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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!-- but may not be published or retransmitted without explicit permission.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 charstring.sgml dated Sat Feb 7 18:22:16 2004 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/charstring/strvschar.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:52 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 8.1</title><link href="../malloc/alloca.html" rev=precedes><link href="stringeq.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="../malloc/alloca.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="stringeq.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 8.1</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>Why doesn't<pre>strcat(string, '!');</pre>work?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>There is a very realdifferencebetween characters and strings,and<TT>strcat</TT> concatenates<em>strings</em>.</p><p>Acharacter constantlike<TT>'!'</TT> represents a single character.A string literal between double quotesusually represents multiple characters.A string literal like <TT>"!"</TT> seems to represent a single character,but it actually contains two:the <TT>!</TT> you requested,and the <TT>\0</TT> which terminates all strings in C.</p><p>Characters in C are represented by small integers corresponding to their character set values(see also question <a href="asciivals.html">8.6</a>).Strings are represented by arrays of characters;you usually manipulate a pointerto the first character of the array.It is never correct to use one when the other is expected.Toappend a <TT>!</TT> to a string,use<pre> strcat(string, "!");</pre></p><p>See also questions<a href="../decl/strlitinit.html">1.32</a>,<a href="../malloc/malloc2.html">7.2</a>,and<a href="../strangeprob/strlitnomod.html">16.6</a>.</p><p>References:CT&P Sec. 1.5 pp. 9-10<br></p><!-- aend --><p><hr><a href="../malloc/alloca.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="stringeq.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/charstring/strvschar.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:52 GMT --></html>⌨️ 快捷键说明
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