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#ifndef SALES_DATA_H
#define SALES_DATA_H
#include <string>
struct SalesData {
std::string isbn() const { return BookNo; }
SalesData &combine(const SalesData);
double avg_price() const;
std::string BookNo;
unsigned int UnitsSold = 0;
double Revenue = 0.0;
};
SalesData add(const SalesData&, const SalesData&);
std::ostream &print(std::ostream&, const SalesData&);
std::istream &read(std::istream&, SalesData&);
#endif
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