/* A TUTORIAL INTRODUCTION TO THE LANGUAGE B
B. W. Kernighan Bell Laboratories, New Jersey,
January 1973 - first documented "hello, world!" */
main( ) {
 extrn a, b, c;
 putchar (a); putchar (b); putchar (c); putchar ('!*n');
}
a 'hell' ;
b 'o, w' ;
c 'orld' ;

/* C: "Hello, world!" */
#include <stdio.h>
#include <stdlib.h>
int main()
{
   printf("Hello world \n"); return 0;
}

// C#: "Hello, world!"
using System;
class HelloWorld {
 public static int Main(String[] args) {
 Console.WriteLine("Hello, world!");
 return 0;
 }
}

// C++: "Hello, world!"
#include <iostream>
int main() {
 std::cout << "Hello, world!" << std::endl;
}