' );
has 'breadth' => (is => 'ro', isa => 'Num', required => 1, init_arg => 'b' );

sub area { $_[0]->length * $_[0]->breadth }
sub perimeter { 2 * ( $_[0]->length + $_[0]->breadth ) }

sub print {
my $self = shift;

printf <<"END_OF_BLOCK", map { $self->$_ } qw/name length breadth area perimeter/;
I am a '%s' with
Length, Width: %.2f, %.2f
Area: %.2f
Perimeter: %.2f
END_OF_BLOCK

}

}

1;

package main;

my @shapes = ( Circle->new( r => 4.2 ), Rectangle->new(l => 2.7, b => 3.1),
Rectangle->new(l => 6.2, b => 2.6), Circle->new( r => 17.3) );
$_->print for @shapes;

{
package Shapes;

sub new {
my $class = shift;
die 'Invalid parameters' if (@_ % 2);
my %parameters = @_;
die 'Missing name' unless defined $parameters{name};
bless \%parameters, $class
}

sub area {
die
'area() method must be implemented by ',__PACKAGE__.' subclasses';
}
sub print {
my $self = shift;
printf "Name: \t%s\n", $self->{name};
printf "Area: \t%.2f\n", $self->area();
}
}

{
package Circle;
use parent -norequire, 'Shapes';
use Scalar::Util qw/looks_like_number/;
use Math::Trig;

sub new {
my $class = shift;
my $self = $class->SUPER::new(name => 'Circle', @_);
die 'Missing radius' unless defined($self->{radius});
die 'Invalid radius (not a number)'
unless looks_like_number($self->{radius});
$self
}
sub area {
my $self = shift;
pi * ($self->{radius} ** 2)
}
sub circumference {
my $self = shift;
2 * pi * $self->{radius};
}
sub print {
my $self = shift;
$self->SUPER::print;
printf "Circumference: \t%.2f\n", $self->circumference;
}

}

{
package Rectangle;
use parent -norequire, 'Shapes';
use Scalar::Util qw/looks_like_number/;

sub new {
my $class = shift;
my $self = $class->SUPER::new(name => 'Rectangle', @_);
do {
die "Missing $_" unless defined($self->{$_});
die "Invalid $_" unless looks_like_number($self->{$_});
} for qw/length breadth/;
$self;
}
sub area {
my $self = shift;
$self->{length} * $self->{breadth}
}
sub print {
my $self = shift;
$self->SUPER::print();
do {
printf ucfirst($_).": \t%.2f\n", $self->{$_}
} for qw/length breadth/;
}
}

package main;

my @shapes = ( Circle->new( radius => 4.2 ),
Rectangle->new(length => 2.7, breadth => 3.1),
Rectangle->new(length => 6.2, breadth => 2.6),
Circle->new( radius => 17.3) );
$_->print for @shapes;

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();
}

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();
}
}

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.

perl

package Person;

use Moose;
use MooseX::Storage;
with Storage('format' => 'JSON', 'io' => 'File');

has 'name' => (is => 'rw', isa => 'Str');
has 'age' => (is => 'rw', isa => 'Int');

1;

Person->new( name => 'David B.', age => 28)->store('person.json');

my $p = Person->load('person.json');

{
package Serializable;
use Role::Basic;
use Storable qw'store_fd retrieve_fd';
use Scalar::Util 'blessed';
use IO::Handle;
use Carp;

sub save {
my $self = shift;
my $fd = shift or croak 'Needs target file handle';
$DB::single = (1);
store_fd($self, $fd);
}

sub restore {
my $class = shift;
my $fd = shift or croak 'Needs source file handle';
my $self = retrieve_fd( $fd );
bless $self, $class
}

}
{
package Person;
use Role::Basic 'with';
use Scalar::Util 'looks_like_number';
use Carp;

with 'Serializable';

sub new {
my $class = shift;
croak 'Invalid parameters' if (@_ % 2);
%parameters = @_;

do {
croak "Missing $_" unless defined $parameters{$_}
} for qw/name age/;
croak 'Invalid age' unless looks_like_number($parameters{age});
bless \%parameters, $class
}
sub name {
$self{name}
}
sub age {
$self{age}
}
}

use IO::Handle;
my $p1 = Person->new(age => 42, name => 'Milly Fogg');
open my $fh, '+>', 'person.store';
$p1->save( $fh );
seek $fh, 0, SEEK_SET;
my $p2 = Person->restore( $fh );

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;
}

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.

perl

# requires libwww-perl
use LWP::Simple;

if (grep /perl/, get('http://langref.org/')) {
print 'perl appears on langref.org';
} else {
print 'perl does not appear on langref.org';
}

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);

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.

