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Next: <a href="nan.html#nan" accesskey="n" rel="next">nan</a>, Previous: <a href="lround.html#lround" accesskey="p" rel="prev">lround</a>, Up: <a href="Math.html#Math" accesskey="u" rel="up">Math</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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<a name="modf_002c-modff_002d_002d_002dsplit-fractional-and-integer-parts"></a>
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<h3 class="section">1.41 <code>modf</code>, <code>modff</code>—split fractional and integer parts</h3>
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<a name="index-modf"></a>
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<a name="index-modff"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <math.h>
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double modf(double <var>val</var>, double *<var>ipart</var>);
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float modff(float <var>val</var>, float *<var>ipart</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>modf</code> splits the double <var>val</var> apart into an integer part
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and a fractional part, returning the fractional part and
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storing the integer part in <code>*<var>ipart</var></code>. No rounding
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whatsoever is done; the sum of the integer and fractional
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parts is guaranteed to be exactly equal to <var>val</var>. That
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is, if <var>realpart</var> = modf(<var>val</var>, &<var>intpart</var>); then
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‘<code><var>realpart</var>+<var>intpart</var></code>’ is the same as <var>val</var>.
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<code>modff</code> is identical, save that it takes and returns
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<code>float</code> rather than <code>double</code> values.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The fractional part is returned. Each result has the same
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sign as the supplied argument <var>val</var>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>modf</code> is ANSI C. <code>modff</code> is an extension.
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