1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
<html><head><title>XLISP progn</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>progn</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, xllist.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(progn [expr1 expr2 ... ])</dt>
<dd><i>exprN</i> - expressions comprising the body of the loop<br>
returns - the value of the last expression</dd>
</dl>
<h2>Description</h2>
<p>The 'progn' special form is basically a 'block' construct that contains a
block of code [expressions] to evaluate. The value of the last expression
'exprN' will be returned as the result of 'progn'. If there are no 'exprs',
<a href="nil.htm">NIL</a> is returned.</p>
<h2>Examples</h2>
<pre class="example">
(progn (print "hi") (print "ho")) <font color="#008844">; prints "hi" "ho" returns "ho"</font>
(progn) <font color="#008844">; returns NIL</font>
(progn "hey" (print "ho")) <font color="#008844">; prints "ho" returns "ho"</font>
(progn 'a) <font color="#008844">; returns A</font>
(progn 'a 'b 'c) <font color="#008844">; returns C</font>
</pre>
<p><b>Note:</b> <nobr><a href="prog1.htm">prog1</a> ,</nobr>
<nobr><a href="prog2.htm">prog2</a> ,</nobr>
'progn' and
<a href="progv.htm">progv</a> do not allow the use of
<a href="return.htm">return</a> or
<a href="go.htm">go</a> or tags for
<a href="go.htm">go</a>.</p>
<p>See the
<a href="../manual/xlisp-man-021.htm#progn">progn</a>
special form 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>
|
