Classes that first recognize C + +

Sales_item.h
#ifndef salesitem_h#define salesitem_h#include <iostream> #include <string>class sales_item{public:std:: IStream &input (std::istream & in), std::ostream & Output (std::ostream & Out) const;double avg_price () Const;bool SAME_ISBN (sales_item& Rhs) const; Sales_item Add (sales_item& other); Sales_item::sales_item (): unit_sale (0), revenue (0) {}private:std::string ISBN;//ISBN int unit_sale;//quantity Double Revenue;//total price}; #endif

Sales_item.cpp#include "sales_item.h" std::istream& sales_item::input (std::istream & In) {double price;in >> ISBN >> Unit_sale >> price;if (in) revenue = Unit_sale*price;else{unit_sale = 0;revenue = 0.0;} Return in;} std::ostream& sales_item::output (std::ostream & Out) const{out << ISBN << "\ t" << Unit_sale << "\ t" << revenue << "\ t" << avg_price (); return out;} Double Sales_item::avg_price () const{if (unit_sale) return Revenue/unit_sale;elsereturn 0.0; BOOL SALES_ITEM::SAME_ISBN (sales_item& rhs) const{return ISBN = = rhs.isbn;} Sales_item sales_item::add (sales_item& other) {unit_sale + = other.unit_sale;revenue + Other.revenue;return *this;}

　　

Main.cpp#include <iostream>//#include <string>//#include <vector>//#include <cctype>//# Include <cstring>//#include <bitset> #include "sales_item.h" using namespace Std;int main (int argc, char * * Argv) {sales_item total, trans;cout << ' Enter some transaction (ctrl + Z to end) ' << endl;if (total.input (CIN)) {//read into the first trade while (trans.input (CIN)) {if (total.same_isbn (trans)) total.add (trans); else{total.output (cout); trans;}} Output last trade total.output (cout) << endl;} Else{cout << "No data!" << endl;return-1;} cout << Endl;system ("pause"); return 0;}

　　

　　

Classes that first recognize C + +