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<html><head><title>XLISP eql</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>eql</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>xllist.c, xlsubr.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<p><div class="box">
<dl>
<dt>(eql expr1 expr2)</dt>
<dd><i>expr1</i> - the first expression to compare<br>
<i>expr2</i> - the second expression to compare<br>
returns - <a href="t.htm"> T </a> if the expressions have the
same symbolic or numerical value, <a href="nil.htm">NIL</a> otherwise</dd>
</dl>
</div></p>
<h2>Description</h2>
<p>Two expressions are 'eql':</p>
<ul>
<li><p>If the expressions <nobr>are <a href="eq.htm">eq</a></nobr>.</p></li>
<li><p>If two numbers of the same type
<nobr>are <a href="number-equal.htm"> = </a></nobr>.</p></li>
<li><p>If two characters
<nobr>are <a href="char-equal-s.htm">char=</a></nobr>.</p></li>
</ul>
<p>In all other cases 'eql' <nobr>returns <a href="nil.htm">NIL</a></nobr>.
Note that arrays, lists, and strings are only 'eql' if they
<nobr>are <a href="eq.htm">eq</a></nobr>.</p>
<h2>Examples</h2>
<pre class="example">
(eql 'a 'a) => T
(eql 1 1) => T
(eql 1 1.0) => NIL
(eql 1.0 1.0) => T
(eql "a" "a") => NIL
(eql '(a b) '(a b)) => NIL
(eql 'a 34) => NIL
(setq a '(a b)) <font color="#008844">; set value of A to (A B)</font>
(setq b a) <font color="#008844">; set B to point to A's value</font>
(setq c '(a b)) <font color="#008844">; set value of C to different (A B)</font>
(eql a b) => T
(eql a c) => NIL
</pre>
<p>See also <a href="eq.htm">eq</a>, <a href="equal.htm">equal</a>,
<nobr><a href="../examples/common-lisp/equalp.htm">cl:equalp</a></nobr>.</p>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
<hr>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
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<a href="../examples/examples.htm">Examples</a> |
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