diff options
author | Steve M. Robbins <smr@debian.org> | 2011-10-22 04:54:51 +0200 |
---|---|---|
committer | Steve M. Robbins <smr@debian.org> | 2011-10-22 04:54:51 +0200 |
commit | dd657ad3f1428b026486db3ec36691df17ddf515 (patch) | |
tree | 6ffb465595479fb5a76c1a6ea3ec992abaa8c1c1 /docsrc/xlisp/xlisp-doc/reference/global-unbound.htm |
Import nyquist_3.05.orig.tar.gz
[dgit import orig nyquist_3.05.orig.tar.gz]
Diffstat (limited to 'docsrc/xlisp/xlisp-doc/reference/global-unbound.htm')
-rw-r--r-- | docsrc/xlisp/xlisp-doc/reference/global-unbound.htm | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/docsrc/xlisp/xlisp-doc/reference/global-unbound.htm b/docsrc/xlisp/xlisp-doc/reference/global-unbound.htm new file mode 100644 index 0000000..424b603 --- /dev/null +++ b/docsrc/xlisp/xlisp-doc/reference/global-unbound.htm @@ -0,0 +1,70 @@ +<html><head><title>XLISP *unbound*</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>*unbound*</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>system constant</nobr></td>
+</tr>
+<tr valign="top">
+ <td><nobr>Source:</nobr></td>
+ <td><nobr> - </nobr></td>
+ <td width="100%"><nobr>xlinit.c, xlsym.c</nobr></td>
+</tr>
+</tbody></table></p>
+
+<h2>Syntax</h2>
+
+<dl>
+<dt> *unbound*</dt>
+</dl>
+
+<h2>Description</h2>
+
+<p>The *unbound* system constant is used to indicate when a symbol has no
+value. *unbound* is set to the value *unbound*. This means that the system
+thinks the symbol *unbound* has no value.</p>
+
+<h2>Examples</h2>
+
+<pre class="example">
+*unbound* <font color="#008844">; error: unbound variable</font>
+(setq a 5) <font color="#008844">; returns 5</font>
+a <font color="#008844">; returns 5</font>
+(setq a '*unbound*) <font color="#008844">; returns *UNBOUND*</font>
+a <font color="#008844">; error: unbound variable</font>
+</pre>
+
+<p>See the
+<a href="../manual/xlisp-man-011.htm#unbound">*unbound*</a>
+system constant in the <nobr>XLISP 2.0</nobr> manual.</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> |
+<a href="../tutorials/tutorials.htm">Tutorials</a> |
+<a href="../examples/examples.htm">Examples</a> |
+<a href="reference-index.htm">Reference</a>
+
+</body></html>
\ No newline at end of file |