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fpclassify

Syntax

 
#include <math.h>

Description

The macro fpclassify returns the kind of the floating point value supplied.

Return Value

FP_INFINITE, FP_NAN, FP_NORMAL, FP_SUBNORMAL, FP_ZERO or FP_UNNORMAL.

Portability

ANSI/ISO C C99; not C89

Example

 
float f = 1;
double d = INFINITY;
long double ld = NAN;

if( fpclassify(f) != FP_NORMAL )
{
  printf("Something is wrong with the implementation!\n");
}
if( fpclassify(d) != FP_INFINITE )
{
  printf("Something is wrong with the implementation!\n");
}
if( fpclassify(ld) != FP_NAN )
{
  printf("Something is wrong with the implementation!\n");
}


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  Copyright 2004   by DJ Delorie     Updated Apr 2004