fpclassify(fpval) : fpclassify « math.h « C Tutorial

1. C Tutorial
2. math.h
3. fpclassify

int fpclassify(fpval)

Returns

1. FP_INFINITE,
2. FP_NAN,
3. FP_NORMAL,
4. FP_SUBNORMAL, or
5. FP_ZERO,

depending upon the value in fpval. These macros are defined by .

#include <stdio.h>
#include <math.h>

int main(void)
{
  printf("fpclassify(-1.0) %d\n", fpclassify(-1.0));
  printf("fpclassify(1.0) %d\n", fpclassify(1.0));
  printf("fpclassify(1.0/0.0) %d\n", fpclassify(1.0/0.0));
  return 0;
}

fpclassify(-1.0) 1024
fpclassify(1.0) 1024
fpclassify(1.0/0.0) 1280