int main()
{ 
    printf("hello world!\n");
    return 0;
}

#include <stdio.h>

int main()
{
    printf("Hello World");

    return 0;
}

#include <iostream>
using namespace std;

int main() 
{
    cout << "Hello, World!";
    return 0;
}

int main(){
cout<<"Hello World";
}

import std.stdio;

void main()
{
    writefln("Hello, World!");
}

main = putStrLn "Hello World"

main = putStrLn "Hello, world!"

print("Hello world!")

print("Hello, world!")

let main _ = 
    Printf.printf "Hello World"


let () =
    main ()

print_endline "Hello World!"

<?php
  echo "Hello world";
?>

<?php
echo "Hello World";

print "Hello, world!";

print STDOUT "Hello, world!";

print("hello world")

print("HELLO WORLD")

puts 'Hello world'

puts "Hello World"

(display "Hello World!\n")

(display "Hello, World!")