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HTML
54 lines
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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>2.2. Characters</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" Characters">
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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=tex2html1767 HREF="node22.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html1765 HREF="node15.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html1759 HREF="node20.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html1769 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html1770 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html1768 HREF="node22.html"> Standard Characters</A>
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<B>Up:</B> <A NAME=tex2html1766 HREF="node15.html"> Data Types</A>
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<B> Previous:</B> <A NAME=tex2html1760 HREF="node20.html"> Complex Numbers</A>
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<HR> <P>
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<H1><A NAME=SECTION00620000000000000000>2.2. Characters</A></H1>
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<P>
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Characters are represented as data objects of type <tt>character</tt>.
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<P>
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<img align=bottom alt="old_change_begin" src="gif/old_change_begin.gif"><br>
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There are two subtypes of interest,
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called <tt>standard-char</tt> and <tt>string-char</tt>.
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<br><img align=bottom alt="old_change_end" src="gif/old_change_end.gif">
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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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X3J13 voted in March 1989 (CHARACTER-PROPOSAL) <A NAME=872> </A> to remove the type <tt>string-char</tt>.
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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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A character object can be notated by writing <tt>#\</tt> followed
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by the character itself. For example, <tt>#\g</tt> means the character
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object for a lowercase g. This works well enough for printing
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characters. Non-printing characters have names, and can be notated
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by writing <tt>#\</tt> and then the name; for example, <tt>#\Space</tt>
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(or <tt>#\SPACE</tt> or <tt>#\space</tt> or <tt>#\sPaCE</tt>)
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means the space character. The syntax for character names after <tt>#\</tt>
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is the same as that for symbols. However, only character names
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that are known to the particular implementation may be used.
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<P>
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<HR>
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<UL>
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<LI> <A NAME=tex2html1771 HREF="node22.html#SECTION00621000000000000000"> Standard Characters</A>
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<LI> <A NAME=tex2html1772 HREF="node23.html#SECTION00622000000000000000"> Line Divisions</A>
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<LI> <A NAME=tex2html1773 HREF="node24.html#SECTION00623000000000000000"> Non-standard Characters</A>
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<LI> <A NAME=tex2html1774 HREF="node25.html#SECTION00624000000000000000"> Character Attributes</A>
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<LI> <A NAME=tex2html1775 HREF="node26.html#SECTION00625000000000000000"> String Characters</A>
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</UL>
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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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