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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!-- but may not be published or retransmitted without explicit permission.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 misctechn.sgml dated Sat Sep 28 22:23:36 2002 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/misc/sd26.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 08:02:48 GMT --><head><meta name=GENERATOR content="faqproc"><link href="http://www.eskimo.com/notfound.html" rev=subdocument><title></title></head><body bgcolor="#ffffff"> <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>Here is a complete set of three functions for ``careful''addition, subtraction, and multiplication.<p>(Note: these functions all share one bug:they may fail if invoked on the largest negative integer, <TT>INT_MIN</TT>.)<pre>#include <stdio.h>#include <limits.h>intchkadd(int a, int b){ if(b < 0) return chksub(a, -b); if(INT_MAX - b < a) { fputs("int overflow\n", stderr); return INT_MAX; } return a + b;}intchksub(int a, int b){ if(b < 0) return chkadd(a, -b); if(INT_MIN + b > a) { fputs("int underflow\n", stderr); return INT_MIN; } return a - b;}intchkmul(int a, int b){ int sign = 1; if(a == 0 || b == 0) return 0; if(a < 0) { a = -a; sign = -sign; } if(b < 0) { b = -b; sign = -sign; } if(INT_MAX / b < a) { fputs("int overflow\n", stderr); return (sign > 0) ? INT_MAX : INT_MIN; } return sign * a * b;}</pre><hr><p><a href="intovf.html" rev=subdocument>back</a></p><hr><p><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><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></p></body><!-- Mirrored from c-faq.com/misc/sd26.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 08:02:51 GMT --></html>⌨️ 快捷键说明
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