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_fpclass

Returns status word containing information on floating-point class.

int _fpclass( 
   double x 
);

Parameter

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 may have one of the following values, defined in FLOAT.H.

Value Meaning
_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 Compatibility
_fpclass <float.h> Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

See Also

Floating-Point Support Routines | _isnan | Run-Time Routines and .NET Framework Equivalents

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