perl

#SendSimpleEmail.pl
#
# Uses NET::SMTP to send an email to a specific email address
#Modification History
# 2009-MAR-17: GGARIEPY: [creation] (note: geoff.gariepy@gmail.com)

use strict;
use Net::SMTP; # See http://search.cpan.org/~gbarr/libnet-1.22/Net/SMTP.pm

my $smtpserver = 'some.smtp.server.fqdn.com'; # FQDN of SMTP server
my $fromaddress = 'somebody.surname@someemail.com';# Authorized user of SMTP server
my $subject = 'Greetings from langref.org'; # Subject of the message
my $recipient = 'geoff.gariepy@gmail.com'; # Recipient address
my @now;

# Prompt user for the message body to send
print "Enter the body of the message to send, then press Enter >";
my $message = <STDIN>; # String containing the body of the email

# Prompt user to see if execution should continue
print "Open connection to SMTP server [$smtpserver] to send your message? y/N [N] >";
my $yesorno = <STDIN>;
unless ($yesorno =~ /y/i ) {
print "Aborting send of message\n";
exit;
}

my $smtp = Net::SMTP->new($smtpserver, Debug => 1);# Connect to the SMTP server, and
# output diagnostics to STDOUT (DEBUG mode)

# Check to make sure connection was established; die if not.
if (!ref($smtp)) {
die("SENDMAIL: Couldn't establish session with $smtpserver! Message not sent!\n");
}

# Start the communication with the SMTP server by telling it we want
# to mail something.
$smtp->mail($fromaddress);

# Perl's NET::SMTP interface specifies the recipient(s) of the message by
# calls to the recipient method.
# Note that the method should be called once for each separate recipient
# (set up a loop to do this.)
# We're only going to do it once, however, since we only have one recipient.
$smtp->recipient($recipient);

# Figure out current date/time for the message date stamp
# Date stamp format is DD Monthname YY HH:MM:SS TIMEZONE
my @monthnames = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
@now = gmtime(time);
for (0..$#now) {
# Make single-digit date/time elements two digits
if (length($now[$_]) lt 2) {$now[$_] = '0'.$now[$_];} # (i.e. prefix with '0')
}

# Slice off just the time and date elements we need from the output of gmtime()
my($YY, $MON, $DD, $HH, $MM, $SS) = @now[5,4,3,2,1,0];
$YY += 1900; # gmtime() epoch starts at 1900

my $monthname = $monthnames[$MON]; # Get the name of the month

# Finally build the silly date stamp!
my $datestring = "Date: $DD $monthname $YY $HH:$MM:$SS GMT";

# Tell the SMTP server we're about to send a block of message data
$smtp->data();
$smtp->datasend("$datestring"); # Give it the message date stamp
$smtp->datasend("From: $fromaddress\n"); # Send from address
$smtp->datasend("To: $recipient\n"); # Build the *display* list of 'to:' addresses
$smtp->datasend("Subject: $subject\n\n"); # Send subject delimited by two CRLFs
$smtp->datasend($message); # Send the message body
$smtp->dataend(); # Actually sends the message!!
$smtp->quit(); # Close the link to the SMTP server

__END__

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

perl

#! /usr/bin/perl
# -*- Mode: CPerl -*-

use strict;
use XML::Simple;
use Data::Dumper;

# 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

my $xml =
" <shopping>\n"
." <item name=\"bread\" quantity=\"3\" price=\"2.50\"/>\n"
." <item name=\"milk\" quantity=\"2\" price=\"3.50\"/>\n"
." </shopping>\n";

my $xs = XML::Simple->new();
my $ref = $xs->XMLin($xml);
my $stuff = ${$ref}{item};

my $q;
my $p;
my $t;
my $z;

foreach my $item ( sort keys %{$stuff}){
$q = ${$stuff}{$item}{quantity};
$p = ${$stuff}{$item}{price};
$z = $q*$p;
printf "%5.5s %2d @\$%5.2f = \$%5.2f\n",$item,$q,$p,$z;
$t += $z;
}
printf "Total \$%5.2f\n",$t;

#eos

use strict;
use XML::Twig;

use Data::Dumper;

my $xml = <<ENDXML;
<shopping>
<item name="bread" quantity="3" price="2.50"/>
<item name="milk" quantity="2" price="3.50"/>
</shopping>
ENDXML

my $xt = XML::Twig->parse( $xml );

my $price;
foreach my $item ($xt->root->children('item')) {
$price += ($item->{att}{price} * $item->{att}{quantity})
}

printf "Total Cost: %.2f\n", $price

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;

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);

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>

perl

#! /usr/bin/perl
# -*- Mode: CPerl -*-

use strict;
use XML::Simple;
use Data::Dumper;

# 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>
#

my $line;
my $item;
my $q;
my $p;
my $z;

my $xs = XML::Simple->new();
my %d = ();
while($line=<DATA>){
chomp $line;
($item,$q,$p) = split ",",$line;
$d{shopping}{item}{$item}{quantity} = $q;
$d{shopping}{item}{$item}{price} = $p;
}

$xml = $xs->XMLout(\%d, KeepRoot => 1);
print $xml,"\n";

