_logb
Extracts an exponential value of a double-precision floating-point argument.
double _logb( double x );
Parameters
- x
-
Double-precision floating-point value.
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 | Compatibility |
|---|---|---|
| _logb | <float.h> | ANSI, Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 |
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.
