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<h1 id="firstHeading" class="firstHeading">cpowf, cpow, cpowl</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="c.html">c</a>&lrm; | <a href="c-numeric.html">numeric</a>&lrm; | <a href="c-numeric-complex.html">complex</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;complex.h&gt;</code></div>
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<div><span class="mw-geshi c source-c"><span class="kw4">float</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> &nbsp; &nbsp; &nbsp; cpowf<span class="br0">(</span> <span class="kw4">float</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> x, <span class="kw4">float</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> y <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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<div><span class="mw-geshi c source-c"><span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> &nbsp; &nbsp; &nbsp;cpow<span class="br0">(</span> <span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> x, <span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> y <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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<div><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> cpowl<span class="br0">(</span> <span class="kw4">long</span> <span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> x, <span class="kw4">long</span> <span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> y <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;tgmath.h&gt;</code></div>
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<div><span class="mw-geshi c source-c"><span class="co2">#define pow( x, y )</span></span></div>
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<td>(4)</td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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<div class="t-li1"><span class="t-li">1-3)</span> &#35745;&#31639;&#22797;&#24130;&#20989;&#25968; x<span class="t-su">y<br /></span> &#65292;&#39318;&#21442;&#25968;&#30340;&#20998;&#25903;&#20999;&#21106;&#27839;&#36127;&#23454;&#36724;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#27867;&#22411;&#23439;&#12290;&#33509;&#20219;&#20309;&#21442;&#25968;&#25317;&#26377; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a></span></span> &#31867;&#22411;&#65292;&#21017;&#35843;&#29992; <code>cpowl</code> &#12290;&#33509;&#20219;&#20309;&#21442;&#25968;&#25317;&#26377; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a></span></span> &#31867;&#22411;&#65292;&#21017;&#35843;&#29992; <code>cpow</code> &#65292;&#33509;&#20219;&#20309;&#21442;&#25968;&#25317;&#26377; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a></span></span> &#31867;&#22411;&#65292;&#21017;&#35843;&#29992; <code>cpowf</code> &#12290;&#33509;&#21442;&#25968;&#20026;&#23454;&#25968;&#25110;&#25972;&#25968;&#65292;&#21017;&#23439;&#35843;&#29992;&#23545;&#24212;&#30340;&#23454;&#20989;&#25968;&#65288; <span class="t-c"><span class="mw-geshi c source-c">powf</span></span> &#12289; <span class="t-c"><span class="mw-geshi c source-c"><a href="c-numeric-math-pow.html"><span class="kw668">pow</span></a></span></span> &#12289; <span class="t-c"><span class="mw-geshi c source-c">powl</span></span> &#65289; &#12290;&#33509;&#21442;&#25968;&#20026;&#34394;&#25968;&#65292;&#21017;&#35843;&#29992;&#23545;&#24212;&#30340;&#22797;&#25968;&#29256;&#26412;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>x, y</td>
<td>-</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#33509;&#19981;&#20986;&#29616;&#38169;&#35823;&#65292;&#21017;&#36820;&#22238;&#22797;&#24130; <span class="texhtml" style="white-space: nowrap;">x<span class="t-su">y<br /></span></span> &#12290;</p>
<p>&#38169;&#35823;&#21644;&#29305;&#27530;&#24773;&#20917;&#25353;&#29031;&#22914;&#21516;&#20197; <span class="t-c"><span class="mw-geshi c source-c"><a href="c-numeric-complex-cexp.html"><span class="kw769">cexp</span></a><span class="br0">(</span>y<span class="sy2">*</span><a href="c-numeric-complex-clog.html"><span class="kw772">clog</span></a><span class="br0">(</span>x<span class="br0">)</span><span class="br0">)</span></span></span> &#23454;&#29616;&#36816;&#31639;&#19968;&#33324;&#22788;&#29702;&#65292;&#38500;&#20102;&#20801;&#35768;&#23454;&#29616;&#26356;&#32454;&#33268;&#22320;&#22788;&#29702;&#29305;&#27530;&#24773;&#20917;&#12290;</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;complex.h&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> z <span class="sy1">=</span> cpow<span class="br0">(</span><span class="nu16">1.0</span><span class="sy2">+</span><span class="nu16">2.0</span><span class="sy2">*</span>I, <span