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<div id="contentSub"><span class="subpages">&lt; <a href="c.html">c</a>&lrm; | <a href="c-variadic.html">variadic</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;stdarg.h&gt;</code></div>
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<div><span class="mw-geshi c source-c"><span class="kw4">void</span> va_start<span class="br0">(</span> va_list ap, parmN <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p><code>va_start</code> &#23439;&#20351;&#20989;&#25968;&#33021;&#35775;&#38382;<code>parmN</code>&#21518;&#30340;&#21487;&#21464;&#21442;&#25968;&#12290;</p>
<p>&#24212;&#35813;&#22312;&#20219;&#20309;&#23545; <span class="t-lc">va_arg</span> &#30340;&#35843;&#29992;&#21069;&#65292;&#20197;&#21512;&#27861;&#30340; <span class="t-lc">va_list</span> &#23545;&#35937; <code>ap</code> &#35843;&#29992; <code>va_start</code> &#12290;</p>
<p>&#33509; <code>parmN</code> &#22768;&#26126;&#24102;&#26377; <code>register</code> &#23384;&#20648;&#31867;&#25351;&#23450;&#31526;&#12289;&#25968;&#32452;&#31867;&#22411;&#12289;&#20989;&#25968;&#31867;&#22411;&#65292;&#25110;&#19982;&#40664;&#35748;&#21442;&#25968;&#25552;&#21319;&#32467;&#26524;&#31867;&#22411;&#19981;&#20860;&#23481;&#30340;&#31867;&#22411;&#65292;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>ap</td>
<td>-</td>
<td><span class="t-lc">va_list</span> &#31867;&#22411;&#23454;&#20363;</td>
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<td>parmN</td>
<td>-</td>
<td>&#39318;&#20010;&#21487;&#21464;&#21442;&#25968;&#21069;&#30340;&#21442;&#25968;&#21517;</td>
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<h3><span class="mw-headline" id=".E5.B1.95.E5.BC.80.E5.80.BC">&#23637;&#24320;&#20540;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;stdarg.h&gt;</span>
<span class="kw4">int</span> add_nums<span class="br0">(</span><span class="kw4">int</span> count, ...<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">int</span> result <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
va_list args<span class="sy4">;</span>
va_start<span class="br0">(</span>args, count<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">int</span> i <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> i <span class="sy1">&lt;</span> count<span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span> <span class="br0">{</span>
result <span class="sy2">+</span><span class="sy1">=</span> va_arg<span class="br0">(</span>args, <span class="kw4">int</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
va_end<span class="br0">(</span>args<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> result<span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">&quot;%d<span class="es1">\n</span>&quot;</span>, add_nums<span class="br0">(</span><span class="nu0">4</span>, <span class="nu0">25</span>, <span class="nu0">25</span>, <span class="nu0">50</span>, <span class="nu0">50</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#21487;&#33021;&#30340;&#36755;&#20986;&#65306;</p>
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<pre class="de1">150</pre></div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
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<li>C11 &#26631;&#20934;&#65288;ISO/IEC 9899:2011&#65289;&#65306;</li>
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<li>7.16.1.4 The va_start macro (p: 271-272)</li>
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<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
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<li>7.15.1.4 The va_start macro (p: 251-252)</li>
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<li>C89/C90 &#26631;&#20934;&#65288;ISO/IEC 9899:1990&#65289;&#65306;</li>
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<li>4.8.1.1 The va_start macro</li>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="c-variadic-va_arg.html"><span class="t-lines"><span>va_arg</span></span></a></div>
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<td>&#35775;&#38382;&#19979;&#19968;&#20010;&#20989;&#25968;&#21487;&#21464;&#21442;&#25968;<br />
<span class="t-mark">(&#23439;&#20989;&#25968;)</span></td>
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<div><a href="c-variadic-va_copy.html"><span class="t-lines"><span>va_copy</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div>
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<td>&#21019;&#36896;&#20989;&#25968;&#21487;&#21464;&#21442;&#25968;&#30340;&#21103;&#26412;<br />
<span class="t-mark">(&#23439;&#20989;&#25968;)</span></td>
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<div><a href="c-variadic-va_end.html"><span class="t-lines"><span>va_end</span></span></a></div>
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<td>&#32467;&#26463;&#20989;&#25968;&#21487;&#21464;&#21442;&#25968;&#30340;&#34892;&#31243;<br />
<span class="t-mark">(&#23439;&#20989;&#25968;)</span></td>
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<div><a href="c-variadic-va_list.html"><span class="t-lines"><span>va_list</span></span></a></div>
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<td>&#20445;&#26377; va_start &#12289; va_arg &#12289; va_end &#21450; va_copy &#25152;&#38656;&#20449;&#24687;<br />
<span class="t-mark">(typedef)</span></td>
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