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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>hello world</title><link rel="stylesheet" href="../../jargon.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.61.0"/><link rel="home" href="../index.html" title="The Jargon File"/><link rel="up" href="../H.html" title="H"/><link rel="previous" href="hello-sailor-.html" title="hello sailor!"/><link rel="next" href="hello--wall-.html" title="hello, wall!"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">hello world</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="hello-sailor-.html">Prev</a> </td><th width="60%" align="center">H</th><td width="20%" align="right"> <a accesskey="n" href="hello--wall-.html">Next</a></td></tr></table><hr/></div><dt><a id="hello-world"/><dt xmlns="" id="hello-world"><b>hello world</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">interj.</span></dt></dt><dd><p> 1. The canonical minimal test message in the C/Unix universe.
</p></dd><dd><p> 2. Any of the minimal programs that emit this message (a
representative sample in various languages can be found at <a href="http://www.latech.edu/~acm/helloworld/" target="_top">http://www.latech.edu/~acm/helloworld/</a>).
Traditionally, the first program a C coder is supposed to write in a new
environment is one that just prints &#8220;<span class="quote">hello, world</span>&#8221; to standard
output (and indeed it is the first example program in <a href="../K/K-ampersand-R.html"><i class="glossterm">K&amp;R</i></a>). Environments that generate
an unreasonably large executable for this trivial test or which require a
<a href="hairy.html"><i class="glossterm">hairy</i></a> compiler-linker invocation to generate it are
considered to <a href="../L/lose.html"><i class="glossterm">lose</i></a> (see <a href="../X/X.html"><i class="glossterm">X</i></a>).
</p></dd><dd><p> 3. Greeting uttered by a hacker making an entrance or requesting
information from anyone present. &#8220;<span class="quote">Hello, world! Is the LAN back up
yet?</span>&#8221;</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="hello-sailor-.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../H.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="hello--wall-.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">hello sailor! </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> hello, wall!</td></tr></table></div></body></html>