Extracts exponential value of double-precision floating-point argument.
double _logb( double x );
| Routine | Required Header | Compatibility |
| _logb | <float.h> | Win 95, Win NT |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
| LIBC.LIB | Single thread static library, retail version |
| LIBCMT.LIB | Multithread static library, retail version |
| MSVCRT.LIB | Import library for MSVCRT.DLL, retail version |
Return Value
_logb returns the unbiased exponential value of x.
Parameter
x
Double-precision floating-point value
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.
Floating-Point Support Routines
See Also frexp