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<html><head><title>XLISP tagbody</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>tagbody</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>(tagbody [<i>expr</i> ... ])</dt>
<dd><i>expr</i> - expressions comprising the body of the block which may
contain <a href="go.htm">go</a>s or tags for
<a href="go.htm">go</a><br>
returns - <a href="nil.htm">NIL</a></dd>
</dl>
<h2>Description</h2>
<p>The 'tagbody' special form is basically a 'block' construct that contains
a block of code [expressions] to evaluate. After the execution of the
'tagbody' 'exprs', <a href="nil.htm">NIL</a> is returned. The
'tagbody' special form allows 'go-to' style branching within the 'block'
construct via the <a href="go.htm">go</a> special form. To allow
this, each 'expr' may be a tag or a form. The tag-symbol is the 'label' and
must exist somewhere within the 'block' that the <a
href="go.htm">go</a> occurs within.</p>
<h2>Examples</h2>
<pre class="example">
(tagbody <font color="#008844">; build the 'block'</font>
start (print "begin") <font color="#008844">; tag - start</font>
(GO end)
(print "hello") <font color="#008844">; won't ever be reached</font>
end (print "done")) <font color="#008844">; tag - END</font>
<font color="#008844">; prints "begin" "done"</font>
<font color="#008844">; returns NIL</font>
</pre>
<p>See the
<a href="../manual/xlisp-man-021.htm#tagbody">tagbody</a>
special form in the <nobr>XLISP 2.0</nobr> manual.</p>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
<hr>
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<a href="../manual/contents.htm">Contents</a> |
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