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<html><head><title>XLISP characterp</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>characterp</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>xlbfun.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<p><div class="box">
<dl>
<dt>(<b>characterp</b> <i>expr</i>)</dt>
<dd><i>expr</i> - the expression to check<br>
returns - <a href="t.htm"> T </a> if the value is a
character, <a href="nil.htm">NIL</a> otherwise</dd>
</dl>
</div></p>
<h2>Description</h2>
<p>The 'characterp' predicate function tests if 'expr' evaluates to a
character. <nobr><a href="t.htm"> T </a> is</nobr> returned if
'expr' evaluates to a character, <a href="nil.htm">NIL</a> is returned
otherwise.</p>
<h2>Examples</h2>
<pre class="example">
(characterp #\a) => T <font color="#008844">; character</font>
(setq a #\b) => #\b
(characterp a) => T <font color="#008844">; evaluates to a character</font>
(characterp "a") => NIL <font color="#008844">; string</font>
(characterp '(a b c)) => NIL <font color="#008844">; list</font>
(characterp 1) => NIL <font color="#008844">; integer</font>
(characterp 1.2) => NIL <font color="#008844">; float</font>
(characterp 'a) => NIL <font color="#008844">; symbol</font>
(characterp #(0 1 2)) => NIL <font color="#008844">; array</font>
(characterp nil) => NIL <font color="#008844">; NIL</font>
</pre>
<p>See also:</p>
<ul>
<li><nobr>Contents → <a href="../manual/contents.htm#predicate-functions">Predicate Functions</a></nobr></li>
<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> |
<a href="reference-index.htm">Reference</a>
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