Difference between revisions of "cpp/numeric/math/log2"
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| − | Computes the base {{ | + | Computes the base {{c|2}} logarithm of {{c|arg}}. |
===Parameters=== | ===Parameters=== | ||
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| − | Domain error occurs if {{tt|arg}} is negative. {{ | + | Domain error occurs if {{tt|arg}} is negative. {{c|NAN}} is returned in that case. |
| − | Range error occurs if {{tt|arg}} is {{ | + | Range error occurs if {{tt|arg}} is {{c|0}}. {{c|-HUGE_VAL}} is returned in that case. |
===See also=== | ===See also=== | ||
Revision as of 16:03, 19 April 2012
Template:cpp/numeric/math/sidebar Template:ddcl list begin <tr class="t-dsc-header">
<td>Defined in header
</td>
<cmath>
<td></td> <td></td> </tr> <tr class="t-dcl ">
<td >float log2( float arg );
</td>
<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">
<td >double log2( double arg );
</td>
<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">
<td >long double log2( long double arg );
</td>
<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">
<td >double log2( Integral arg );
</td>
<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end
Computes the base 2 logarithm of arg.
Parameters
| arg | - | floating point value |
Return value
log2(arg)
Domain error occurs if arg is negative. NAN is returned in that case.
Range error occurs if arg is 0. -HUGE_VAL is returned in that case.
