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<html><head><title>XLISP alphanumericp</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>alphanumericp</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>predicate 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>
<p><div class="box">
<dl>
<dt>(<b>alphanumericp</b> <i>char</i>)</dt>
<dd>char - a character expression<br>
returns - <a href="t.htm"> T </a> if the character
is alphabetic or a digit, <a href="nil.htm">NIL</a> otherwise</dd>
</dl>
</div></p>
<h2>Description</h2>
<p> The 'alphanumericp' function checks if the 'char' expression is an
alphabetic or a digit character. <nobr>If 'char'</nobr> is an alphabetic
[either an upper or lower case] or a digit character,
<a href="t.htm"> T </a> is returned, otherwise
<a href="nil.htm">NIL</a> is returned. Note that XLISP is limited to
<a href="../misc/ascii-table.htm">ASCII</a> characters, so there is no way
to find out if an Unicode character with a
<nobr><a href="char-code.htm">char-code</a></nobr> greater than
<nobr>ASCII 127</nobr> is alphanumeric <nobr>or not</nobr>.</p>
<h2>Examples</h2>
<pre class="example">
(alphanumericp #\A) => T
(alphanumericp #\a) => T
(alphanumericp #\1) => T
(alphanumericp #\[) => NIL
</pre>
<p>See also:</p>
<ul>
<li><nobr>Contents → <a href="../manual/contents.htm#character-functions">Character Functions</a></nobr></li>
</ul>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
<hr>
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<a href="../manual/contents.htm">Contents</a> |
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<a href="../examples/examples.htm">Examples</a> |
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