__fpclassifyd

Syntax

#include <math.h> int __fpclassifyd(double);

Description

Returns the kind of the floating point value supplied. You should use the type generic macro fpclassify (see section fpclassify) instead of this function.

Return Value

FP_INFINITE, FP_NAN, FP_NORMAL, FP_SUBNORMAL or FP_ZERO.

Portability

ANSI/ISO C

C99; not C89

Example

if( __fpclassifyd(0.0) != FP_ZERO ) { printf("Something is wrong with the implementation!\n"); }