::"Hello, World!" program

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A "Hello World!" program, written in JavaScript and executed in Firefox 31

CNC machining test in Perspex

A "Hello World!" message being displayed through long-exposure light painting with a moving strip of LED lights

A "Hello, World!" program is a computer program that outputs "Hello, World!" (or some variant thereof) on a display device. Because it is typically one of the simplest programs possible in most programming languages, it is by tradition often used to illustrate to beginners the most basic syntax of a programming language. It is also used to verify that a language or system is operating correctly.

"Hello, World!" program sections
Intro  Purpose  History  Variations   See also   References   External links   

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