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<h1 id="firstHeading" class="firstHeading">_Complex_I</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="co2">#define _Complex_I /* unspecified */</span></span></div>
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<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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<p><code>_Complex_I</code> &#23439;&#23637;&#24320;&#25104;&#31867;&#22411; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">const</span> <span class="kw4">float</span> _Complex</span></span> &#30340;&#20540;&#65292;&#20854;&#20540;&#20026;&#34394;&#25968;&#21333;&#20301;&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">&#27880;&#24847;</span></h3>
<p>&#21487;&#22312; <span class="t-lc">I</span> &#38750;&#27861;&#26102;&#65292;&#35692;&#22914;&#31243;&#24207;&#24050;&#21462;&#28040;&#23450;&#20041;&#23427;&#26102;&#20351;&#29992;&#27492;&#23439;&#12290;</p>
<p>&#19981;&#21516;&#20110; <span class="t-lc"><a href="c-numeric-complex-Imaginary_I.html">_Imaginary_I</a></span> &#21450; <span class="t-lc"><a href="c-numeric-complex-CMPLX.html">CMPLX</a></span> &#19981;&#21516;&#65292;&#29992;&#27492;&#23439;&#26500;&#36896;&#22797;&#25968;&#20250;&#22833;&#21435;&#34394;&#25968;&#32452;&#20998;&#30340;&#38646;&#30340;&#31526;&#21495;&#20301;&#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">#undef I</span>
<span class="co2">#define J _Complex_I // &#21487;&#29992;&#20110;&#37325;&#23450;&#20041; I</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="co1">// &#21487;&#29992;&#20110;&#26500;&#24314;&#22797;&#25968;</span>
<span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> z <span class="sy1">=</span> <span class="nu16">1.0</span> <span class="sy2">+</span> <span class="nu16">2.0</span> <span class="sy2">*</span> _Complex_I<span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;1.0 + 2.0 * _Complex_I = %.1f%+.1fi<span class="es1">\n</span>&quot;</span>, <a href="c-numeric-complex-creal.html"><span class="kw753">creal</span></a><span class="br0">(</span>z<span class="br0">)</span>, <a href="c-numeric-complex-cimag.html"><span class="kw750">cimag</span></a><span class="br0">(</span>z<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#38646;&#30340;&#31526;&#21495;&#19981;&#20250;&#34987;&#20445;&#30041;</span>
<span class="kw4">double</span> <a href="c-numeric-complex-complex.html"><span class="kw743">complex</span></a> z2 <span class="sy1">=</span> <span class="nu16">0.0</span> <span class="sy2">+</span> <span class="sy2">-</span><span class="nu16">0.0</span> <span class="sy2">*</span> _Complex_I<span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;0.0 + -0.0 * _Complex_I = %.1f%+.1fi<span class="es1">\n</span>&quot;</span>, <a href="c-numeric-complex-creal.html"><span class="kw753">creal</span></a><span class="br0">(</span>z2<span class="br0">)</span>, <a href="c-numeric-complex-cimag.html"><span class="kw750">cimag</span></a><span class="br0">(</span>z2<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">1.0 + 2.0 * _Complex_I = 1.0+2.0i
0.0 + -0.0 * _Complex_I = 0.0+0.0i</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>7.3.1/4 _Complex_I (p: 188)</li>
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<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
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<li>7.3.1/2 _Complex_I (p: 170)</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-numeric-complex-Imaginary_I.html"><span class="t-lines"><span>_Imaginary_I</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>&#34394;&#25968;&#21333;&#20301;&#24120;&#37327; i<br />
<span class="t-mark">(&#23439;&#24120;&#37327;)</span></td>
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<div><a href="c-numeric-complex-I.html"><span class="t-lines"><span>I</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>&#22797;&#25968;&#25110;&#34394;&#25968;&#21333;&#20301;&#24120;&#37327; i<br />
<span class="t-mark">(&#23439;&#24120;&#37327;)</span></td>
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