#include <iostream>

int main()
{
    // define number of scores
    const int NSCORES = 6 ;

    // variables to hold the total weighted score and the total weight
    double total_weighted_score = 0 ;
    double total_weight = 0 ;

    // accept 'NSCORES' score-weight pairs from the user,
    // accumulate the total weighted score and the total weight  as you go
    int score ;
    double weight ;
    for( int i = 0 ; i < NSCORES ; ++i )
    {
        std::cout << "enter score and weight: " ;
        std::cin >> score >> weight ;
        // TO DO: validate that score and weight are within valid ranges
        //              if not, emit a message, and repeat the above two lines

        const double weighted_score = score * weight ;
        total_weighted_score += weighted_score ;
        total_weight += weight ;
    }

    // TO DO: calculate weighted average (total_weighted_score divided by total_weight)
    //             and print it out
}