class="nu0">2</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw848">printf</span></a><span class="br0">(</span><span class="st0">&quot;(1+2i)^2 = %.1f%+.1fi<span class="es1">\n</span>&quot;</span>, <a href="c-numeric-complex-creal.html"><span class="kw754">creal</span></a><span class="br0">(</span>z<span class="br0">)</span>, <a href="c-numeric-complex-cimag.html"><span class="kw751">cimag</span></a><span class="br0">(</span>z<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> z2 <span class="sy1">=</span> cpow<span class="br0">(</span><span class="sy2">-</span><span class="nu0">1</span>, <span class="nu16">0.5</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw848">printf</span></a><span class="br0">(</span><span class="st0">&quot;(-1+0i)^0.5 = %.1f%+.1fi<span class="es1">\n</span>&quot;</span>, <a href="c-numeric-complex-creal.html"><span class="kw754">creal</span></a><span class="br0">(</span>z2<span class="br0">)</span>, <a href="c-numeric-complex-cimag.html"><span class="kw751">cimag</span></a><span class="br0">(</span>z2<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> z3 <span class="sy1">=</span> cpow<span class="br0">(</span><a href="c-numeric-complex-conj.html"><span class="kw760">conj</span></a><span class="br0">(</span><span class="sy2">-</span><span class="nu0">1</span><span class="br0">)</span>, <span class="nu16">0.5</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#20999;&#21106;&#30340;&#21478;&#19968;&#20391;</span>
<a href="c-io-fprintf.html"><span class="kw848">printf</span></a><span class="br0">(</span><span class="st0">&quot;(-1-0i)^0.5 = %.1f%+.1fi<span class="es1">\n</span>&quot;</span>, <a href="c-numeric-complex-creal.html"><span class="kw754">creal</span></a><span class="br0">(</span>z3<span class="br0">)</span>, <a href="c-numeric-complex-cimag.html"><span class="kw751">cimag</span></a><span class="br0">(</span>z3<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> z4 <span class="sy1">=</span> cpow<span class="br0">(</span>I, I<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// i^i = exp(-pi/2)</span>
<a href="c-io-fprintf.html"><span class="kw848">printf</span></a><span class="br0">(</span><span class="st0">&quot;i^i = %f%+fi<span class="es1">\n</span>&quot;</span>, <a href="c-numeric-complex-creal.html"><span class="kw754">creal</span></a><span class="br0">(</span>z4<span class="br0">)</span>, <a href="c-numeric-complex-cimag.html"><span class="kw751">cimag</span></a><span class="br0">(</span>z4<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">(1+2i)^2 = -3.0+4.0i
(-1+0i)^0.5 = 0.0+1.0i
(-1-0i)^0.5 = 0.0-1.0i
i^i = 0.207880+0.000000i</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>7.3.8.2 The cpow functions (p: 195-196)</li>
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<li>7.25 Type-generic math &lt;tgmath.h&gt; (p: 373-375)</li>
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<li>G.6.4.1 The cpow functions (p: 544)</li>
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<li>G.7 Type-generic math &lt;tgmath.h&gt; (p: 545)</li>
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<div class="t-ref-std-c99">
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<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
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<li>7.3.8.2 The cpow functions (p: 177)</li>
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</dd>
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<li>7.22 Type-generic math &lt;tgmath.h&gt; (p: 335-337)</li>
</ul>
</dd>
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<li>G.6.4.1 The cpow functions (p: 479)</li>
</ul>
</dd>
</dl>
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<li>G.7 Type-generic math &lt;tgmath.h&gt; (p: 480)</li>
</ul>
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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-numeric-complex-csqrt.html"><span class="t-lines"><span>csqrt</span><span>csqrtf</span><span>csqrtl</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div>
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<td>&#35745;&#31639;&#22797;&#25968;&#24179;&#26041;&#26681;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="c-numeric-math-pow.html"><span class="t-lines"><span>pow</span><span>powf</span><span>powl</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div>
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<td>&#35745;&#31639;&#19968;&#20010;&#25968;&#30340;&#32473;&#23450;&#27425;&#24130;&#65288; <span class="mjax" style="display:none">\(\small{x^y}\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">x<sup>y</sup></span> &#65289;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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