Hello World

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"Hello World" redirects here. For the Iamus

(computer) composition, see Hello World!

(composition). For the 2009 compilation album by

Michael Jackson, see Hello World: The Motown Solo

Collection. For the song by Lady Antebellum, see

Hello World (song).

A GUI "Hello World" program, written in Perl

It is possible to execute unsigned code on Sony's

PlayStation Portable.

A light-programmable biofilm displaying the Hello

World message

CNC machining test in Perspex

A "Hello world" program is a computer program that

outputs "Hello, world" 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, or to verify that a language or system

is operating correctly.

In a device that does not display text, a simple

program to produce a signal, such as turning on an

LED, is often substitute