docsrc/xlisp/xlisp-doc/reference/integerp.htm


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<html><head><title>XLISP integerp</title>

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<h1>integerp</h1>

<hr>

<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
  <td><nobr>Type:</nobr></td>
  <td><nobr>&nbsp;&nbsp;-&nbsp;&nbsp;</nobr></td>
  <td width="100%"><nobr>predicate function (subr)</nobr></td>
</tr>
<tr valign="top">
  <td><nobr>Source:</nobr></td>
  <td><nobr>&nbsp;&nbsp;-&nbsp;&nbsp;</nobr></td>
  <td width="100%"><nobr>xlbfun.c</nobr></td>
</tr>
</tbody></table></p>

<h2>Syntax</h2>

<dl>
<dt>(integerp <i>expr</i>)</dt>
<dd><i>expr</i> - the expression to check<br>
returns - <a href="t.htm">&nbsp;T&nbsp;</a> if the value is an
integer, <a href="nil.htm">NIL</a> otherwise</dd>
</dl>

<h2>Description</h2>

<p>The 'integerp' predicate function checks if an 'expr' is a integer
number. <a href="t.htm">&nbsp;T&nbsp;</a> is returned if
'expr' is a integer number,
<a href="nil.htm">NIL</a> is returned otherwise.</p>

<h2>Examples</h2>

<pre class="example">
(integerp 1)         <font color="#008844">; returns T - integer</font>
(integerp #x034)     <font color="#008844">; returns T - integer readmacro</font>
(integerp '1)        <font color="#008844">; returns T - still an integer</font>
(setq a 14)
(integerp a)         <font color="#008844">; returns T - evaluates to int.</font>
(integerp 0)         <font color="#008844">; returns T - integer zero</font>

(integerp 1.2)       <font color="#008844">; returns NIL - float</font>
(integerp 0.0)       <font color="#008844">; returns NIL - float zero</font>
(integerp 'a)        <font color="#008844">; returns NIL - symbol</font>
(integerp #\a)       <font color="#008844">; returns NIL - character</font>
(integerp NIL)       <font color="#008844">; returns NIL - NIL</font>
(integerp #(0 1 2))  <font color="#008844">; returns NIL - array</font>
</pre>

<p>See the
<a href="../manual/xlisp-man-018.htm#integerp">integerp</a>
predicate function in the <nobr>XLISP 2.0</nobr> manual.</p>

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