#include <stdio.h>

int main(void)
{
    printf("Hello, world!");
    return 0;
}

#include <iostream>

int main(void)
{
    std::cout << "Hello, world!";
    return 0;
}

class HelloWorld {
    static public void main( String args[] ) {
        System.out.println( "Hello, world!" );
    }
}

package main

import "fmt"

func main() {
    fmt.Println("Hello, world!")
}

echo 'Hello, world!';

print "Hello, world!";

'Hello, world!';

puts 'Hello, world!'