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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>arg<span style="font-size:0.7em; line-height:130%">(std::complex)</span></h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-numeric.html">numeric</a>&lrm; | <a href="cpp-numeric-complex.html">complex</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-complex.html">&lt;complex&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T <span class="sy1">&gt;</span><br />
T arg<span class="br0">(</span> <span class="kw4">const</span> complex<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> z <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">double</span> arg<span class="br0">(</span> <span class="kw4">long</span> <span class="kw4">double</span> z <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> DoubleOrInteger <span class="sy1">&gt;</span><br />
<span class="kw4">double</span> arg<span class="br0">(</span> DoubleOrInteger 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-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span> arg<span class="br0">(</span> <span class="kw4">float</span> z <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<p>&#35745;&#31639;&#22797;&#25968; <code>z</code> &#30340;&#36752;&#35282;&#65288;&#20197;&#24359;&#24230;&#34920;&#31034;&#65289;</p>
<p><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span>&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">double</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">double</span></span></span> &#21450;&#25152;&#26377;&#25972;&#25968;&#31867;&#22411;&#25552;&#20379;&#37325;&#36733;&#65292;&#23427;&#20204;&#34987;&#24403;&#20570;&#26377;&#38646;&#34394;&#37096;&#30340;&#22797;&#25968;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>z</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;&#26080;&#38169;&#35823;&#21457;&#29983;&#65292;&#21017;&#36820;&#22238; <code>z</code> &#22312;&#21306;&#38388; <span class="texhtml" style="white-space: nowrap;">(&minus;&pi;; &pi;)</span> &#20869;&#30340;&#36752;&#35282;&#12290;</p>
<p>&#38169;&#35823;&#21644;&#29305;&#27530;&#24773;&#20917;&#25353;&#29031;&#20989;&#25968;&#23451;&#22914;&#20197; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-numeric-math-atan2.html"><span class="kw1339">std::<span class="me2">atan2</span></span></a><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">imag</span><span class="br0">(</span>z<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">real</span><span class="br0">(</span>z<span class="br0">)</span><span class="br0">)</span></span></span> &#23454;&#29616;&#26469;&#22788;&#29702;&#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;iostream&gt;</span>
<span class="co2">#include &lt;complex&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-numeric-complex.html"><span class="kw1472">std::<span class="me2">complex</span></span></a><span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span> z1<span class="br0">(</span><span class="nu0">1</span>, <span class="nu0">0</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;phase angle of &quot;</span> <span class="sy1">&lt;&lt;</span> z1 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; is &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">arg</span><span class="br0">(</span>z1<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<a href="cpp-numeric-complex.html"><span class="kw1472">std::<span class="me2">complex</span></span></a><span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span> z2<span class="br0">(</span><span class="nu0">0</span>, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;phase angle of &quot;</span> <span class="sy1">&lt;&lt;</span> z2 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; is &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">arg</span><span class="br0">(</span>z2<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<a href="cpp-numeric-complex.html"><span class="kw1472">std::<span class="me2">complex</span></span></a><span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span> z3<span class="br0">(</span><span class="sy2">-</span><span class="nu0">1</span>, <span class="nu0">0</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;phase angle of &quot;</span> <span class="sy1">&lt;&lt;</span> z3 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; is &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">arg</span><span class="br0">(</span>z3<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<a href="cpp-numeric-complex.html"><span class="kw1472">std::<span class="me2">complex</span></span></a><span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span> z4<span class="br0">(</span><span class="sy2">-</span><span class="nu0">1</span>, <span class="sy2">-</span><span class="nu16">0.0</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;phase angle of &quot;</span> <span class="sy1">&lt;&lt;</span> z4 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; (the other side of the cut) is &quot;</span>
<span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">arg</span><span class="br0">(</span>z4<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</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">phase angle of (1,0) is 0
phase angle of (0,1) is 1.5708
phase angle of (-1,0) is 3.14159
phase angle of (-1,-0) (the other side of the cut) is -3.14159</pre></div>
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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="cpp-numeric-complex-abs.html"><span class="t-lines"><span>abs<span class="t-dsc-small">(std::complex)</span></span></span></a></div>
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<td>&#36820;&#22238;&#22797;&#25968;&#30340;&#27169;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div><a href="cpp-numeric-complex-polar.html"><span class="t-lines"><span>polar</span></span></a></div>
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<td>&#20174;&#27169;&#21644;&#36752;&#35282;&#26500;&#36896;&#22797;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div><a href="cpp-numeric-math-atan2.html"><span class="t-lines"><span>atan2</span><span>atan2f</span><span>atan2l</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#21453;&#27491;&#20999;&#65292;&#29992;&#31526;&#21495;&#30830;&#23450;&#35937;&#38480;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div><a href="cpp-numeric-valarray-atan2.html"><span class="t-lines"><span>atan2<span class="t-dsc-small">(std::valarray)</span></span></span></a></div>
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<td>&#24212;&#29992;&#20989;&#25968; <span class="t-lc"><a href="cpp-numeric-math-atan2.html">std::atan2</a></span> &#21040;&#19968;&#20010; valarray &#21644;&#19968;&#20010;&#20540;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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