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log2

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Template:ddcl list begin <tr class="t-dsc-header">

<td>
Defined in header <math.h>
</td>

<td></td> <td></td> <tr class="t-dcl ">

<td >
float       log2f( float arg );
</td>

<td class="t-dcl-nopad"> </td> <td > (since C99) </td> </tr> <tr class="t-dcl ">

<td >
double      log2( double arg );
</td>

<td class="t-dcl-nopad"> </td> <td > (since C99) </td> </tr> <tr class="t-dcl ">

<td >
long double log2l( long double arg );
</td>

<td class="t-dcl-nopad"> </td> <td > (since C99) </td> </tr> Template:ddcl list end

Computes the base 2 logarithm of arg.

Parameters

arg - floating point value

Return value

log
2
(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.

See also

Template:c/numeric/math/dcl list logTemplate:c/numeric/math/dcl list log10