__DATA__
bread,3,2.50
milk,2,3.50

use strict;
use XML::Writer;
use Text::CSV;

my $csv = <<ENDOFCSV;
bread,3,2.50
milk,2,3.50
ENDOFCSV

open my $fh, '<', \$csv or die "Can't open string, $!\n";
my $csv = Text::CSV->new;
my $writer = XML::Writer->new(DATA_MODE => 1, DATA_INDENT => 2);

$writer->startTag('shopping');

while (my $arr_ref = $csv->getline($fh)) {
my %attributes;
@attributes{qw/name quantity price/} =
@{$arr_ref}[0..2];
$writer->emptyTag('item' => %attributes)
}
$writer->endTag('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;

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>");

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]

perl

#!/usr/bin/perl
my @results;
for my $x (1..20) {
for my $y ($x..20) {
my $z = sqrt($x**2+$y**2);
push @results, [$x,$y,$z] if $z == int($z);
}
}
for my $triangle ( sort { $a->[2] <=> $b->[2] } @results) {
print "[".join(',',@$triangle)."]\n";
}

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;

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.

perl

sub gcd {
my ($a, $b) = @_;
($a,$b) = ($b,$a) if $a > $b;

while ($a) { ($a, $b) = ($b % $a, $a) }

return $b;
}

print gcd( 8, 12 );

my $g = gcd (8, 12);
print $g;

sub gcd {
# Euclid's Algorithm - recursive
my ($c, $d) = @_;
return $c unless $d;
return gcd ($d, $c % $d);
}

my $g = gcd2 (8, 12);
print $g;

sub gcd2 {
# Dijkstra's Algorithm - recursive
my ($c, $d) = @_;
return $c if $c == $d;
return $c > $d? gcd2 ($c - $d, $d) : gcd2 ($c, $d - $c);
}

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;
}

csharp

public static int gcd(int a, int b)
{
if (b == 0)
return a;
else
return gcd(b, a % 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.

perl

seek DATA,0,0;
print <DATA>;
__DATA__
Cheating quine.

$_=q(print qq(\$_=q($_);eval\n));eval

$x=q($x=q(%s);printf($x,$x););printf($x,$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")) }

Parallel

Pool of Workers

Subdivide A Problem To A Pool Of Workers (No Shared Data)

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;

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.

perl

use threads;

foreach my $tid ("one","two","three","four") {
threads->create(
sub { print("Thread $tid says Hello World!\n"); }
)->join();
}

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;
}
}

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();
}

i18n

i18n-helloworld

Put a internationalizate of HelloWorld program

Set locale to "es" (spanish) and provide a program that changes outputs ("Helloworld") depending of locale.

In pseudocode:

Void main ()

{



Locale.set("es")



print.translate("Helloworld, Locale.get)



