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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!-- but may not be published or retransmitted without explicit permission.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 21:47:47 2005 by faqproc version 2.7 --><!-- from source file misclang.sgml dated Wed Dec 21 13:02:49 2005 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/misc/nestcomment.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:05 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 20.20</title><link href="returnparens.html" rev=precedes><link href="multibreak.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="returnparens.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="multibreak.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 20.20</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>Why don't C comments nest?How am I supposed to comment out code containing comments?Arecommentslegal inside quoted strings?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>C comments don't nestmostlybecause PL/I's comments,which C's are borrowed from,don't either.Therefore,it is usually better to ``comment out''large sections of code, which might contain comments, with<TT>#ifdef</TT> or <TT>#if 0</TT>(but see question<a href="../ansi/ifdefsyntax.html">11.19</a>).</p><p>The character sequences <TT>/*</TT> and <TT>*/</TT> arenot special within double-quotedstrings,and do not therefore introduce comments,because a program(particularly one which is generating C code as output)might want to print them.(It is hard to imagine why anyone would want or need to place acomment inside a quoted string.It is easy to imagine a program needing to print "<TT>/*</TT>".)</p><p>Note also that <TT>//</TT> commentshave only become legal in C as of C99.</p><p>References:K&R1 Sec. A2.1 p. 179<br>K&R2 Sec. A2.2 p. 192<br>ISO Sec. 6.1.9, Annex F<br>Rationale Sec. 3.1.9<br>H&S Sec. 2.2 pp. 18-9<br>PCS Sec. 10 p. 130<br></p><!-- aend --><p><hr><a href="returnparens.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="multibreak.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/misc/nestcomment.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:05 GMT --></html>⌨️ 快捷键说明
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