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<html><head><title>XLISP code-char</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
<hr>
<h1>code-char</h1>
<hr>
<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
<td><nobr>Type:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>function (subr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlstr.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(code-char <i>code</i>)</dt>
<dd><i>code</i> - a numeric expression representing the
<a href="../misc/ascii-table.htm">ASCII</a> code as an integer<br>
returns - the character with that code or <a href="nil.htm">NIL</a> </dd>
</dl>
<h2>Description</h2>
<p>The 'code-char' function returns a character which is the result of
turning 'code' expression into a character. If a 'code' cannot be made into
a character, <a href="nil.htm">NIL</a> is returned. The range
that 'code' produces a valid character is <nobr>0 through 127.</nobr></p>
<h2>Examples</h2>
<pre class="example">
(code-char 48) <font color="#008844">; returns #\0</font>
(code-char 65) <font color="#008844">; returns #\A</font>
(code-char 97) <font color="#008844">; returns #\a</font>
(code-char 91) <font color="#008844">; returns #\[</font>
(code-char 10) <font color="#008844">; returns #\Newline</font>
(code-char 128) <font color="#008844">; returns NIL</font>
(code-char 999) <font color="#008844">; returns NIL</font>
</pre>
<p><b>Common Lisp:</b> Common Lisp allows for some optional arguments in
'code-char' because it supports the concept of a complex character that
includes not only the ASCII code value, but also fonts and bits. The bits
allow for more than <nobr>8 bits</nobr> per character <nobr>[16 bits</nobr>
is especially useful in oriental languages]. The fonts allow for up to 128
different fonts. XLISP does not support fonts and bits or the optional
parameters associated with them.</p>
<p><b>Note:</b> Unlike the <a href="char-code.htm">char-code</a> and
<a href="char-int.htm">char-int</a> functions, 'code-char' and
<a href="int-char.htm">int-char</a> are not identical in use.
'code-char' accepts 0..127 for its range and then produces
<a href="nil.htm">NIL</a> results.
<a href="int-char.htm">int-char</a> accepts 0..255 for its range and
then produces errors.</p>
<p>See the
<a href="../manual/xlisp-man-026.htm#code-char">code-char</a>
function in the <nobr>XLISP 2.0</nobr> manual.</p>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
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