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<h3 class="section">6.1 Values</h3>
<p><a name="index-built_002din-values-16"></a>The following variables are special and can be accessed anytime. They can
even be overwritten.
<pre class="verbatim">args, return, temp, stdin, stderr, stdout, zero, true, false, none, @pi,
@e, cwd, cpd, fnm
</pre>
<code>zero</code> is a fake writable file that does nothing. <code>none</code> is an
abstract variable with an internal value of.. none. <code>@pi</code> is
Pi. <code>@e</code> is Euler's number. <code>cwd</code> is the directory from which
Enigma is run, <code>cpd</code> is the directory in which the current program
file resides, and <code>fnm</code> is the filename of the current program
file. The rest are self-explanatory — and <code>args</code>, <code>return</code>
and <code>temp</code> are extra special.
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