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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!-- but may not be published or retransmitted without explicit permission.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/practdiff.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 6.8</title><link href="arraylval.html" rev=precedes><link href="constptr.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="arraylval.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="constptr.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 6.8</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>Practically speaking,whatis thedifference between arrays and pointers?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>An array is a single,preallocatedchunk of contiguous elements(all of the same type),fixed in size and location.A pointer is a reference to any data element(of a particular type)anywhere.A pointermust be assigned to point to space allocated elsewhere,but it can be reassigned(and the space, if derived from <TT>malloc</TT>, can be resized)at any time.A pointer can point to an array,and can simulate(along with <TT>malloc</TT>)a dynamically allocated array,but a pointer is a much more general data structure(see also question <a href="../ptrs/goodfor.html">4.1</a>).</p><p>Due to theso-calledequivalence of arrays and pointers(see question<a href="aryptrequiv.html">6.3</a>),arrays and pointers often seem interchangeable,and in particular a pointer to a block of memoryassigned by <TT>malloc</TT> is frequently treated(and can be referencedusing <TT>[]</TT>)exactlyas if it were a true array.See questions<a href="dynarray.html">6.14</a>and<a href="dynmuldimary.html">6.16</a>.(Be careful with <TT>sizeof</TT>;see question <a href="../malloc/sizeof.html">7.28</a>.)</p><p>See alsoquestions <a href="../decl/strlitinit.html">1.32</a>, <a href="ptrkindofary.html">6.10</a>, and <a href="../misc/eff2.html">20.14</a>.</p><!-- aend --><p><hr><a href="arraylval.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="constptr.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/practdiff.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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