C

#include <stdio.h>
int main() {

   printf("Hello, John!");
   return 0;
}

C#

#include <iostream>

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

JAVA

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

JS

document.write('Hello, John!');

PHP

<?php
    echo 'Hello, John!';
?>

Python

print "Hello, John!"

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