第七章 类

7.1

 1 #include <iostream>
 2 #include <vector>
 3 #include <cctype>
 4 #include <string>
 5 #include <iterator>
 6 #include <initializer_list>
 7 #include <cassert>
 8 
 9 using namespace std; 
10 
11 struct Sales_data{
12     string bookNo;
13     unsigned units_sold = 0;
14     double revenue = 0.0;         //单价 
15 }; 
16 
17 int main()  
18 {     
19     Sales_data total;
20     if (cin >> total.bookNo >> total.units_sold >> total.revenue) {
21         Sales_data trans;
22         while (cin >> trans.bookNo >> trans.units_sold >> trans.revenue) {
23             if (trans.bookNo == total.bookNo) {
24                 total.units_sold += trans.units_sold;
25             }
26             else {
27                 cout << total.bookNo << "的销售额为：" << total.units_sold * total.revenue << endl;
28                 total.bookNo = trans.bookNo;
29                 total.units_sold = trans.units_sold;
30                 total.revenue = trans.revenue;
31             }
32         }
33         cout << total.bookNo << "的销售额为：" << total.units_sold * total.revenue << endl;
34     }
35     else {
36         cerr << "No data?!" << endl; 
37     }
38     return 0; 
39 }

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