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<h1 id="firstHeading" class="firstHeading">cprojf, cproj, cprojl</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; cprojf<span class="br0">(</span> <span class="kw4">float</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> z <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;cproj<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="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> cprojl<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> z <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 cproj( z )</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; <code>z</code> &#22312;&#40654;&#26364;&#29699;&#38754;&#19978;&#30340;&#25237;&#24433;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#27867;&#22411;&#23439;&#65306;&#33509; <code>z</code> &#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> &#12289; <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-imaginary.html"><span class="kw745">imaginary</span></a></span></span> &#25110; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> &#31867;&#22411;&#65292;&#21017;&#35843;&#29992; <code>cprojl</code> &#12290;&#33509; <code>z</code> &#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> &#12289; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span> <a href="c-numeric-complex-imaginary.html"><span class="kw745">imaginary</span></a></span></span> &#25110; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span> &#31867;&#22411;&#65292;&#21017;&#35843;&#29992; <code>cprojf</code> &#12290;&#33509; <code>z</code> &#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> &#12289; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span> <a href="c-numeric-complex-imaginary.html"><span class="kw745">imaginary</span></a></span></span> &#12289; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> &#25110;&#20219;&#20309;&#25972;&#25968;&#31867;&#22411;&#65292;&#21017;&#35843;&#29992; <code>cproj</code> &#12290;</div>
<p>&#23545;&#20110;&#32477;&#22823;&#22810;&#25968; <code>z</code> &#65292; <span class="t-c"><span class="mw-geshi c source-c">cproj<span class="br0">(</span>z<span class="br0">)</span><span class="sy1">==</span>z</span></span> &#65292;&#20294;&#25152;&#26377;&#22797;&#26080;&#31351;&#22823;&#65292;&#21363;&#20351;&#26159;&#19968;&#37096;&#20026;&#26080;&#31351;&#22823;&#32780;&#21478;&#19968;&#37096;&#20026; NaN &#32773;&#65292;&#37117;&#21464;&#20026;&#27491;&#23454;&#26080;&#31351;&#22823;&#65292; <span class="t-c"><span class="mw-geshi c source-c">INFINITY<span class="sy2">+</span><span class="nu16">0.0</span><span class="sy2">*</span>I</span></span> &#25110; <span class="t-c"><span class="mw-geshi c source-c">INFINITY<span class="sy2">-</span><span class="nu16">0.0</span><span class="sy2">*</span>I</span></span> &#12290;&#34394;&#37096;&#65288;&#38646;&#65289;&#30340;&#31526;&#21495;&#20026; <span class="t-c"><span class="mw-geshi c source-c"><a href="c-numeric-complex-cimag.html"><span class="kw751">cimag</span></a><span class="br0">(</span>z<span class="br0">)</span></span></span> &#30340;&#31526;&#21495;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>z</td>
<td>-</td>
<td>&#22797;&#21442;&#25968;</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><code>z</code> &#22312;&#40654;&#26364;&#29699;&#38754;&#19978;&#30340;&#25237;&#24433;&#12290;</p>
<p>&#27492;&#20989;&#25968;&#20026;&#25152;&#26377;&#21487;&#34892;&#36755;&#20837;&#23436;&#25972;&#25351;&#23450;&#65292;&#24182;&#19988;&#19981;&#21463;&#21046;&#20110;&#20219;&#20309;&#25551;&#36848;&#20110; <a href="c-numeric-math-math_errhandling.html"><tt>math_errhandling</tt></a> &#30340;&#38169;&#35823;&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p><code>cproj</code> &#20989;&#25968;&#36890;&#36807;&#23558;&#25152;&#26377;&#26080;&#31351;&#22823;&#26144;&#23556;&#21040;&#19968;&#65288;&#32473;&#20986;&#25110;&#37319;&#29992;&#34394;&#37096;&#38646;&#30340;&#31526;&#21495;&#65289;&#65292;&#24110;&#21161;&#29992;&#25143;&#27169;&#25311;&#40654;&#26364;&#29699;&#38754;&#65292;&#32780;&#19988;&#23427;&#24212;&#35813;&#22312;&#20219;&#20309;&#25805;&#20316;&#65292;&#29305;&#21035;&#26159;&#27604;&#36739;&#20043;&#21069;&#20351;&#29992;&#65292;&#27604;&#36739;&#21487;&#33021;&#23545;&#20219;&#20309;&#20854;&#20182;&#26080;&#31351;&#22823;&#32473;&#20986;&#34394;&#20551;&#32467;&#26524;&#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="co2">#include &lt;math.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> z1 <span class="sy1">=</span> cproj<span class="br0">(</span><span class="nu0">1</span> <span class="sy2">+</span> <span class="nu0">2</span><span class="sy2">*</span>I<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;cproj(1+2i) = %.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>z1<span class="br0">)</span>,<a href="c-numeric-complex-cimag.html"><span class="kw751">cimag</span></a><span class="br0">(</span>z1<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> cproj<span class="br0">(</span>INFINITY<span class="sy2">+</span><span class="nu16">2.0</span><span class="sy2">*</span>I<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;cproj(Inf+2i) = %.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> cproj<span class="br0">(</span>INFINITY<span class="sy2">-</span><span class="nu16">2.0</span><span class="sy2">*</span>I<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;cproj(Inf-2i) = %.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="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">cproj(1+2i) = 1.0+2.0i
cproj(Inf+2i) = inf+0.0i
cproj(Inf-2i) = inf-0.0i</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>
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<dd>
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<li>7.3.9.5 The cproj functions (p: 198)</li>
</ul>
</dd>
</dl>
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<li>7.25 Type-generic math &lt;tgmath.h&gt; (p: 373-375)</li>
</ul>
</dd>
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<li>G.7 Type-generic math &lt;tgmath.h&gt; (p: 545)</li>
</ul>
</dd>
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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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<dd>
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<li>7.3.9.4 The cproj functions (p: 179)</li>
</ul>
</dd>
</dl>
<dl>
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<li>7.22 Type-generic math &lt;tgmath.h&gt; (p: 335-337)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
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<li>G.7 Type-generic math &lt;tgmath.h&gt; (p: 480)</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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