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klarkxy 196e706fe4 上传cppreference
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<p>&#21464;&#21442;&#25968;&#20989;&#25968;&#26159;&#20351;&#29992;&#21487;&#21464;&#25968;&#37327;&#21442;&#25968;&#30340;&#20989;&#25968;&#65288;&#20363;&#22914; <span class="t-lc"><a href="c-io-fprintf.html">printf</a></span> &#65289;&#12290;</p>
<p>&#21464;&#21442;&#25968;&#20989;&#25968;&#20351;&#29992;&#22312;&#20854;&#26368;&#21518;&#19968;&#20010;&#21442;&#25968;&#21518;&#21152;&#30465;&#30053;&#21495;&#22768;&#26126;&#65292;&#20363;&#22914; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">int</span> <a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> format, ...<span class="br0">)</span><span class="sy4">;</span></span></span> &#12290;&#35821;&#27861;&#21644;&#33258;&#21160;&#21442;&#25968;&#36716;&#25442;&#30340;&#39069;&#22806;&#32454;&#33410;&#35265;<a href="c-language-variadic.html">&#21487;&#21464;&#21442;&#25968;</a>&#12290;</p>
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<h5><span class="mw-headline" id=".E5.AE.8F">&#23439;</span></h5>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;stdarg.h&gt;</code></div>
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<div><a href="c-variadic-va_start.html"><span class="t-lines"><span>va_start</span></span></a></div>
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<td>&#20196;&#20989;&#25968;&#24471;&#20197;&#35775;&#38382;&#21487;&#21464;&#21442;&#25968;<br />
<span class="t-mark">(&#23439;&#20989;&#25968;)</span></td>
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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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<h5><span class="mw-headline" id=".E7.B1.BB.E5.9E.8B">&#31867;&#22411;</span></h5>
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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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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<p>&#25171;&#21360;&#19981;&#21516;&#31867;&#22411;&#30340;&#20540;&#12290;</p>
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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">void</span> simple_printf<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> fmt, ...<span class="br0">)</span>
<span class="br0">{</span>
va_list args<span class="sy4">;</span>
va_start<span class="br0">(</span>args, fmt<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">while</span> <span class="br0">(</span><span class="sy2">*</span>fmt <span class="sy3">!</span><span class="sy1">=</span> <span class="st0">&#39;<span class="es5">\0</span>&#39;</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">if</span> <span class="br0">(</span><span class="sy2">*</span>fmt <span class="sy1">==</span> <span class="st0">&#39;d&#39;</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw4">int</span> i <span class="sy1">=</span> va_arg<span class="br0">(</span>args, <span class="kw4">int</span><span class="br0">)</span><span class="sy4">;</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>, i<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span> <span class="kw1">else</span> <span class="kw1">if</span> <span class="br0">(</span><span class="sy2">*</span>fmt <span class="sy1">==</span> <span class="st0">&#39;c&#39;</span><span class="br0">)</span> <span class="br0">{</span>
<span class="co1">// &#23558;&#25552;&#21319; &#39;char&#39; &#31867;&#22411;&#20540;&#20026; &#39;int&#39;</span>
<span class="co1">// C &#20013;&#23383;&#31526;&#24120;&#37327;&#33258;&#36523;&#20026; &#39;int&#39; &#31867;&#22411;</span>
<span class="kw4">int</span> c <span class="sy1">=</span> va_arg<span class="br0">(</span>args, <span class="kw4">int</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">&quot;%c<span class="es1">\n</span>&quot;</span>, c<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span> <span class="kw1">else</span> <span class="kw1">if</span> <span class="br0">(</span><span class="sy2">*</span>fmt <span class="sy1">==</span> <span class="st0">&#39;f&#39;</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw4">double</span> d <span class="sy1">=</span> va_arg<span class="br0">(</span>args, <span class="kw4">double</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">&quot;%f<span class="es1">\n</span>&quot;</span>, d<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="sy2">++</span>fmt<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="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>
simple_printf<span class="br0">(</span><span class="st0">&quot;dcff&quot;</span>, <span class="nu0">3</span>, <span class="st0">&#39;a&#39;</span>, <span class="nu16">1.999</span>, <span class="nu16">42.5</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">3
a
1.999000
42.50000</pre></div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
<div class="t-ref-std-11">
<ul>
<li>C11 &#26631;&#20934;&#65288;ISO/IEC 9899:2011&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.16 Variable arguments &lt;stdarg.h&gt; (p: 269-272)</li>
</ul>
</dd>
</dl>
<div class="t-ref-std-c99">
<ul>
<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.15 Variable arguments &lt;stdarg.h&gt; (p: 249-252)</li>
</ul>
</dd>
</dl>
<div class="t-ref-std-c89">
<ul>
<li>C89/C90 &#26631;&#20934;&#65288;ISO/IEC 9899:1990&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>4.8 VARIABLE ARGUMENTS &lt;stdarg.h&gt;</li>
</ul>
</dd>
</dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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