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<html><head><title>XLISP or</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>or</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>special form (fsubr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlcont.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(or [<i>expr1</i> ... ])</dt>
<dd><i>exprN</i> - an expression<br>
returns - <a href="nil.htm">NIL</a> if all expressions evaluate
to <nobr><a href="nil.htm">NIL</a> ,</nobr> otherwise the value
of the first non-<a href="nil.htm">NIL</a> expression<br>
<b>Note:</b> evaluation of expressions stops after the first expression
that does not evaluate to <a href="nil.htm">NIL</a></dd>
</dl>
<h2>Description</h2>
<p>The 'or' special form evaluates a sequence of expressions and returns the
effect of a logical 'inclusive-or' operation on the expressions. If all of
the expressions are <nobr><a href="nil.htm">NIL</a> ,</nobr>
<a href="nil.htm">NIL</a> is returned as the result. Evaluation
of the expressions will stop when an expression evaluates to something other
than <nobr><a href="nil.htm">NIL</a> ,</nobr> none of the
subsequent expressions will be evaluated. If there are no expressions, 'or'
returns <a href="nil.htm">NIL</a> as its result.</p>
<h2>Examples</h2>
<pre class="example">
(or NIL NIL NIL) <font color="#008844">; returns NIL</font>
(or NIL T NIL) <font color="#008844">; returns T</font>
(or NIL (princ "hi") (princ "ho")) <font color="#008844">; prints hi and returns "hi"</font>
(or T T T) <font color="#008844">; returns T</font>
(or) <font color="#008844">; returns NIL</font>
(setq a 5) (setq b 6) <font color="#008844">; set up A and B</font>
(if (or (< a b) (< b a)) <font color="#008844">; if</font>
(print "not equal") <font color="#008844">; then</font>
(print "equal")) <font color="#008844">; else</font>
<font color="#008844">; prints "not equal"</font>
</pre>
<p>See the
<a href="../manual/xlisp-man-019.htm#or">or</a>
special form in the <nobr>XLISP 2.0</nobr> manual.</p>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
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