购买《哈利波特》书籍问题

 1 #include<iostream.h>
 2 void main()
 3 {
 4     int num;//本数
 5     int record;//商
 6     int remainder;//余数
 7     double price;
 8     int n=1;
 9     while(n)
10     {
11         cout<<"请输入您买书的本数："<<endl;
12         cin>>num;
13         record=num/5;
14         remainder=num%5;
15         if(record>=2)
16         { 
17             record--;
18             remainder=remainder+5;
19         }
20         if(num<=5)
21         {
22             switch(num)
23             {
24             case 0:
25                 price=0;
26                 break;
27             case 1:
28                 price=8;
29                 break;
30             case 2:
31                 price=16*(1-0.05);
32                 break;
33             case 3:
34                 price=24*(1-0.1);
35                 break;
36             case 4:
37                 price=32*(1-0.2);
38                 break;
39             case 5:
40                 price=40*(1-0.25);
41                 break;
42             default:
43                 break;
44             }
45         }
46         else
47         {
48             switch(remainder)
49             {
50             case 5:
51                 price=record*40*(1-0.25)+40*(1-0.25);
52                 break;
53             case 6:
54                 price=record*40*(1-0.25)+40*(1-0.25)+8;
55                 break;
56             case 7:
57                 price=record*40*(1-0.25)+40*(1-0.2)+16*(1-0.05);
58                 break;
59             case 8:
60                 price=record*40*(1-0.25)+32*(1-0.2)*2;
61                 break;
62             case 9:
63                 price=record*40*(1-0.25)+40*(1-0.25)+32*(1-0.2);
64                 break;
65             default:
66                 break;
67             }
68         }
69         cout<<"购买"<<num<<"本书的最低价格是："<<price<<"元"<<endl;
70         cout<<"继续输入1，退出输入0"<<endl;
71         cin>>n;
72     }
73 }