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<a name="csqrt_002c-csqrtf_002d_002d_002dcomplex-square-root"></a>
<h3 class="section">2.21 <code>csqrt</code>, <code>csqrtf</code>&mdash;complex square root</h3>
<a name="index-csqrt"></a>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;complex.h&gt;
double complex csqrt(double complex <var>z</var>);
float complex csqrtf(float complex <var>z</var>);

</pre></div>
<p><strong>Description</strong><br>
These functions compute the complex square root of <var>z</var>, with 
a branch cut along the negative real axis. 
</p>
<p><code>csqrtf</code> is identical to <code>csqrt</code>, except that it performs
its calculations on <code>floats complex</code>.
</p>
<br>
<p><strong>Returns</strong><br>
The csqrt functions return the complex square root value, in 
the range of the right halfplane (including the imaginary axis).
</p>
<br>
<p><strong>Portability</strong><br>
<code>csqrt</code> and <code>csqrtf</code> are ISO C99
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