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<head><title>STANDARD-CO.html -- ACL2 Version 3.1</title></head>
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<h2>STANDARD-CO</h2>the character output channel to which <code><a href="LD.html">ld</a></code> prints
<pre>Major Section: <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
<code>Standard-co</code> is an <code><a href="LD.html">ld</a></code> special (see <a href="LD.html">ld</a>). The accessor is
<code>(standard-co state)</code> and the updater is <code>(set-standard-co val state)</code>.
<code>Standard-co</code> must be an open character output channel. It is to this
channel that <code><a href="LD.html">ld</a></code> prints the <a href="PROMPT.html">prompt</a>, the form to be evaluated, and the
results. The event <a href="COMMAND.html">command</a>s such as <code><a href="DEFUN.html">defun</a></code>, <code><a href="DEFTHM.html">defthm</a></code>, etc., which
print extensive commentary do not print to <code>standard-co</code> but rather to
a different channel, <code><a href="PROOFS-CO.html">proofs-co</a></code>, so that you may redirect this
commentary while still interacting via <code>standard-co</code>.
See <a href="PROOFS-CO.html">proofs-co</a>.
<p>
``Standard-co'' stands for ``standard character output.'' The
initial value of <code>standard-co</code> is the same as the value of
<code><a href="_star_STANDARD-CO_star_.html">*standard-co*</a></code> (see <a href="_star_STANDARD-CO_star_.html">*standard-co*</a>).
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