exercise2_42_2.cpp

#include <iostream>
#include "exercise2_42.h"

int main()
{
	Sales_data book1, book2;
	double price1, price2;
	std::cin >> book1.bookNo >> book1.units_sold >> price1;
	std::cin >> book2.bookNo >> book2.units_sold >> price2;
	book1.CalcRevenue(price1);
	book2.CalcRevenue(price2);

	if (book1.bookNo == book2.bookNo)
	{
		book1.AddData(book2);
		book1.Print();
		return 0;
	}
	else
	{
		std::cerr << "Data must refer to same ISBN" << std::endl;
		return -1;  
	}
}