int main () {
/* variable definition: */
   int count;
   double avg, value, weight, sum, sumw;
/* Initialize */
   count = 0;
   sum = 0;
   sumw = 0;
   avg = 0.0;
// Loop through to input values
   while (count < 5) {
      printf("Enter a value and its weight: ");
      // use %lf for double, %f for float
      scanf("%lf %lf", &value, &weight);
      if (weight >= 0) {
         sumw = sumw + weight;
         sum = sum + value * weight;
         count = count + 1;
      }
      else {
         printf("Weight must be positive\n");
      } // end if weight ok
   } // end reading input values and weights
// Calculate avg if sumw is not 0
   avg = sum / sumw;
   printf("average is %lf\n " , avg );
   return 0;
} // end main

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