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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!-- but may not be published or retransmitted without explicit permission.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 malloc.sgml dated Wed Dec 21 13:50:44 2005 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/malloc/attitude.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 7.3</title><link href="malloc2.html" rev=precedes><link href="lucky.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="malloc2.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="lucky.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 7.3</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>But theman pagefor <TT>strcat</TT> says thatit takes two <TT>char *</TT>'s as arguments.How amI supposed to know to allocate things?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>In general, when using pointers you<em>always</em>have to considermemory allocation,if onlyto make sure that the compiler is doing it for you.If alibrary function's documentation does not explicitly mention allocation,it is usually the caller's problem.</p><p>The Synopsis section at the top of aUnix-styleman pageor in the ANSI C standardcan be misleading.The code fragments presented there are closer to the functiondefinitions used by an implementorthan the invocations used by the caller.In particular, many functions which accept pointers(e.g. to structures or strings)are usually called witha pointer tosome object(a structure, or an array--see questions<a href="../aryptr/aryptrequiv.html">6.3</a> and<a href="../aryptr/aryptrparam.html">6.4</a>)which the callerhas allocated.Other common examples are<TT>time</TT>(see question <a href="../lib/curtime.html">13.12</a>)and<TT>stat</TT>.</p><!-- aend --><p><hr><a href="malloc2.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="lucky.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/malloc/attitude.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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