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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!-- but may not be published or retransmitted without explicit permission.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 ansi.sgml dated Wed Aug 11 00:43:45 2004 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/ansi/appalled.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:56 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 11.34</title><link href="compliance.html" rev=precedes><link href="experiment.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="compliance.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="experiment.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 11.34</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>I'm appalled that the ANSI Standard leaves so many issues undefined.Isn't a Standard's whole job to standardize these things?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>It has always been a characteristic of C that certainconstructs behavedin whatever waya particular compileror a particular piece of hardwarechose to implement them.This deliberate imprecisionoftenallows compilers to generatemore efficient code for common cases,without having to burden all programswithextra code toassure well-defined behaviorof cases deemed to be less reasonable.Therefore,the Standard is simply codifying existing practice.</p><p>A programming language standard can be thought ofas a treaty between thelanguage userand thecompiler implementor.Parts of that treaty consist offeatures which the compiler implementor agrees to provide,and which the user may assume will be available.Other parts, however,consist of rules which the user agrees to followand which the implementor may assume will be followed.As long as both sides uphold their guarantees,programs have a fighting chance of working correctly.If <em>either</em> side reneges on any of its commitments,nothing is guaranteed to work.</p><p>See alsoquestions <a href="experiment.html">11.35</a> and <a href="../osdep/sysdep.html">19.42</a>.</p><p>References:Rationale Sec. 1.1<br></p><!-- aend --><p><hr><a href="compliance.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="experiment.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/ansi/appalled.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:56 GMT --></html>⌨️ 快捷键说明
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