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| <title>The GNU Fortran Compiler: POPPAR</title> |
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| <a name="POPPAR-_002d_002d_002d-Parity-of-the-number-of-bits-set"></a> |
| <h3 class="section">9.207 <code>POPPAR</code> — Parity of the number of bits set</h3> |
| <a name="index-POPPAR"></a> |
| <a name="index-binary-representation-1"></a> |
| <a name="index-parity"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>POPPAR(I)</code> returns parity of the integer <code>I</code>, i.e. the parity |
| of the number of bits set (’1’ bits) in the binary representation of |
| <code>I</code>. It is equal to 0 if <code>I</code> has an even number of bits set, |
| and 1 for an odd number of ’1’ bits. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 2008 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Elemental function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = POPPAR(I)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>I</var></td><td width="70%">Shall be of type <code>INTEGER</code>.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The return value is of type <code>INTEGER</code> and of the default integer |
| kind. |
| </p> |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="POPCNT.html#POPCNT">POPCNT</a>, <a href="LEADZ.html#LEADZ">LEADZ</a>, <a href="TRAILZ.html#TRAILZ">TRAILZ</a> |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_population |
| print *, popcnt(127), poppar(127) |
| print *, popcnt(huge(0_4)), poppar(huge(0_4)) |
| print *, popcnt(huge(0_8)), poppar(huge(0_8)) |
| end program test_population |
| </pre></div> |
| </dd> |
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