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<h1 class="chapter"> 5. Logical Operations </h1>
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<h3 class="unnumberedsubsec"> and </h3>
<table><tr><td> </td><td><pre class="example">AND tf1 tf2
(AND tf1 tf2 tf3 ...)
</pre></td></tr></table>
<p>outputs <code>TRUE</code> if all inputs are <code>TRUE</code>, otherwise <code>FALSE</code>. All inputs
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</p>
<table><tr><td> </td><td><pre class="example">MAKE "RESULT AND [NOT (:X = 0)] [(1 / :X) > .5]
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<p>to avoid the division by zero if the first part is false.
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<p>See section <a href="usermanual_11.html#SEC376">caseignoredp</a> .
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<h3 class="unnumberedsubsec"> or </h3>
<table><tr><td> </td><td><pre class="example">OR tf1 tf2
(OR tf1 tf2 tf3 ...)
</pre></td></tr></table>
<p>outputs <code>TRUE</code> if any input is <code>TRUE</code>, otherwise <code>FALSE</code>. All inputs
must be <code>TRUE</code> or <code>FALSE</code>. (Comparison is case-insensitive regardless
of the value of <code>CASEIGNOREDP</code>. That is, <code>true</code> or <code>True</code> or <code>TRUE</code>
are all the same.) An input can be a list, in which case it is
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or <code>FALSE</code> value. List expressions are evaluated from left to right;
as soon as a <code>TRUE</code> value is found, the remaining inputs are not
examined. Example:
</p>
<table><tr><td> </td><td><pre class="example">IF OR :X=0 [some.long.computation] [...]
</pre></td></tr></table>
<p>to avoid the long computation if the first condition is met.
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<p>See section <a href="usermanual_11.html#SEC376">caseignoredp</a> .
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<h3 class="unnumberedsubsec"> not </h3>
<table><tr><td> </td><td><pre class="example">NOT tf
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<p>outputs <code>TRUE</code> if the input is <code>FALSE</code>, and vice versa. The input can be
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expression must produce a <code>TRUE</code> or <code>FALSE</code> value.
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