#include <stdio.h>
void prod_sum(double x, double y,
                double *ptr1, double *ptr2);

int main()
{
  double var1 = 3.0, var2 = 5.0;
  double prod, sum;
    
  prod_sum(var1, var2, &prod, &sum);
    
    printf("var1= %g\n"
         "var2= %g\n",var1, var2);
  printf("prod= %g\n" "sum= %g\n", prod, sum);
}

/* function definition */ 
void prod_sum(double A, double B, double *prod, double *sum)
 {
   *prod = A * B;
   *sum = A + B;
 }