C Tutorial/math.h/fpclassify
fpclassify(fpval)
int fpclassify(fpval)
Returns
- FP_INFINITE,
- FP_NAN,
- FP_NORMAL,
- FP_SUBNORMAL, or
- FP_ZERO,
depending upon the value in fpval. These macros are defined by <math.h>.
#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
