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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!-- but may not be published or retransmitted without explicit permission.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 init.sgml dated Fri Jul 2 21:52:44 2004 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/decl/strlitinit.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:45 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 1.32</title><link href="fcninit.html" rev=precedes><link href="nonstring.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="fcninit.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="nonstring.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 1.32</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>What is the difference betweenthese initializations?<pre>char a[] = "string literal";char *p = "string literal";</pre>My programcrashes ifI try toassign a new value to <TT>p[i]</TT>.</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>A string literal(the formaltermfor a double-quoted string in C source)canbe used intwo slightly differentways:<OL><li>Asthe initializer for an array of <TT>char</TT>,as in thedeclaration of <TT>char a[]</TT>,it specifies the initial values of the characters in that array(and, if necessary, its size).<li>Anywhere else,it turns into an unnamed,staticarray of characters,and this unnamed arraymay be stored in read-only memory,and which therefore cannot necessarily be modified.Inan expression context,thearray is converted at onceto a pointer,as usual(see section <a href="../aryptr/index.html">6</a>),sothe second declaration initializes<TT>p</TT>to point totheunnamedarray'sfirst element.</OL></p><p>Somecompilershave a switch controlling whetherstring literalsare writableor not(for compiling old code),and somemayhave options to cause string literals to beformallytreated as arrays of <TT>const</TT> <TT>char</TT>(for better error catching).</p><p>See also questions<a href="autoaggrinit.html">1.31</a>,<a href="../aryptr/aryptr1.html">6.1</a>,<a href="../aryptr/aryptr2.html">6.2</a>,<a href="../aryptr/practdiff.html">6.8</a>,and<a href="../ansi/strlitnotconst.html">11.8b</a>.</p><p>References:K&R2 Sec. 5.5 p. 104<br>ISO Sec. 6.1.4, Sec. 6.5.7<br>Rationale Sec. 3.1.4<br>H&S Sec. 2.7.4 pp. 31-2<br></p><!-- aend --><p><hr><a href="fcninit.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="nonstring.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/decl/strlitinit.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:45 GMT --></html>⌨️ 快捷键说明
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