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<html><head><title>XLISP write-byte</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>write-byte</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>xlfio.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(write-byte <i>expr</i> [<i>dest</i>])</dt>
<dd><i>expr</i> - an integer expression<br>
<i>dest</i> - an optional destination, must be a file pointer or stream,
default is <a href="global-standard-output.htm">*standard-output*</a><br>
returns - the byte as an integer</dd>
</dl>
<h2>Description</h2>
<p>The 'write-byte' function writes the 'expr' as a single byte to the
specified 'destination'. Only the 'expr' byte is written. The 'expr' must be
an integer expression. The 'expr' is returned as the result. The
'destination' may be a file pointer or a stream. If there is no
'destination', <a href="global-standard-output.htm">*standard-output*</a> is the
default.</p>
<h2>Examples</h2>
<pre class="example">
(write-byte 67) <font color="#008844">; prints C returns 67</font>
(setq fp (open "t" :direction :output)) <font color="#008844">; create file</font>
(write-byte 65 fp) <font color="#008844">; returns 65</font>
(write-byte 66 fp) <font color="#008844">; returns 66</font>
(write-byte 10 fp) <font color="#008844">; returns 10</font>
(close fp) <font color="#008844">; returns NIL</font>
(read (open "t" :direction :input)) <font color="#008844">; returns AB</font>
</pre>
<p><b>Common Lisp:</b> Common Lisp specifies that print operations with a
'destination' of <a href="nil.htm">NIL</a> will go to
<a href="global-standard-output.htm">*standard-output*</a>. XLISP does not send the
output to <a href="global-standard-output.htm">*standard-output*</a> with a
'destination' of <a href="nil.htm">NIL</a>. Common Lisp also
specifies that a 'destination' of
<a href="t.htm"> T </a> will be sent to
*terminal-io*, which is not defined in XLISP by default. XLISP does not
allow <a href="t.htm"> T </a> as a valid argument
for 'destination'.</p>
<p>See the
<a href="../manual/xlisp-man-029.htm#write-byte">write-byte</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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