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<a name="ANSI_002dstandard-macros_002c-stdarg_002eh"></a>
<h3 class="section">13.1 ANSI-standard macros, <samp>stdarg.h</samp></h3>
<p>In ANSI C, a function has a variable number of arguments when its
parameter list ends in an ellipsis (<code>...</code>). The parameter list
must also include at least one explicitly named argument; that argument
is used to initialize the variable list data structure.
</p>
<p>ANSI C defines three macros (<code>va_start</code>, <code>va_arg</code>, and
<code>va_end</code>) to operate on variable argument lists. <samp>stdarg.h</samp>
also defines a special type to represent variable argument lists: this
type is called <code>va_list</code>.
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