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Sales_item.h
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Sales_item.h
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///*
// * This file contains code from "C++ Primer, Fifth Edition", by Stanley B.
// * Lippman, Josee Lajoie, and Barbara E. Moo, and is covered under the
// * copyright and warranty notices given in that book:
// *
// * "Copyright (c) 2013 by Objectwrite, Inc., Josee Lajoie, and Barbara E. Moo."
// *
// *
// * "The authors and publisher have taken care in the preparation of this book,
// * but make no expressed or implied warranty of any kind and assume no
// * responsibility for errors or omissions. No liability is assumed for
// * incidental or consequential damages in connection with or arising out of the
// * use of the information or programs contained herein."
// *
// * Permission is granted for this code to be used for educational purposes in
// * association with the book, given proper citation if and when posted or
// * reproduced.Any commercial use of this code requires the explicit written
// * permission of the publisher, Addison-Wesley Professional, a division of
// * Pearson Education, Inc. Send your request for permission, stating clearly
// * what code you would like to use, and in what specific way, to the following
// * address:
// *
// * Pearson Education, Inc.
// * Rights and Permissions Department
// * One Lake Street
// * Upper Saddle River, NJ 07458
// * Fax: (201) 236-3290
//*/
//
///* This file defines the Sales_item class used in chapter 1.
// * The code used in this file will be explained in
// * Chapter 7 (Classes) and Chapter 14 (Overloaded Operators)
// * Readers shouldn't try to understand the code in this file
// * until they have read those chapters.
//*/
//
//#ifndef SALESITEM_H
//// we're here only if SALESITEM_H has not yet been defined
//#define SALESITEM_H
//
//// Definition of Sales_item class and related functions goes here
//#include <iostream>
//#include <string>
//
//class Sales_item {
//// these declarations are explained section 7.2.1, p. 270
//// and in chapter 14, pages 557, 558, 561
//friend std::istream& operator>>(std::istream&, Sales_item&);
//friend std::ostream& operator<<(std::ostream&, const Sales_item&);
//friend bool operator<(const Sales_item&, const Sales_item&);
//friend bool
//operator==(const Sales_item&, const Sales_item&);
//public:
// // constructors are explained in section 7.1.4, pages 262 - 265
// // default constructor needed to initialize members of built-in type
// Sales_item() = default;
// Sales_item(const std::string &book): bookNo(book) { }
// Sales_item(std::istream &is) { is >> *this; }
//public:
// // operations on Sales_item objects
// // member binary operator: left-hand operand bound to implicit this pointer
// Sales_item& operator+=(const Sales_item&);
//
// // operations on Sales_item objects
// std::string isbn() const { return bookNo; }
// double avg_price() const;
//// private members as before
//private:
// std::string bookNo; // implicitly initialized to the empty string
// unsigned units_sold = 0; // explicitly initialized
// double revenue = 0.0;
//};
//
//// used in chapter 10
//inline
//bool compareIsbn(const Sales_item &lhs, const Sales_item &rhs)
//{ return lhs.isbn() == rhs.isbn(); }
//
//// nonmember binary operator: must declare a parameter for each operand
//Sales_item operator+(const Sales_item&, const Sales_item&);
//
//inline bool
//operator==(const Sales_item &lhs, const Sales_item &rhs)
//{
// // must be made a friend of Sales_item
// return lhs.units_sold == rhs.units_sold &&
// lhs.revenue == rhs.revenue &&
// lhs.isbn() == rhs.isbn();
//}
//
//inline bool
//operator!=(const Sales_item &lhs, const Sales_item &rhs)
//{
// return !(lhs == rhs); // != defined in terms of operator==
//}
//
//// assumes that both objects refer to the same ISBN
//inline Sales_item& Sales_item::operator+=(const Sales_item& rhs)
//{
// units_sold += rhs.units_sold;
// revenue += rhs.revenue;
// return *this;
//}
//
//// assumes that both objects refer to the same ISBN
//inline Sales_item
//operator+(const Sales_item& lhs, const Sales_item& rhs)
//{
// Sales_item ret(lhs); // copy (|lhs|) into a local object that we'll return
// ret += rhs; // add in the contents of (|rhs|)
// return ret; // return (|ret|) by value
//}
//
//inline std::istream&
//operator>>(std::istream& in, Sales_item& s)
//{
// double price;
// in >> s.bookNo >> s.units_sold >> price;
// // check that the inputs succeeded
// if (in)
// s.revenue = s.units_sold * price;
// else
// s = Sales_item(); // input failed: reset object to default state
// return in;
//}
//
//inline std::ostream&
//operator<<(std::ostream& out, const Sales_item& s)
//{
// out << s.isbn() << " " << s.units_sold << " "
// << s.revenue << " " << s.avg_price();
// return out;
//}
//
//inline double Sales_item::avg_price() const
//{
// if (units_sold)
// return revenue/units_sold;
// else
// return 0;
//}
//#endif
#ifndef SALESITEM_H
#define SALESITEM_H
#include <string>
#include <iostream>
using namespace std;
struct Sales_item{
string bookNo;
unsigned int units_sold=0;
double revenue=0.0;
};
#endif