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ex7_11_sales_data.h
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ex7_11_sales_data.h
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#ifndef CP5_ex7_11_h
#define CP5_ex7_11_h
#include <iostream>
#include <string>
// Add constructors to your Sales_data class
struct Sales_data {
Sales_data() = default;
Sales_data(const std::string& s) : bookNo(s) {}
Sales_data(const std::string& s, unsigned n, double p)
: bookNo(s), units_sold(n), revenue(n * p)
{
}
Sales_data(std::istream& is);
std::string isbn() const { return bookNo; };
Sales_data& combine(const Sales_data&);
std::string bookNo;
unsigned units_sold = 0;
double revenue = 0.0;
};
// nonmember functions
std::istream& read(std::istream& is, Sales_data& item)
{
double price = 0;
is >> item.bookNo >> item.units_sold >> price;
item.revenue = price * item.units_sold;
return is;
}
std::ostream& print(std::ostream& os, const Sales_data& item)
{
os << item.isbn() << " " << item.units_sold << " " << item.revenue;
return os;
}
Sales_data add(const Sales_data& lhs, const Sales_data& rhs)
{
Sales_data sum = lhs;
sum.combine(rhs);
return sum;
}
// member functions.
Sales_data::Sales_data(std::istream& is)
{
read(is, *this);
}
Sales_data& Sales_data::combine(const Sales_data& rhs)
{
units_sold += rhs.units_sold;
revenue += rhs.revenue;
return *this;
}
#endif