}

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href="http://fr.weddingdressescompany.com/robes-de-mariée-c-1.html ">Robes de Mariée</a> :: <br/> <a href="http://fr.weddingdressescompany.com/robes-de-mariée-robe-de-mariée-sexy-c-1_30.html ">Robe de mariée sexy</a> :: <br/>Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes<br/></div> <br/><br/> <br/> <br/> <br/><br/> <br/><br/> <br/> <br/><div class="centerColumn" id="productGeneral "> <br/> <br/> <br/><h1 id="productName" class="productGeneral ">Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes</h1> <br/> <br/><form name="cart_quantity" action="http://fr.weddingdressescompany.com/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html?action=add_product&number_of_uploads=0" method="post" enctype="multipart/form-data "><br/> <br/><div style="float:left; "> <br/> <br/> <br/> <br/><div id="productMainImage" class="centeredContent back "> <br/> <br/><noscript> <br/><a href="http://fr.weddingdressescompany.com/index.php?main_page=popup_image&pID=456" target="_blank "> <a href="http://fr.weddingdressescompany.com/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html" ><img src="http://fr.weddingdressescompany.com/images/weddingdress/sxw0018.jpg" alt="Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes" title=" Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes " width="240" height="329" /></a><br /><span class="imgLink ">Agrandir l'</code>image<<code>/span></</code>a><<code>/noscript> <br/></</code>div> <br/> <br/> <div id=<code>"productAdditionalImages "</code>> <br/> <div id=<code>"dfse "</code>><<code>/div> <br/> <div class="centerBoxContent "> <br/> <br/> <br/> <div class="additionalImages centeredContent back" style="width:100%; "><br/> <br/> <noscript><a href="http:/fr.weddingdressescompany.com/</code>low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html<code>" target="</code>_blank <code>"> <a href="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html" ><img src="http:/fr.weddingdressescompany.com/</code>images<code>/weddingdress/</code>sxw0018_01.jpg<code>" alt="</code>Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes<code>" title="</code> Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes <code>" width="</code>130<code>" height="</code>174<code>" style="</code>position:relative<code>" onmouseover="</code>showtrail(<code>'images/weddingdress//sxw0018_01.jpg'</code>,<code>'Low Cost Custom-Made bretelles sexy mariage mariée robe de mariée Robes'</code>,130,173,243,325,this,0,0,130,173);<code>" onmouseout="</code>hidetrail();<code>" /></a><br /><span class="</code>imgLinkAdditional <code>">Agrandir l'image</span></a></noscript></div><br/><br class="</code>clearBoth<code>" /> <br/> <br/></div></div> <br/> <br/></div> <br/> <br/><div style="</code>width:348px;float:right;<code>" id='pb-left-column'> <br/> <br/><span id="</code>productPrices<code>" class="</code>productGeneral <code>"> <br/>Price: <br/><span class="</code>normalprice <code>">$218.77 </span> <span class="</code>productSpecialPrice <code>">$175.01</span><span class="</code>productPriceDiscount <code>"><br />Economie : 20%</span></span> <br/><div class="</code>model_number<code>" style="</code>height:14px;padding-top:7px <code>"><h4 style="</code>float: left;color:black; <code>"><label class="</code>class <code>">Modèle : </label></h4><div style="</code>float: left;margin-top:5px;margin-left:6px; <code>"><span style="</code>font-size:12px;height:20px;color:black; <code>">Mall3411</span></div><br/></div> <br/> <br/> <br/> <br/> <br/> <br/><div id="</code>productAttributes <code>"> <br/><h1 style='margin-bottom: 10px;'>Step 1 - Choose Options:</h1> <br/> <br/> <br/><div class="</code>wrapperAttribsOptions <code>"> <br/><h4 class="</code>optionName back <code>"><label>Colors</label></h4> <br/><div class="</code>back <code>"><br/><select name="</code>id<code>[8]</code><code>" id="</code>attrib-8 <code>"><br/> <option value="</code>46 <code>">1</option><br/> <option value="</code>52 <code>">10</option><br/> <option value="</code>53 <code>">12</option><br/> <option value="</code>54 <code>">16</option><br/> <option value="</code>55 <code>">17</option><br/> <option value="</code>56 <code>">18</option><br/> <option value="</code>47 <code>">2</option><br/> <option value="</code>57 <code>">20</option><br/> <option value="</code>58 <code>">21</option><br/> <option value="</code>59 <code>">23</option><br/> <option value="</code>60 <code>">26</option><br/> <option value="</code>61 <code>">27</option><br/> <option value="</code>62 <code>">28</option><br/> <option value="</code>63 <code>">29</option><br/> <option value="</code>64 <code>">30</option><br/> <option value="</code>65 <code>">31</option><br/> <option value="</code>66 <code>">33</option><br/> <option value="</code>67 <code>">35</option><br/> <option value="</code>68 <code>">36</option><br/> <option value="</code>69 <code>">37</option><br/> <option value="</code>48 <code>">4</option><br/> <option value="</code>70 <code>">41</option><br/> <option value="</code>71 <code>">43</option><br/> <option value="</code>72 <code>">44</option><br/> <option value="</code>73 <code>">47</option><br/> <option value="</code>74 <code>">48</option><br/> <option value="</code>75 <code>">49</option><br/> <option value="</code>49 <code>">5</option><br/> <option value="</code>76 <code>">51</option><br/> <option value="</code>77 <code>">54</option><br/> <option value="</code>78 <code>">56</option><br/> <option value="</code>79 <code>">60</option><br/> <option value="</code>80 <code>">61</option><br/> <option value="</code>81 <code>">66</option><br/> <option value="</code>82 <code>">67</option><br/> <option value="</code>83 <code>">69</option><br/> <option value="</code>84 <code>">73</option><br/> <option value="</code>85 <code>">77</option><br/> <option value="</code>86 <code>">78</option><br/> <option value="</code>87 <code>">79</option><br/> <option value="</code>50 <code>">8</option><br/> <option value="</code>51 <code>">9</option><br/> <option value="</code>27 <code>">Ivory</option><br/> <option value="</code>26 <code>">Same As Picture</option><br/> <option value="</code>28 <code>">White</option><br/></select><br/><br/></div> <br/><br class="</code>clearBoth<code>" /> <br/></div> <br/> <br/> <br/> <br/> <br/><br/><br class="</code>clearBoth<code>" /> <br/> <br/><div class="</code>wrapperAttribsOptions <code>"> <br/><h4 class="</code>optionName back <code>"><label>Sizes</label></h4> <br/><div class="</code>back <code>"><br/><select name="</code>id<code>[9]</code><code>" id="</code>attrib-9 <code>"><br/> <option value="</code>29 <code>">US 10 / UK 12 / EUR 40</option><br/> <option value="</code>30 <code>">US 12 / UK 14 /EUR 42</option><br/> <option value="</code>31 <code>">US 14 / UK 16 /EUR 44</option><br/> <option value="</code>32 <code>">US 16 / UK 18 /EUR 46</option><br/> <option value="</code>33 <code>">US 18 / UK 20 /EUR 48</option><br/> <option value="</code>34 <code>">US 2 / UK 4 /EUR 32</option><br/> <option value="</code>35 <code>">US 20 / UK 22 /EUR 50</option><br/> <option value="</code>36 <code>">US 22 / UK 24 /EUR 52</option><br/> <option value="</code>37 <code>">US 24 / UK 26 /EUR 54</option><br/> <option value="</code>38 <code>">US 26 / UK 28 /EUR 56</option><br/> <option value="</code>39 <code>">US 28 / UK 30 /EUR 58</option><br/> <option value="</code>40 <code>">US 4 / UK 6 /EUR 34</option><br/> <option value="</code>41 <code>">US 6 / UK 8 /EUR 36</option><br/> <option value="</code>42 <code>">US 8 / UK 10 /EUR 38</option><br/></select><br/><br/></div> <br/><br class="</code>clearBoth<code>" /> <br/></div> <br/> <br/> <br/> <br/> <br/><br/><br class="</code>clearBoth<code>" /> <br/> <br/><div class="</code>wrapperAttribsOptions <code>"> <br/><h4 class="</code>optionName back <code>"><label>Back style</label></h4> <br/><div class="</code>back <code>"><br/><select name="</code>id<code>[10]</code><code>" id="</code>attrib-10 <code>"><br/> <option value="</code>44 <code>">Lace Up</option><br/> <option value="</code>43 <code>">Same As Picture</option><br/> <option value="</code>45 <code>">Zip Up</option><br/></select><br/><br/></div> <br/><br class="</code>clearBoth<code>" /> <br/></div> <br/> <br/> <br/> <br/> <br/><br/><br class="</code>clearBoth<code>" /> <br/> <br/><div style="</code>padding-bottom:5px; <code>"><a href="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/size.html" style="color:black;font-weight:bold;text-decoration:underline; color:#FF0000;" target="_blank ">Size Chart</</code>a> | <a href=<code>"http://fr.weddingdressescompany.com/color.html"</code> style=<code>"color:black;font-weight:bold;text-decoration:underline;color:#FF0000;"</code> target=<code>"_blank "</code>>Color Chart<<code>/a></</code>div> <br/> <br/> <br/><<code>/div> <br/><div id='quantity_cart'> <br/><h1>Step 2 - Choose Quantity:</</code>h1> <br/> <br/> <br/> <div class=<code>"wrapperAttribsOptions"</code> style=<code>"height:14px;padding-top:7px "</code>><h4 style=<code>"float:left; "</code>><label class=<code>"attribsInput "</code>>Quantity :<<code>/label></</code>h4><div style=<code>"float:left; "</code>><input type=<code>"text"</code> class=<code>"text"</code> id=<code>"quantity_wanted"</code> name=<code>"cart_quantity"</code> value=<code>"1"</code> maxlength=<code>"6"</code> size=<code>"4"</code> <code>/></</code>div><<code>/div> <br/> <br class="clearBoth "> <br/> <h1 style='margin-bottom: 10px;'>Step 3 - Add to cart:</</code>h1> <br/> <p id=<code>'add_to_cart'</code> class=<code>'buttons_bottom_block'</code>> <br/> <input type=<code>"hidden"</code> name=<code>"products_id"</code> value=<code>"456"</code> <code>/><input