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Next: <a href="log.html#log" accesskey="n" rel="next">log</a>, Previous: <a href="fpclassify.html#fpclassify" accesskey="p" rel="prev">fpclassify</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="ldexp_002c-ldexpf_002d_002d_002dload-exponent"></a>
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<h3 class="section">1.33 <code>ldexp</code>, <code>ldexpf</code>—load exponent</h3>
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<a name="index-ldexp"></a>
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<a name="index-ldexpf"></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 ldexp(double <var>val</var>, int <var>exp</var>);
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float ldexpf(float <var>val</var>, int <var>exp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>ldexp</code> calculates the value
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<var>val</var> times 2 to the power <var>exp</var>.
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<code>ldexpf</code> is identical, save that it takes and returns <code>float</code>
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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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<code>ldexp</code> returns the calculated value.
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</p>
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<p>Underflow and overflow both set <code>errno</code> to <code>ERANGE</code>.
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On underflow, <code>ldexp</code> and <code>ldexpf</code> return 0.0.
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On overflow, <code>ldexp</code> returns plus or minus <code>HUGE_VAL</code>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>ldexp</code> is ANSI. <code>ldexpf</code> is an extension.
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