Hello world!

The first known instance of the usage of the words "hello" 
and "world" together in computer literature occurred earlier,
in Kernighan's 1972 Tutorial Introduction to the LanguageĀ B,
with the following code:

 main( ) {
   extrn a, b, c;
   putchar(a); putchar(b); putchar(c); putchar('!*n');
 }
 a 'hell';
 b 'o, w';
 c 'orld';