// Program to calculate weighted average
#include<iostream.h>
void main(void)
{
   int   N = 3;
   float weights[N];
   float sum_weights;
   float grades[N];
   float sum;
   float average;
   int   i;

   cout << "Please input 3 grades: ";
   for(i = 1; i<=N; i++){
      cin >> grades[i];
	  }

   cout << "Please input 3 weights: ";
   for (i = 1; i<=N; i++){
      cin >> weights[i];
	  }

   sum = 0;
   sum_weights = 0;
   for(i = 1; i <=N; i++){
      sum += grades[i]*weights[i];
	  sum_weights += weights[i];
	  }

   average = sum/sum_weights;
   cout << "Weighted average is " << average << endl;

   cin.get();
}