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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN"><!-- This collection of hypertext pages is Copyright 1995-2005 by Steve Summit. --><!-- Content from the book "C Programming FAQs: Frequently Asked Questions" --><!-- (Addison-Wesley, 1995, ISBN 0-201-84519-9) is made available here by --><!-- permission of the author and the publisher as a service to the community. --><!-- It is intended to complement the use of the published text --><!-- and is protected by international copyright laws. --><!-- The on-line content may be accessed freely for personal use --><!-- but may not be published or retransmitted without explicit permission. --><!-- --><!-- this page built Sat Dec 24 21:47:45 2005 by faqproc version 2.7 --><!-- from source file aryptr.sgml dated Wed Dec 21 12:50:38 2005 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/aryptr/dynlocarys.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:49 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 6.15</title><link href="dynarray.html" rev=precedes><link href="dynmuldimary.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="dynarray.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="dynmuldimary.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../index-2.html"><img src="../images/buttontop.gif" alt="top/contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><hr><p><!-- qbegin --><h1>comp.lang.c FAQ list<font color=blue>·</font><!-- qtag -->Question 6.15</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>How can I declare local arrays of a size matching a passed-in array?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>Until recently, youcouldn't; arraydimensionsin Ctraditionallyhad to becompile-time constants.However,C99 introducesvariable-length arrays(VLA's)which solve this problem;local arrays may have sizes set by variables or other expressions,perhaps involving function parameters.(<TT>gcc</TT>has provided parameterized arraysas an extensionfor some time.)If you can't use C99 or <TT>gcc</TT>,you'llhave to use <TT>malloc</TT>,and remember to call <TT>free</TT> before the function returns.See also questions<a href="dynarray.html">6.14</a>,<a href="dynmuldimary.html">6.16</a>,<a href="ary2dfunc2.html">6.19</a>,<a href="../malloc/local.html">7.22</a>,and maybe <a href="../malloc/alloca.html">7.32</a>.</p><p>References:ISO Sec. 6.4, Sec. 6.5.4.2<br>C9X Sec. 6.5.5.2<br></p><!-- aend --><p><hr><a href="dynarray.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="dynmuldimary.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../questions.html"><img src="../images/buttontop.gif" alt="contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><br><!-- lastfooter --><a href="../about.html">about this FAQ list</a> <a href="../eskimo.html">about eskimo</a> <a href="../search.html">search</a> <a href="../feedback.html">feedback</a> <a href="copyright.html">copyright</a><p>Hosted by<a href="http://www.eskimo.com/"><img src="../../www.eskimo.com/img/link/eskitiny.gif" alt="Eskimo North"></a></body><!-- Mirrored from c-faq.com/aryptr/dynlocarys.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:49 GMT --></html>⌨️ 快捷键说明
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