笃志好学者: [code=cpp] //Sales_item.h class Sales_item { public: Sales_item():units_sold(0),price(0){}; void read(); void prints(); double avg_price(const Sales_item it1) const{ return (+price)/2; }; private: std::string isbn; unsigned units_sold; double price; }; [/code]
java刷题
c++ primer 习题7.31 自己编写Sales_item类