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#ifndef SALES_DATA_H
#define SALES_DATA_H
#include <string>
struct SalesData;
SalesData add(const SalesData&, const SalesData&);
std::ostream &print(std::ostream&, const SalesData&);
std::istream &read(std::istream&, SalesData&);
struct SalesData {
SalesData() = default;
SalesData(const std::string &s): BookNo(s) { }
SalesData(const std::string &s, unsigned n, double p):
BookNo(s), UnitsSold(n), Revenue(p*n) { }
SalesData(std::istream &sdcin) { read(sdcin, *this); };
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;
};
double SalesData::avg_price() const {
if (UnitsSold)
return Revenue / UnitsSold;
else
return 0;
}
SalesData& SalesData::combine(const SalesData &rhs) {
UnitsSold += rhs.UnitsSold;
Revenue += rhs.Revenue;
return *this;
}
std::istream &read(std::istream &is, SalesData &item) {
double price = 0;
is >> item.BookNo >> item.UnitsSold >> price;
item.Revenue = price * item.UnitsSold;
return is;
}
std::ostream &print(std::ostream &os, const SalesData &item) {
os << item.isbn() << " " << item.UnitsSold << " "
<< item.Revenue << " " << item.avg_price();
return os;
}
SalesData add(const SalesData sd1, const SalesData sd2) {
SalesData sdsum = sd1;
sdsum.combine(sd2);
return sdsum;
}
#endif
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