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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!-- but may not be published or retransmitted without explicit permission.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 21:47:46 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/wchar.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:53 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 8.10</title><link href="sizeofchar.html" rev=precedes><link href="../bool/booltype.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="sizeofchar.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="../bool/booltype.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 8.10</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>I'm starting to think about multinational character sets,and I'm worried about the implicationsof making <TT>sizeof(char)</TT> be 2so that 16-bit character sets can be represented.</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>If type <TT>char</TT> were made 16 bits,<TT>sizeof(char)</TT> would still be 1,and <TT>CHAR_BIT</TT> in <TT><limits.h></TT> would be 16,and it would simply be impossible to declare(or allocate with <TT>malloc</TT>)a single 8-bit object.</p><p>Traditionally, a byte is not necessarily 8 bits, butmerely a smallish region of memory,usuallysuitablefor storing one character.The C Standardfollows this usage, sothe bytes used by <TT>malloc</TT>and <TT>sizeof</TT> can be more than 8 bits.<a href="octet.html" rel=subdocument>[footnote]</a>(The Standard does not allow them to be less.)</p><p>To allow manipulation of multinational character setswithout requiringan expansion of type <TT>char</TT>,ANSI/ISO C defines the ``wide'' character type <TT>wchar_t</TT>,and corresponding widestring literals,andfunctionsfor manipulatingand convertingstrings of wide characters.</p><p>See also question <a href="../malloc/sizeofchar.html">7.8</a>.</p><p>References:ISO Sec. 5.2.1.2, Sec. 6.1.3.4, Sec. 6.1.4, Sec. 7.1.6, Sec. 7.10.7, Sec. 7.10.8<br>Rationale Sec. 2.2.1.2<br>H&S Sec. 2.7.3 pp. 29-30, Sec. 2.7.4 p. 33, Sec. 11.1 p. 293, Secs. 11.7,11.8 pp. 303-310<br></p><!-- aend --><p><hr><a href="sizeofchar.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="../bool/booltype.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/wchar.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:53 GMT --></html>⌨️ 快捷键说明
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