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<a name="sqrt_002c-sqrtf_002d_002d_002dpositive-square-root"></a>
<h3 class="section">1.55 <code>sqrt</code>, <code>sqrtf</code>&mdash;positive square root</h3>
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<p><strong>Synopsis</strong>
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<pre class="example">#include &lt;math.h&gt;
double sqrt(double <var>x</var>);
float  sqrtf(float <var>x</var>);

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<p><strong>Description</strong><br>
<code>sqrt</code> computes the positive square root of the argument.
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<p><strong>Returns</strong><br>
On success, the square root is returned. If <var>x</var> is real and
positive, then the result is positive.  If <var>x</var> is real and
negative, the global value <code>errno</code> is set to <code>EDOM</code> (domain error).
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<p><strong>Portability</strong><br>
<code>sqrt</code> is ANSI C.  <code>sqrtf</code> is an extension.
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