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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!-- but may not be published or retransmitted without explicit permission.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 osdepio.sgml dated Sat Jul 3 17:23:16 2004 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/osdep/baton.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:02 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 19.3</title><link href="readavail.html" rev=precedes><link href="termcap.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="readavail.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="termcap.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 19.3</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>How can I display apercentage-done indicationthat updates itself in place,or show one of those``twirling baton''progress indicators?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>These simple things, at least, you can do fairly portably.Printingthecharacter <TT>'\r'</TT>will usually give youa carriage returnwithout a line feed, so that you can overwrite the current line.The character<TT>'\b'</TT>is a backspace,and will usually move the cursor onepositionto the left.</p><p>Using these characters,you can print a percentage-done indicator:<pre> for(i = 0; i < lotsa; i++) { printf("\r%3d%%", (int)(100L * i / lotsa)); fflush(stdout); do_timeconsuming_work(); } printf("\ndone.\n");</pre>or a baton:<pre> printf("working: "); for(i = 0; i < lotsa; i++) { printf("%c\b", "|/-\\"[i%4]); fflush(stdout); do_timeconsuming_work(); } printf("done.\n");</pre></p><p>See also question <a href="../stdio/fflush.html">12.4</a>.</p><p>References:ISO Sec. 5.2.2<br></p><!-- aend --><p><hr><a href="readavail.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="termcap.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/osdep/baton.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:02 GMT --></html>⌨️ 快捷键说明
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