http://www.fenixdocs.com/index.php?action=history&feed=atom&title=Precompiler_ifndef 2026-05-02T17:03:36Z Revision history for this page on the wiki MediaWiki 1.10.1 http://www.fenixdocs.com/index.php?title=Precompiler_ifndef&diff=4120&oldid=prev 2007-12-30T13:55:35Z

<p>New page: <a href="/index.php/Category:Precompiler" title="Category:Precompiler">category:precompiler</a> == Definition == '''#ifndef''' &lt;what to check&gt; :&lt;if block&gt; ['''#else :&lt;else block&gt;] '''#endif''' Checks if ''what to check'' was previously defined in the code. ...</p> <p><b>New page</b></p><div>[[category:precompiler]]<br /> <br /> == Definition ==<br /> '''#ifndef''' &lt;what to check&gt;<br /> :&lt;if block&gt;<br /> ['''#else<br /> :&lt;else block&gt;]<br /> '''#endif'''<br /> <br /> Checks if ''what to check'' was previously defined in the code. If it isn't, the code in ''if block'' will be compiled. If it is, the code in ''else block'' will be compiled or when there is no ''else block'', the compiler will continue after [[precompiler_endif|#endif]].<br /> <br /> It is the opposite of [[precompiler_ifdef|#ifdef]].<br /> <br /> {{Precompiler_statements}}</div>

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