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<a name="fmod_002c-fmodf_002d_002d_002dfloating_002dpoint-remainder-_0028modulo_0029"></a>
<h3 class="section">1.25 <code>fmod</code>, <code>fmodf</code>&mdash;floating-point remainder (modulo)</h3>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double fmod(double <var>x</var>, double <var>y</var>);
float fmodf(float <var>x</var>, float <var>y</var>);

</pre></div>
<p><strong>Description</strong><br>
The <code>fmod</code> and <code>fmodf</code> functions compute the floating-point
remainder of <var>x</var>/<var>y</var> (<var>x</var> modulo <var>y</var>).
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<p><strong>Returns</strong><br>
The <code>fmod</code> function returns the value 
<var>x</var>-<var>i</var>*<var>y</var>, 
for the largest integer <var>i</var> such that, if <var>y</var> is nonzero, the
result has the same sign as <var>x</var> and magnitude less than the
magnitude of <var>y</var>. 
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<p><code>fmod(<var>x</var>,0)</code> returns NaN, and sets <code>errno</code> to <code>EDOM</code>.
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<p><strong>Portability</strong><br>
<code>fmod</code> is ANSI C. <code>fmodf</code> is an extension.
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