sales_item是什么

sales_item是什么
#include
#include "sales_item.h"
using namespace std;
int main ()
{
sales_item book;
cin >> book;
cout

c++prime里的吧,sales_item是附加的一个类把它加上去就行了,直接给你吧
/*
* This file contains code from "C++ Primer,Fourth Edition",by Stanley B.
* Lippman,Jose Lajoie,and Barbara E.Moo,and is covered under the
* copyright and warranty notices given in that book:
*
* "Copyright (c) 2005 by Objectwrite,Inc.,Jose 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 Contracts Department
* 75 Arlington Street,Suite 300
* Boston,MA 02216
* Fax:(617) 848-7047
*/
#ifndef SALESITEM_H
#define SALESITEM_H
// Definition of Sales_item class and related functions goes here
#include
#include
class Sales_item {
friend bool operator==(const Sales_item&,const Salep>e="text"fy">fy">fy">fy">fy">fy">fy">fy"> s_item&);
// other members as before
public:
// added constructors to initialize from a string or an istream
Sales_item(const std::string &book):
isbn(book),units_sold(0),revenue(0.0) { }
Sales_item(std::istream &is) { is >> *this; }
friend std::istream& operator>>(std::istream&,Sales_item&);
friend std::ostream& operato