isnormal Macro

Returns true if its argument is normal.

Include

<math.h>

Prototype

int isnormal(floating-point x);

Argument

x

any floating-point number

Return Value

Returns true if its argument is normal, i.e. it is not NaN, infinite, subnormal, nor zero; it returns zero otherwise.

Example

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

int main(void)
{
  double x, y, z;

  x = 5.0;
  y = 2.0;
  z = x / y;
  if(isnormal(z))
    printf("The division of %f by %f is normal\n", x, y);
}

Example Output

The division of 5.000000 by 2.000000 is normal