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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!-- but may not be published or retransmitted without explicit permission.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/aryvsadr.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 6.12</title><link href="joke.html" rev=precedes><link href="ptrtoarray.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="joke.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="ptrtoarray.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 6.12</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>Since array references decay into pointers,if <TT>arr</TT> is an array,what'sthe difference between<TT>arr</TT> and <TT>&arr</TT>?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>The type.</p><p>InStandard C,<TT>&arr</TT> yields a pointer,of type pointer-to-array-of-T,to the entire array.(Inpre-ANSI C,the <TT>&</TT> in <TT>&arr</TT> generally elicited a warning,and was generallyignored.)Under all C compilers,asimplereference(without an explicit <TT>&</TT>)to an arrayyields a pointer,of type pointer-to-T,to the array's first element.</p><p>For a simple array<pre> int a[10];</pre>a reference to <TT>a</TT> has type ``pointer to <TT>int</TT>,''and <TT>&a</TT> is ``pointer to array of 10 <TT>int</TT>s.''For a two-dimensional array like<pre> int array[NROWS][NCOLUMNS];</pre>a reference to <TT>array</TT> has type``pointer to array of <TT>NCOLUMNS</TT> <TT>int</TT>s,''while <TT>&array</TT> has type``pointer to array of <TT>NROWS</TT> arrays of <TT>NCOLUMNS</TT> <TT>int</TT>s.''</p><p>Seealso questions<a href="aryptrequiv.html">6.3</a>,<a href="ptrtoarray.html">6.13</a>,and<a href="pass2dary.html">6.18</a>.</p><p>References:ISO Sec. 6.2.2.1, Sec. 6.3.3.2<br>Rationale Sec. 3.3.3.2<br>H&S Sec. 7.5.6 p. 198<br></p><!-- aend --><p><hr><a href="joke.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="ptrtoarray.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/aryvsadr.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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