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<span class="refentrytitle">#ifndef</span>
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<p>#ifndef —
Conditional reading of code.
</p>
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
If the specified macro is not defined then <span class="emphasis"><em>#ifndef</em></span> can
incorporate text into an orchestra upto the next
<span class="emphasis"><em>#end</em></span>.
This is similar to, but independent of, the <a class="link" href="ScoreMacros.html" title="Score Macros"><em class="citetitle">macro system in the score
language</em></a>.
</p>
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>#ifndef</strong></span> NAME</pre>
<pre class="synopsis">....</pre>
<pre class="synopsis"><span class="command"><strong>#else</strong></span> </pre>
<pre class="synopsis">....</pre>
<pre class="synopsis"><span class="command"><strong>#end</strong></span> </pre>
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<div class="refsect1" title="Performance">
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<h2>Performance</h2>
<p>
Note that the <span class="emphasis"><em>#ifndef</em></span> can be nested, like in the C preprocessor language.
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<div class="refsect1" title="See Also">
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<h2>See Also</h2>
<p>
<a class="link" href="dollar.html" title="$NAME"><em class="citetitle">$NAME</em></a>,
<a class="link" href="define.html" title="#define"><em class="citetitle">#define</em></a>,
<a class="link" href="ifdef.html" title="#ifdef"><em class="citetitle">#ifdef</em></a>.
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<h2>Credits</h2>
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<td>Author: John ffitch</td>
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<td>University of Bath/Codemist Ltd.</td>
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<td>Bath, UK</td>
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<td>April 2005</td>
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<p>New in Csound5 (and 4.23f13)</p>
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