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_fpclass

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

int _fpclass( 
   double x 
);

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

_fpclass

<float.h>

For more compatibility information, see Compatibility in the Introduction.

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