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


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<html><head><title>XLISP oddp</title>

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<a href="../start.htm">Nyquist / XLISP 2.0</a>&nbsp; -&nbsp;
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<hr>

<h1>oddp</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>xlmath.c</nobr></td>
</tr>
</tbody></table></p>

<h2>Syntax</h2>

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

<h2>Description</h2>

<p>The 'oddp' predicate function checks to see if the number 'expr' is odd.
<a href="t.htm">&nbsp;T&nbsp;</a> is returned if the number is
odd, <a href="nil.htm">NIL</a> is returned otherwise.</p>

<p>An error is generated if the 'expr' is not a numeric expression:</p>

<pre class="example">
<font color="#AA0000">error: bad argument type</font>
</pre>

<p>An error is generated if the 'expr' is a floating point number:</p>

<pre class="example">
<font color="#AA0000">error: bad floating point operation</font>
</pre>

<p>Zero is an even number.</p>

<h2>Examples</h2>

<pre class="example">
(oddp 0)     <font color="#008844">; returns NIL</font>
(oddp 1)     <font color="#008844">; returns T</font>
(oddp 2)     <font color="#008844">; returns NIL</font>
(oddp -1)    <font color="#008844">; returns T</font>
(oddp -2)    <font color="#008844">; returns NIL</font>

(oddp 13.0)  <font color="#008844">; error: bad floating point operation</font>
(oddp 'a)    <font color="#008844">; error: bad argument type</font>
(setq a 3)   <font color="#008844">; set value of A to 3</font>
(oddp a)     <font color="#008844">; returns T</font>
</pre>

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

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