Purpose
A "Hello World" program has become the traditional first program that many people learn. In general, it is simple enough so that people who have no experience with computer programming can easily understand it, especially with the guidance of a teacher or a written guide. Using this simple program as a basis, computer science principles or elements of a specific programming language can be explained to novice programmers. Experienced programmers learning new languages can also gain a lot of information about a given language's syntax and structure from a hello world program.
In addition, hello world can be a useful sanity test to make sure that a language's compiler, development environment, and run-time environment are correctly installed. Configuring a complete programming toolchain from scratch to the point where even trivial programs can be compiled and run can involve substantial amounts of work. For this reason, a simple program is used first when testing a new tool chain.
"Hello world" is also used by computer hackers as a proof of concept that arbitrary code can be executed through an exploit where the system designers did not intend code to be executed—for example, on Sony's PlayStation Portable. This is the first step in using homemade content ("home brew") on such a device.
Read more about this topic: Hello World Program
Famous quotes containing the word purpose:
“The purpose of punishment is to improve those who do the punishing—that is the final recourse of those who support punishment.”
—Friedrich Nietzsche (1844–1900)
“The purpose of playing, whose end, both at the first and now,
was and is, to hold as ‘twere the mirror up to nature: to show
virtue her feature, scorn her own image, and the very age and
body of the time his form and pressure.”
—William Shakespeare (1564–1616)
“In those days, when my hands were much employed, I read but little, but the least scraps of paper which lay on the ground, my holder, or tablecloth, afforded me as much entertainment, in fact answered the same purpose as the Iliad.”
—Henry David Thoreau (1817–1862)