购书问题

 1 #include<iostream.h>
 2 
 3 void show(int x , double &sum)
 4 {
 5     if(x==6)
 6     {
 7         cout<<"5本一组，1本一组来购买";
 8         sum=sum+5*8*0.75+8;
 9     }
10     if(x==7)
11     {
12         cout<<"5本一组，2本一组来购买";
13         sum=sum+5*8*0.75+2*8*0.95;
14     }
15     if(x==8)
16     {
17         cout<<"4本一组，4本一组来购买";
18         sum=sum+8*8*0.8;
19     }
20     if(x==9)
21     {
22         cout<<"5本一组，4本一组来购买";
23         sum=sum+5*8*0.75+4*8*0.8;
24     }
25 }
26 
27 void main()
28 {
29     cout<<"请输入要购买的本数："<<endl;
30     int num,a,b,i;
31     double sum=0;
32     cin>>num;
33     cout<<"最优惠的方案是："<<endl;
34     a=num%10;
35     if(a>5)
36     {
37         b=num/5;
38         for(i=1;i<=b;i++)
39         {
40             cout<<"5组一本，";
41         }
42         sum=sum+b*8*5*0.75;
43         show(a,sum);
44     }
45     else if(a<5&&a>0)
46     {
47         a=a+5;
48         b=num/5-1;
49         for(i=1;i<=b;i++)
50         {
51             cout<<"5组一本，";
52         }
53         sum=sum+b*8*5*0.75;
54         show(a,sum);
55     }
56     else
57     {
58         b=num/5;
59         for(i=1;i<=b;i++)
60         {
61             cout<<"5组一本，";
62         }
63         sum=sum+b*8*5*0.75;
64     }
65     cout<<endl<<"一共花费"<<sum<<"元"<<endl;
66 }