_fpclass
Returns the status word containing information about the floating-point class.
int _fpclass( double x );
Parameters
- x
-
Double-precision floating-point value.
_fpclass returns an integer value that indicates the floating-point class of its argument x. The status word might have one of the following values, defined in Float.h.
| Value | Description |
|---|---|
| _FPCLASS_SNAN | Signaling NaN |
| _FPCLASS_QNAN | Quiet NaN |
| _FPCLASS_NINF | Negative infinity ( –INF) |
| _FPCLASS_NN | Negative normalized non-zero |
| _FPCLASS_ND | Negative denormalized |
| _FPCLASS_NZ | Negative zero ( – 0) |
| _FPCLASS_PZ | Positive 0 (+0) |
| _FPCLASS_PD | Positive denormalized |
| _FPCLASS_PN | Positive normalized non-zero |
| _FPCLASS_PINF | Positive infinity (+INF) |
| Function | Required header | Compatibility |
|---|---|---|
| _fpclass | <float.h> | Windows 95, Windows 98, Windows 98 Second 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.
