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99 lines
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99 lines
3.8 KiB
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<a name="scalbn"></a>
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<p>
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Next: <a href="signbit.html#signbit" accesskey="n" rel="next">signbit</a>, Previous: <a href="round.html#round" accesskey="p" rel="prev">round</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="scalbn_002c-scalbnf_002c-scalbln_002c-scalblnf_002d_002d_002dscale-by-power-of-FLT_005fRADIX-_0028_003d2_0029"></a>
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<h3 class="section">1.51 <code>scalbn</code>, <code>scalbnf</code>, <code>scalbln</code>, <code>scalblnf</code>—scale by power of FLT_RADIX (=2)</h3>
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<a name="index-scalbn"></a>
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<a name="index-scalbnf"></a>
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<a name="index-scalbln"></a>
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<a name="index-scalblnf"></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 scalbn(double <var>x</var>, int <var>n</var>);
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float scalbnf(float <var>x</var>, int <var>n</var>);
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double scalbln(double <var>x</var>, long int <var>n</var>);
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float scalblnf(float <var>x</var>, long int <var>n</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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The <code>scalbn</code> and <code>scalbln</code> functions compute
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<var>x</var> times FLT_RADIX to the power <var>n</var>.
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efficiently. The result is computed by manipulating the exponent, rather than
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by actually performing an exponentiation or multiplication. In this
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floating-point implementation FLT_RADIX=2, which makes the <code>scalbn</code>
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functions equivalent to the <code>ldexp</code> functions.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<var>x</var> times 2 to the power <var>n</var>. A range error may occur.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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ANSI C, POSIX
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</p>
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<br>
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<p><strong>See Also</strong><br>
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<code>ldexp</code>
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</p>
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<br>
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