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<a name="modf_002c-modff_002d_002d_002dsplit-fractional-and-integer-parts"></a>
<h3 class="section">1.41 <code>modf</code>, <code>modff</code>&mdash;split fractional and integer parts</h3>
<a name="index-modf"></a>
<a name="index-modff"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double modf(double <var>val</var>, double *<var>ipart</var>);
float modff(float <var>val</var>, float *<var>ipart</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>modf</code> splits the double <var>val</var> apart into an integer part
and a fractional part, returning the fractional part and
storing the integer part in <code>*<var>ipart</var></code>.  No rounding
whatsoever is done; the sum of the integer and fractional
parts is guaranteed to be exactly  equal to <var>val</var>.   That
is, if <var>realpart</var> = modf(<var>val</var>, &amp;<var>intpart</var>); then
&lsquo;<code><var>realpart</var>+<var>intpart</var></code>&rsquo; is the same as <var>val</var>.
<code>modff</code> is identical, save that it takes and returns
<code>float</code> rather than <code>double</code> values. 
</p>
<br>
<p><strong>Returns</strong><br>
The fractional part is returned.  Each result has the same
sign as the supplied argument <var>val</var>.
</p>
<br>
<p><strong>Portability</strong><br>
<code>modf</code> is ANSI C. <code>modff</code> is an extension.
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