isfinite Macro

Returns true if its argument is finite.

Include

<math.h>

Prototype

int isfinite(floating-point x);

Argument

x

any floating-point number

Return Value

Returns true if its argument is finite, i.e. is not infinite or NaN.

Example

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

int main(void)
{
  double x;
  int b;

  x = 0.0;
  b = isfinite(x);
  printf("The value %f is %sconsidered finite\n", x, b ? "" : "not ");
}

Example Output

The value 0.000000 is considered finite