_fpclass
Returns the status word containing information about the floating-point class.
int _fpclass(
double x
);
Параметры
- x
Double-precision floating-point value.
Возвращаемое значение
_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) |
Требования
Function |
Required header |
|---|---|
_fpclass |
<float.h> |
For more compatibility information, see Compatibility in the Introduction.