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<h4 class="subsection">17.4.2 <code>@ifset</code> and <code>@ifclear</code></h4>

<p><a name="index-ifset-1030"></a>When a <var>flag</var> is set, the Texinfo formatting commands format text
between subsequent pairs of <code>@ifset </code><var>flag</var> and <code>@end
ifset</code> commands.  When the <var>flag</var> is cleared, the Texinfo formatting
commands do <em>not</em> format the text.  <code>@ifclear</code> operates
analogously.

  <p>Write the conditionally formatted text between <code>@ifset </code><var>flag</var>
and <code>@end ifset</code> commands, like this:

<pre class="example">     @ifset <var>flag</var>
     <var>conditional-text</var>
     @end ifset
</pre>
  <p>For example, you can create one document that has two variants, such as
a manual for a `large' and `small' model:

  <p><a name="index-Shrubbery-1031"></a>
<pre class="example">     You can use this machine to dig up shrubs
     without hurting them.
     
     @set large
     
     @ifset large
     It can also dig up fully grown trees.
     @end ifset
     
     Remember to replant promptly ...
</pre>
  <p class="noindent">In the example, the formatting commands will format the text between
<code>@ifset large</code> and <code>@end ifset</code> because the <code>large</code>
flag is set.

  <p>When <var>flag</var> is cleared, the Texinfo formatting commands do
<em>not</em> format the text between <code>@ifset </code><var>flag</var> and
<code>@end ifset</code>; that text is ignored and does not appear in either
printed or Info output.

  <p>For example, if you clear the flag of the preceding example by writing
an <code>@clear large</code> command after the <code>@set large</code> command
(but before the conditional text), then the Texinfo formatting commands
ignore the text between the <code>@ifset large</code> and <code>@end ifset</code>
commands.  In the formatted output, that text does not appear; in both
printed and Info output, you see only the lines that say, &ldquo;You can use
this machine to dig up shrubs without hurting them.  Remember to replant
promptly <small class="dots">...</small>&rdquo;.

  <p><a name="index-ifclear-1032"></a>If a flag is cleared with an <code>@clear </code><var>flag</var> command, then
the formatting commands format text between subsequent pairs of
<code>@ifclear</code> and <code>@end ifclear</code> commands.  But if the flag
is set with <code>@set </code><var>flag</var>, then the formatting commands do
<em>not</em> format text between an <code>@ifclear</code> and an <code>@end
ifclear</code> command; rather, they ignore that text.  An <code>@ifclear</code>
command looks like this:

<pre class="example">     @ifclear <var>flag</var>
</pre>
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