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_fpclass

Visual Studio 6.0

Returns status word containing information on floating-point class.

int _fpclass( double

x );

Function Required Header Compatibility
_fpclass <float.h> Win 95, Win NT

For additional compatibility information, see Compatibility in the Introduction.

Libraries

LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version

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)

Parameter

x

Double-precision floating-point value

Floating-Point Support Routines

See Also   _isnan

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