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<a name="Initialize-variable-argument-list-1"></a>
<h4 class="subsection">14.2.2 Initialize variable argument list</h4>
<a name="index-va_005fstart-1"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;varargs.h&gt;
va_list <var>ap</var>;
va_start(<var>ap</var>);
</pre></div>

<p><strong>Description</strong><br>
With the <samp>varargs.h</samp> macros, use <code>va_start</code> to initialize a
data structure <var>ap</var> to permit manipulating a variable argument list.
<var>ap</var> must have the type <var>va_alist</var>.
</p>
<p><strong>Returns</strong><br>
<code>va_start</code> does not return a result.
</p>
<p><strong>Portability</strong><br>
<code>va_start</code> is also defined as a macro in ANSI C, but the
definitions are incompatible; the ANSI version has another parameter
besides <var>ap</var>.
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