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<html><head><title>XLISP symbol-value</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>symbol-value</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>xlbfun.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(symbol-value <i>symbol</i>)</dt>
<dd><i>symbol</i> - an expression that evaluates to a symbol name<br>
returns - the symbol's value</dd>
</dl>
<h2>Description</h2>
<p>The 'symbol-value' function takes the 'symbol' expression and returns
the current value of the 'symbol'.</p>
<p>If the 'symbol' had not existed, then it will be created and
<a href="intern.htm">intern</a>ed into the system symbol table
<nobr><a href="global-obarray.htm">*obarray*</a> ,</nobr> but with it's
value unbound and an empty property list. In this case of a previously
non-existant 'symbol', since it has no bound value, the 'symbol-value'
function will still report an error due to an unbound variable.</p>
<h2>Examples</h2>
<pre class="example">
(setq myvar 55) <font color="#008844">; set MYVAR to value 55</font>
(symbol-value 'myvar) <font color="#008844">; returns 55</font>
(symbol-value 'floop) <font color="#008844">; error: unbound variable</font>
(setq my-symbol 'a) <font color="#008844">; set MY-SYMBOL to A</font>
(setq a '(contents of symbol a)) <font color="#008844">; set A to value (CONTENTS OF SYMBOL A)</font>
(symbol-value my-symbol) <font color="#008844">; returns (CONTENTS OF SYMBOL A)</font>
</pre>
<p>See the
<a href="../manual/xlisp-man-013.htm#symbol-value">symbol-value</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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