_fpclass

Returns the status word containing information about the floating-point class.

int _fpclass( 
   double x 
);

Parameters

x
Double-precision floating-point value.

Return 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)

Requirements

Function	Required header
_fpclass	<float.h>

For more compatibility information, see Compatibility in the Introduction.

.NET Framework Equivalent

System::Double::IsInfinity
System::Double::IsNegativeInfinity
System::Double::IsPositiveInfinity
System::Double::IsNan

_fpclass

Parameters

Return Value

Requirements

.NET Framework Equivalent

See Also

Reference

Zusätzliche Ressourcen