type="image" src="http:/fr.weddingdressescompany.com/</code>includes<code>/templates/</code>weddingdress-7<code>/buttons/</code>french<code>/button_in_cart.gif" alt="ajouter au panier" title=" ajouter au panier " /</code>> <<code>/p> <br/> <br/></</code>div> <br/><div> <br/> <div class=<code>'safe_onlinechat'</code>> <br/> <div class=<code>'safe_ssl'</code>> <br/> <a target=<code>'_blank'</code> href=<code>'msnim:chat?contact=myonlineservice@msn.com'</code> style=<code>"float:left; "</code>><img src=<code>'http://fr.weddingdressescompany.com/banner/msn.jpg'</code>><<code>/a> <br/> <a target='_blank' href='callto:/meganfox59'><img border=0 align='absmiddle' src='http:/fr.weddingdressescompany.com/</code>banner<code>/skype.jpg' style="float:left; "></</code>a> <br/> <<code>/div> <br/> </</code>div> <br/> <br/><<code>/div> <br/> <br/></</code>div> <br/> <br/> <br/><br class=<code>"clearBoth"</code> <code>/> <br/><div id='descript_menu'> <br/><ul id='more_info_tabs' class='idTabs idTabsShort'> <br/> <li><a onclick='dissplay_descript(this);' style='cursor:pointer;'>Details</</code>span><<code>/a></</code>li> <br/> <li><a onclick=<code>'displaysize(this);'</code>style=<code>'cursor:pointer;'</code>>SIZE & COLOR CHART<<code>/a></</code>li> <br/> <li><a onclick=<code>'dissplay_return(this);'</code>style=<code>'cursor:pointer;'</code>>Shipping<<code>/a></</code>li> <br/> <li><a onclick=<code>'measure(this);'</code>style=<code>'cursor:pointer;'</code>>How to Measure<<code>/a></</code>li> <br/><<code>/ul> <br/><script> <br/> function displaysize(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> var descript = document.getElementById('productDescription'); <br/> <br/> idTabtwo.setAttribute('class','block_hidden_only_for_screen'); <br/> descript.setAttribute('class','display'); <br/> shipping_return.setAttribute('class','display'); <br/> measure.setAttribute('class','display'); <br/> } <br/> function dissplay_descript(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var descript = document.getElementById('productDescription'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> descript.setAttribute('class','block_hidden_only_for_screen'); <br/> idTabtwo.setAttribute('class','display'); <br/> shipping_return.setAttribute('class','display'); <br/> measure.setAttribute('class','display'); <br/> <br/> } <br/> function dissplay_return(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> var descript = document.getElementById('productDescription'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> shipping_return.setAttribute('class','block_hidden_only_for_screen'); <br/> idTabtwo.setAttribute('class','display'); <br/> descript.setAttribute('class','display'); <br/> measure.setAttribute('class','display'); <br/> <br/> } <br/> function measure(obj){ <br/> var measure = document.getElementById('idTabMeasure'); <br/> var shipping_return = document.getElementById('tab_3'); <br/> var descript = document.getElementById('productDescription'); <br/> var idTabtwo = document.getElementById('idTabtwo'); <br/> measure.setAttribute('class','block_hidden_only_for_screen'); <br/> idTabtwo.setAttribute('class','display'); <br/> descript.setAttribute('class','display'); <br/> shipping_return.setAttribute('class','display'); <br/> <br/> <br/> <br/> } <br/></</code>script> <br/><div id=<code>'more_info_sheets'</code> class=<code>'sheets align_justify'</code>> <br/> <br/><div id=<code>"productDescription"</code> class=<code>'displayblock'</code>>Nom de l<code>'article:</div> <br/> <br/><div id='</code>idTabtwo<code>' class='</code>display<code>'> <br/> <div class='</code>SizeKind<code>'> <br/> <div style='</code>background-attachment: scroll; background-image: none; background-position: 0pt 0pt; background-repeat: repeat; border-bottom: 1px solid rgb(238, 238, 238); margin-bottom: 10px; padding-bottom: 10px; padding-top: 10px; text-align: center;<code>'> <br/> <p style='</code>font-weight: bold; color: rgb(178, 30, 54); font-size: 14px;<code>'>Please choose your favorite color from the palette</p> <br/> <a id='</code>single_3<code>' href='</code>http:<code>//</code>fr.weddingdressescompany.com<code>/image/</code>img_ColorCard.jpg<code>'><img src='</code>http:<code>//</code>fr.weddingdressescompany.com<code>/image/</code>img_ColorCard.jpg<code>' alt='</code>wedding dress card palette<code>' width='</code>720<code>'></a> <br/> <p style='</code>text-align: left;<code>'><span style='</code>color: rgb(255, 0, 0);<code>'>Notice:</span>Since computer screens have chromatic aberration, especially between CRT screen and LCD screen, we can not guarantee the color of the dress you get will be 100% similar as the color chart. And also different fabrics will show different color degree on the same color. So we can not accept any returned dress for sake of color. Please kindly understand us.