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Hello World Essay

882 words - 4 pages

"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 ...view middle of the document...

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.
[edit]History

This section may contain original research. Please improve it by verifying the claims made and adding references. Statements consisting only of original research may be removed. (September 2012)
While small test programs existed since the development of programmable computers, the tradition of using the phrase "Hello, world!" as a test message was influenced by an example program in the seminal book The C Programming Language. The example program from that book prints "hello, world" (without capital letters or exclamation mark), and was inherited from a 1974 Bell Laboratories internal memorandum by Brian Kernighan, Programming in C: A Tutorial, which contains the first known version:
main()
{
printf("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 Language B,[1] with the following code:
main( ) {
extrn a, b, c;
putchar(a); putchar(b); putchar(c); putchar('!*n');
}
a 'hell';
b 'o, w';
c 'orld';

For modern languages, the hello world program tends to subtly grow in sophistication. For example, the Go programming language introduced a multilingual hello world program,[2] Sun demonstrated a Java hello world...

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