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Search Search Create account Log in Personal tools Create account Log in Pages for logged out editors learn more ContributionsTalk Contents move to sidebar hide (Top) 1History 2Variations 3Time to Hello World 4Wikipedia articles containing "Hello, World!" programs 5See also 6References 7External links Toggle the table of contents "Hello, World!" program 68 languages العربيةAsturianuAzərbaycancaবাংলাБеларускаяБългарскиBoarischBosanskiCatalàČeštinaDanskDeutschEestiΕλληνικάEspañolEsperantoEuskaraفارسیFrançaisGalego한국어Հայերենहिन्दीHrvatskiBahasa IndonesiaInterlinguaItalianoעבריתಕನ್ನಡქართულიLatviešuLëtzebuergeschMagyarМакедонскиമലയാളംმარგალურიBahasa MelayuMinangkabauNederlands日本語Norsk bokmålNorsk nynorskOʻzbekcha / ўзбекчаPolskiPortuguêsRomânăРусскийСаха тылаScotsShqipSimple EnglishSlovenčinaSlovenščinaکوردیСрпски / srpskiSrpskohrvatski / српскохрватскиSuomiSvenskaதமிழ்ไทยТоҷикӣTürkçeУкраїнськаاردوTiếng Việt吴语粵語中文 Edit links ArticleTalk English ReadView sourceView history Tools Tools move to sidebar hide Actions ReadView sourceView history General What links hereRelated changesUpload fileSpecial pagesPermanent linkPage informationCite this pageGet shortened URLDownload QR codeWikidata item Print/export Download as PDFPrintable version In other projects Wikimedia CommonsWikiversity From Wikipedia, the free encyclopedia Traditional first example of a computer programming language "Hello, World" redirects here. For other uses, see Hello World (disambiguation). A "Hello, World!" program is generally a simple computer program which outputs (or displays) to the screen (often the console) a message similar to "Hello, World!" while ignoring any user input. A small piece of code in most general-purpose programming languages, this program is used to illustrate a language's basic syntax. A "Hello, World!" program is often the first written by a student of a new programming language,[1] but such a program can also be used as a sanity check to ensure that the computer software intended to compile or run source code is correctly installed, and that its operator understands how to use it. History "Hello, World!" program handwritten in the C language and signed by Brian Kernighan (1978) While small test programs have 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 1978 book The C Programming Language,[2] with likely earlier use in BCPL. The example program from the book prints "hello, world", and was inherited from a 1974 Bell Laboratories internal memorandum by Brian Kernighan, Programming in C: A Tutorial:[3] main( ) printf("hello, world"); In the above example, the main( ) function defines where the program should start executing. The function body consists of a single statement, a call to the printf() function, which stands for "print formatted"; it outputs to the console whatever is passed to it as the parameter, in this case the string "hello, world". The C-language version was preceded by Kernighan's own 1972 A Tutorial Introduction to the Language B,[4] where the first known version of the program is found in an example used to illustrate external variables: main( ) extern a, b, c; putchar(a); putchar(b); putchar(c); putchar('!*n'); a 'hell'; b 'o, w'; c 'orld'; The program above prints hello, world! on the terminal, including a newline character. The phrase is divided into multiple variables because in B a character constant is limited to four ASCII characters. The previous example in the tutorial printed hi! on the terminal, and the phrase hello, world! was introduced as a slightly longer greeting that required several character constants for its expression.
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