</p> <br/> </div> <br/> <div style='</code>background-attachment: scroll; background-image: none; background-position: 0pt 0pt; background-repeat: repeat; border-bottom: 1px solid rgb(238, 238, 238); margin-bottom: 20px; padding-bottom: 20px; padding-top: 10px; text-align: center;<code>'> <br/> <p style='</code>font-weight: bold; color: rgb(178, 30, 54); font-size: 14px;<code>'> Please choose your size</p> <br/> <table cellspacing="0" cellpadding="0 "> <br/> <tbody> <br/> <tr> <br/> <th colspan="15 ">Standard size (in centimeter)</th> <br/> </tr> <br/> <tr> <br/> <br/> <th>US size no</th> <br/> <td>2</td> <br/> <td>4</td> <br/> <td>6</td> <br/> <td>8</td> <br/> <td>10</td> <br/> <br/> <td>12</td> <br/> <td>14</td> <br/> <td>16</td> <br/> <td>18</td> <br/> <td>20</td> <br/> <td>22</td> <br/> <br/> <td>24</td> <br/> <td>26</td> <br/> <td>28</td> <br/> </tr> <br/> <tr> <br/> <th>EUR size no</th> <br/> <td>32</td> <br/> <br/> <td>34</td> <br/> <td>36</td> <br/> <td>38</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <td>44</td> <br/> <br/> <td>46</td> <br/> <td>48</td> <br/> <td>50</td> <br/> <td>52</td> <br/> <td>54</td> <br/> <td>56</td> <br/> <br/> <td>58</td> <br/> </tr> <br/> <tr> <br/> <th>Bust</th> <br/> <td>84</td> <br/> <td>86</td> <br/> <td>89</td> <br/> <br/> <td>91</td> <br/> <td>94</td> <br/> <td>98</td> <br/> <td>102</td> <br/> <td>105</td> <br/> <td>109</td> <br/> <br/> <td>114</td> <br/> <td>119</td> <br/> <td>124</td> <br/> <td>132</td> <br/> <td>142</td> <br/> </tr> <br/> <br/> <tr> <br/> <th>Waist</th> <br/> <td>66</td> <br/> <td>69</td> <br/> <td>71</td> <br/> <td>74</td> <br/> <br/> <td>76</td> <br/> <td>80</td> <br/> <td>84</td> <br/> <td>88</td> <br/> <td>91</td> <br/> <td>96</td> <br/> <br/> <td>102</td> <br/> <td>107</td> <br/> <td>114</td> <br/> <td>124</td> <br/> </tr> <br/> <tr> <br/> <th>Hip</th> <br/> <br/> <td>91</td> <br/> <td>94</td> <br/> <td>97</td> <br/> <td>99</td> <br/> <td>102</td> <br/> <td>105</td> <br/> <br/> <td>109</td> <br/> <td>113</td> <br/> <td>117</td> <br/> <td>122</td> <br/> <td>127</td> <br/> <td>132</td> <br/> <br/> <td>140</td> <br/> <td>150</td> <br/> </tr> <br/> <tr> <br/> <th>Shoulder to floor</th> <br/> <td>150</td> <br/> <td>150</td> <br/> <br/> <td>151</td> <br/> <td>152</td> <br/> <td>152</td> <br/> <td>153</td> <br/> <td>154</td> <br/> <td>154</td> <br/> <br/> <td>155</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <td>156</td> <br/> <br/> </tr> <br/> </tbody> <br/></table> <br/><p> </p> <br/><table cellspacing="0" cellpadding="0 "> <br/> <tbody> <br/> <tr> <br/> <th colspan="15 ">Standard size (in inches)</th> <br/> </tr> <br/> <br/> <tr> <br/> <th>US size no</th> <br/> <td>2</td> <br/> <td>4</td> <br/> <td>6</td> <br/> <td>8</td> <br/> <br/> <td>10</td> <br/> <td>12</td> <br/> <td>14</td> <br/> <td>16</td> <br/> <td>18</td> <br/> <td>20</td> <br/> <br/> <td>22</td> <br/> <td>24</td> <br/> <td>26</td> <br/> <td>28</td> <br/> </tr> <br/> <tr> <br/> <th>EUR size no</th> <br/> <br/> <td>32</td> <br/> <td>34</td> <br/> <td>36</td> <br/> <td>38</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <br/> <td>44</td> <br/> <td>46</td> <br/> <td>48</td> <br/> <td>50</td> <br/> <td>52</td> <br/> <td>54</td> <br/> <br/> <td>56</td> <br/> <td>58</td> <br/> </tr> <br/> <tr> <br/> <th>Bust</th> <br/> <td>33</td> <br/> <td>34</td> <br/> <br/> <td>35</td> <br/> <td>36</td> <br/> <td>37</td> <br/> <td>39</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <br/> <td>43</td> <br/> <td>45</td> <br/> <td>47</td> <br/> <td>49</td> <br/> <td>52</td> <br/> <td>56</td> <br/> <br/> </tr> <br/> <tr> <br/> <th>Waist</th> <br/> <td>26</td> <br/> <td>27</td> <br/> <td>28</td> <br/> <td>29</td> <br/> <br/> <td>30</td> <br/> <td>32</td> <br/> <td>33</td> <br/> <td>35</td> <br/> <td>36</td> <br/> <td>38</td> <br/> <br/> <td>40</td> <br/> <td>42</td> <br/> <td>45</td> <br/> <td>49</td> <br/> </tr> <br/> <tr> <br/> <th>Hip</th> <br/> <br/> <td>36</td> <br/> <td>37</td> <br/> <td>38</td> <br/> <td>39</td> <br/> <td>40</td> <br/> <td>42</td> <br/> <br/> <td>43</td> <br/> <td>45</td> <br/> <td>46</td> <br/> <td>48</td> <br/> <td>50</td> <br/> <td>52</td> <br/> <br/> <td>55</td> <br/> <td>59</td> <br/> </tr> <br/> <tr> <br/> <th>Shoulder to floor</th> <br/> <td>59</td> <br/> <td>59</td> <br/> <br/> <td>60</td> <br/> <td>60</td> <br/> <td>60</td> <br/> <td>60</td> <br/> <td>61</td> <br/> <td>61</td> <br/> <br/> <td>61</td> <br/> <td>61</td> <br/> <td>62</td> <br/> <td>62</td> <br/> <td>62</td> <br/> <td>62</td> <br/> <br/> </tr> <br/> </tbody> <br/></table> <br/> <br/> </div> <br/> <br class='</code>clear<code>'> <br/> </div> <br/></div> <br/> <br/> <br/> <div id="tab_3" class='</code>display<code>'> <br/> <br/> <h3>Shipping Time</h3> <br/><p>Total Time=Operation Time + Shipping Time</p> <br/><p>Default operation time is 30 business days from the day you place an order. <br/>We will rush your order within 20 business days and 15 business days if you <br/>choose rush service from the operation time option,and you will pay extra <br/>cost for it.Shipping time varies as: UPS , TNT 2-4 business days, Air Mail(Express) 10 <br/>business days, Air Mail(Normal) 20 business days. Please calculate the total <br/>time carefully before you place the order.