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<html><head><title>XLISP lognot</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
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<hr>
<h1>lognot</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>xlmath.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(lognot <i>expr</i>)</dt>
<dd><i>expr</i> - an integer expression<br>
returns - the bitwise inversion of number</dd>
</dl>
<h2>Description</h2>
<p> The 'lognot' function returns the logical bitwise inversion of the
expression.</p>
<h2>Examples</h2>
<pre class="example">
(lognot 255) <font color="#008844">; returns -256</font>
(lognot #xffff0000) <font color="#008844">; returns 65535</font>
(lognot #x00000000) <font color="#008844">; returns -1</font>
(lognot 1) <font color="#008844">; returns -2</font>
(logand (lognot 256) 65535) <font color="#008844">; returns 65279</font>
(lognot #xFFFFFFFE) <font color="#008844">; returns 1</font>
(lognot #xFFFFFFFC) <font color="#008844">; returns 3</font>
</pre>
<p><b>Note:</b> XLISP does not check when read-macro expansions like '#x0FF'
are out of bounds. It gives no error message and will just truncate the
number to the low-order bits that it can deal with [usually 32 bits or 8 hex
digits].</p>
<p>See the
<a href="../manual/xlisp-man-024.htm#lognot">lognot</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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