📄 transitivity.html
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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!-- but may not be published or retransmitted without explicit permission.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 expr.sgml dated Sat Jul 3 17:10:33 2004 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/expr/transitivity.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:47 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 3.13</title><link href="plusplus.html" rev=precedes><link href="intoverflow1.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="plusplus.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="intoverflow1.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 3.13</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>I need to check whether one number lies between two others.Why doesn't<pre>if(a < b < c)</pre>work?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>The relational operators,such as <TT><</TT>,are all binary;they compare two operands and returna true or false(1 or 0)result.Therefore, the expression<TT>a < b < c</TT> compares <TT>a</TT> to <TT>b</TT>,and then checks whether the resulting 1 or 0 is less than <TT>c</TT>.(To see it more clearly,imagine that it had been written as<TT>(a < b) < c</TT>,because that's how the compiler interprets it.)To check whether one number lies between two others,use code like this:<pre> if(a < b && b < c)</pre></p><p>References:K&R1 Sec. 2.6 p. 38<br>K&R2 Sec. 2.6 pp. 41-2<br>ISO Sec. 6.3.8, Sec. 6.3.9<br>H&S Secs. 7.6.4,7.6.5 pp. 207-210<br></p><!-- aend --><p><hr><a href="plusplus.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="intoverflow1.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/expr/transitivity.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:47 GMT --></html>⌨️ 快捷键说明
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