ex2_42_3.cpp

#include <iostream>
#include "ex2_42.h"

int main()
{
    Sales_data total;
    double totalPrice;
    if (std::cin >> total.bookNo >> total.units_sold >> totalPrice)
    {
        total.CalcRevenue(totalPrice);
        Sales_data trans;
        double transPrice;
        while (std::cin >> trans.bookNo >> trans.units_sold >> transPrice)
        {
            trans.CalcRevenue(transPrice);
            if (total.bookNo == trans.bookNo)
            {
                total.AddData(trans);
            }
            else
            {
                total.Print();
                total.SetData(trans);
            }
        }
        total.Print();
        return 0;
    }
    else
    {
        std::cerr << "No data?!" << std::endl;
        return -1;  // indicate failure
    }
}