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_logb

Extracts an exponential value of a double-precision floating-point argument.

double _logb( 
   double x  
);

x

Double-precision floating-point value.

_logb returns the unbiased exponential value of x.

The _logb function extracts the exponential value of its double-precision floating-point argument x, as though x were represented with infinite range. If the argument x is denormalized, it is treated as if it were normalized.

Input

SEH exception

Matherr exception

± QNAN,IND

None

_DOMAIN

± 0

ZERODIVIDE

_SING

Routine

Required header

_logb

<float.h>

For more compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

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