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

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C Tutorial » math.h » fpclassify 
19.26.1.fpclassify(fpval)

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
19.26.fpclassify
19.26.1.fpclassify(fpval)
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