تابع ‎islessgreater()‎‎ در ‎C++‎

/* islessgreater example */
#include <stdio.h>/* printf */
#include <math.h>/* islessgreater, log */

int main ()
{
double result;
result = log (10.0);
if (islessgreater(result,0.0))
printf ("log(10.0) is not zero");
else
printf ("log(10.0) is zero");
return 0;
}