41 lines
2.1 KiB
HTML
41 lines
2.1 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Converted with LaTeX2HTML 0.6.5 (Tue Nov 15 1994) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE>26.1. Introduction</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" Introduction">
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<meta name="keywords" value="clm">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<b>Common Lisp the Language, 2nd Edition</b>
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<BR> <HR><A NAME=tex2html4519 HREF="node237.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html4517 HREF="node235.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html4511 HREF="node235.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html4521 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html4522 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4520 HREF="node237.html"> How the Loop </A>
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<B>Up:</B> <A NAME=tex2html4518 HREF="node235.html"> Loop</A>
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<B> Previous:</B> <A NAME=tex2html4512 HREF="node235.html"> Loop</A>
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<HR> <P>
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<H1><A NAME=SECTION003010000000000000000>26.1. Introduction</A></H1>
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<P>
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<img align=bottom alt="change_begin" src="gif/change_begin.gif"><br>
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A <i>loop</i> is a series of expressions that are executed one or more times,
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a process known as <i>iteration</i>.
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The <i>Loop Facility</i> defines a
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variety of useful methods, indicated by
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<i>loop keywords</i>, to iterate and to
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accumulate values in a loop.
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<P>
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Loop keywords are not true Common Lisp keywords; they are symbols that
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are recognized by the Loop Facility and that provide such capabilities
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as controlling the direction of iteration, accumulating values inside
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the body of a loop, and evaluating expressions that precede or follow
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the loop body. If you do not use any loop keywords, the Loop Facility
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simply executes the loop body repeatedly.
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<br><img align=bottom alt="change_end" src="gif/change_end.gif">
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<P>
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<HR>
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<P><ADDRESS>
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AI.Repository@cs.cmu.edu
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</ADDRESS>
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</BODY>
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