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Extracts an exponential value of a double-precision floating-point argument.
double _logb(
double x
);
Parameters
- x
Double-precision floating-point value.
Return Value
_logb returns the unbiased exponential value of x.
Remarks
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 |
Requirements
Routine |
Required header |
|---|---|
_logb |
<float.h> |
For more compatibility information, see Compatibility in the Introduction.
Libraries
All versions of the C run-time libraries.
.NET Framework Equivalent
Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.