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<a name="fabs_002c-fabsf_002d_002d_002dabsolute-value-_0028magnitude_0029"></a>
<h3 class="section">1.19 <code>fabs</code>, <code>fabsf</code>&mdash;absolute value (magnitude)</h3>
<a name="index-fabs"></a>
<a name="index-fabsf"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double fabs(double <var>x</var>);
float fabsf(float <var>x</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>fabs</code> and <code>fabsf</code> calculate 
the absolute value (magnitude) of the argument <var>x</var>, by direct
manipulation of the bit representation of <var>x</var>.
</p>
<br>
<p><strong>Returns</strong><br>
The calculated value is returned.  No errors are detected.
</p>
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<p><strong>Portability</strong><br>
<code>fabs</code> is ANSI.
<code>fabsf</code> is an extension.
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