</p> <br/><p><i>Note: You can also choose Air Mail(Normal) if package weight is under 2kg.</i></p> <br/> <br/><h3>Return Tips</h3> <br/><p>If any returns, please contact our customer support within 24 hours from the time you receive your gown and fill in the Application for Refund in email. Only products in their original condition will be accepted. We do not accept returns on any custom made order. ALL SALES ARE FINAL for custom made dresses. For mis-shipped items, once confirmation got with us, we will be responsible for item exchange and have full refund returned including shipping fee and handling fee. In principle, any emergency order isnot subject to this return policy and will be denied. Also other merchandise, such as veil ect.</p></div> <br/> <br/><div id="idTabMeasure" style="height:510px;" class='</code>display<code>'> <br/> <div class="tempnr_box "> <br/> <br/> <div class="images_zuo "> <a href="http://fr.weddingdressescompany.com/low-cost-custommade-bretelles-sexy-mariage-mariée-robe-de-mariée-robes-p-456.html" ><img width="163" height="479" src="http://fr.weddingdressescompany.com/image/wedding_size.jpg"/></a></div> <br/> <br/> <div class="nr_right "> <br/> <p style="color:#b21e36;font-size:14px;font-style:italic;font-weight:bold; padding-left:0; ">How to Measure</p> <br/> <ul><li><span class="wzys ">A.Bust:</span>Measure Around The Fullest Part Of Your Bust.</li> <br/> <br/> <li><span class="wzys ">B.Waist:</span>Measure Around The Smallest Part Of Your Waistline.</li> <br/> <li><span class="wzys ">C.Hips:</span>Measure Around The Widest Part Of Your Hips.</li> <br/> <li><span class="wzys ">D.Length:</span> Measure From Top Of The Shoulder Through The Nipple To Floor,Including The Height Of <b>Wedding Shoes</b>.</li> <br/> <li><span class="wzys ">E.Under Bust:</span>Measure Around Under Your Bust.</li> <br/> <br/> <li><span class="wzys ">F.Nipple To Nipple:</span> The Measurement Between Your Two Nipples.</li> <br/> <li><span class="wzys ">G.Shoulder To NiPPLE:</span>Measure From Top Of The Shoulder To Nipple.</li> <br/> <li><span class="wzys ">H.Shoulder TO Waist:</span>Measure From Top Of The Shoulder Through The Nipple TO Waist.</li> <br/> <li><span class="wzys ">I.Shoulder To Hips:</span>Measure From Top Of The Shoulder Through The Nipple TO Hips.</li> <br/> <br/> <li><span class="wzys ">J.Shoulder To Shoulder:</span>Measure Your Shoulder Width From The Back.</li> <br/> <li><span class="wzys ">k.Neck:</span>Measure Around The Fullest Part Of Your Neck.</li> <br/> <li><span class="wzys ">L.Biceps:</span>Measure Around The Widest Part Of Your Arm.</li> <br/> <li class="wzys" style="color:#DD0000;font-size:14px;font-weight:bold;padding:5px;text-align:right;border:1px solid #eee; ">Please Measure With Bra and Underwear On.</li> <br/> <li class="wzys" style="font-size:11px;font-weight:bold;text-align:right; ">Remember To Keep The Measuring Tape Comfortably Loose.</li></ul> <br/> <br/> <br class="clear" /> <br/> <div><span style="color:#DD0000; margin-top:10px; ">Notice:</span>1. Please also tell us your "Height with Shoes" on (measured from top head to your wedding shoes'</code> heel).<br> <br/>2. Please remember that wear your Wedding Underwear and your Wedding Shoes.<br> <br/>3.Inches and Centimetersare both available for size, and please tell us if you use inches or centimeters.<br> <br/>4. We suggest you measure yourself by a Professional Tailor. <br> <br/>5. It is very normal to have 3CM measurement error between the sizes you give and the sizes you will receive on your dress. This kind of error can not be accepted for any returns and exchanges. <<code>/div> <br/> <br/> </</code>div> <br/> <br/> <span class=<code>"clear "</code>><<code>/span> <br/> </</code>div> <br/> <<code>/div> <br/> <br/></</code>div> <br/><<code>/div> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br class="clear" /</code>> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/><<code>/form> <br/> <br/></</code>div> <br/><<code>/td> <br/> <br/> <br/></</code>tr> <br/><<code>/table> <br/><br/> <br/> <br/><div id="navSuppWrapper "> <br/> <br/><div id="navSupp "> <br/><ul><li><a href="http:/fr.weddingdressescompany.com/</code>index.php <code>">Accueil</a></li> <br/><li><a href="</code>http:<code>//</code>fr.weddingdressescompany.com<code>/index.php?main_page=shippinginfo ">Frais de port</</code>a><<code>/li> <br/><li><a href="http:/fr.weddingdressescompany.com/</code>index.php?main_page=Wholesale <code>">Vente en 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