133 lines
4.7 KiB
HTML
133 lines
4.7 KiB
HTML
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<head>
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<title>The GNU Fortran Compiler: POPCNT</title>
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Intrinsic-Procedures.html#Intrinsic-Procedures" rel="up" title="Intrinsic Procedures">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="POPCNT"></a>
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<div class="header">
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<p>
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Next: <a href="POPPAR.html#POPPAR" accesskey="n" rel="next">POPPAR</a>, Previous: <a href="PERROR.html#PERROR" accesskey="p" rel="prev">PERROR</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="POPCNT-_002d_002d_002d-Number-of-bits-set"></a>
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<h3 class="section">9.207 <code>POPCNT</code> — Number of bits set</h3>
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<a name="index-POPCNT"></a>
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<a name="index-binary-representation"></a>
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<a name="index-bits-set"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>POPCNT(I)</code> returns the number of bits set (’1’ bits) in the binary
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representation of <code>I</code>.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>Fortran 2008 and later
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Elemental function
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>RESULT = POPCNT(I)</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>I</var></td><td width="70%">Shall be of type <code>INTEGER</code>.</td></tr>
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</table>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd><p>The return value is of type <code>INTEGER</code> and of the default integer
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kind.
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</p>
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</dd>
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<dt><em>See also</em>:</dt>
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<dd><p><a href="POPPAR.html#POPPAR">POPPAR</a>, <a href="LEADZ.html#LEADZ">LEADZ</a>, <a href="TRAILZ.html#TRAILZ">TRAILZ</a>
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</p>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">program test_population
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print *, popcnt(127), poppar(127)
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print *, popcnt(huge(0_4)), poppar(huge(0_4))
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print *, popcnt(huge(0_8)), poppar(huge(0_8))
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end program test_population
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</pre></div>
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</dd>
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</dl>
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