Hello World!

A "Hello world" program is a computer program that outputs "Hello World" (or some variant) on a display device. The first known version of this program comes from Brian Kernighan's paper A Tutorial Introduction to the Language B from 1972 (chapter 7).

In it's first form it was used to show how to use external variables in B but since then it has become pretty much the standard example to show the very basic syntax and most simple program in any given programming language.

int main() {
    printf("Hello World");
    return 0;

On this page1 you can find a bunch of source code examples in various programming languages.2

  1. This is a footnote with a link.
  2. This is another footnote.

Written by Peter Parker, a talented young freelance photographer and aspiring scientist imbued with superhuman abilities. Follow him on Twitter but don't stalk him.