#include <stdio.h>
int main ()
{
int x;
printf ("Hello World\n");
return (0);

for (x = 0; x < 5;  ++x)
printf ("%i\n",x);
 }

#include <stdio.h>
int main ()
{
int x;
printf ("Hello World\n");
return (0);

for (x = 0; x < 5;  ++x)
printf ("%i\n",x);
 }

#include <iostream>

class q
{
private:
    float x;
    float y;
    float z;
    float w;

public:
    q() : x(0.0f), y(0.0f), z(0.0f), w(0.0f) {}
    q(float x_, float y_, float z_, float w_) : x(x_), y(y_), z(z_), w(w_) {}

    q conj()
    {
        return q(-x, -y, -z, w);
    }

    q operator*(q& r)
    {
        return q(
            x * r.w + w * r.x - z * r.y + y * r.z,
            y * r.w + z * r.x + w * r.y - x * r.z,
            z * r.w - y * r.x + x * r.y + w * r.z,
            w * r.w - x * r.x - y * r.y - z * r.z
        );
    }
};

int main()
{
   std::printf("hello world");

    return 0;
}

#include <iostream>

class q
{
private:
    float x;
    float y;
    float z;
    float w;

public:
    q() : x(0.0f), y(0.0f), z(0.0f), w(0.0f) {}
    q(float x_, float y_, float z_, float w_) : x(x_), y(y_), z(z_), w(w_) {}

    q conj()
    {
        return q(-x, -y, -z, w);
    }
};

int main()
{
   std::printf("hello world");

    return 0;
}

{-# LANGUAGE RankNTypes #-}

dneg :: (forall r. (a -> r) -> r) -> a
dneg f = f id

main = putStrLn $ dneg (\f -> f "Hello World!")

module Main where

main :: IO ()
main = putStr "Hello world"

print("hello world")

print("Hello, world!")

print_endline "hello, world!"

<?php
echo "hello world"
?>

<?php
echo "Hello World!";
?>

#!/usr/bin/perl

print "Hello, World\n";

while(<DATA>){
  print $_;
}

__END__

print "Hello world"

print("hello world")

print("hello world")

puts "Hello world"

puts "Hello World!"

( display "hello world" )

(display "Hello, World!")