#include <math.h>
#include <stdio.h>                  /* for printf */
void tst_pow (void) {
   float base;
   float power;
   float y;
   base = 2.0;
   power = 8.0;
   y = pow (base, power); /* y = 256 */
   printf ("%f ^ %f = %f\n", base, power, y);
}