int main()
{
Sales_data total;
double totalPrice;
if( cin >> total.bookNo >> total.units_sold >> totalPrice ){
Sales_data trans;
double transPrice;
total.CalcRevenue(totalPrice);
while( 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{
