课堂练习 书籍促销(贪心算法)

 1 // ConsoleApplication6.cpp : 定义控制台应用程序的入口点。
 2 //
 3 #include "stdafx.h"
 4 int _tmain(int argc, _TCHAR* argv[])
 5 {
 6     return 0;
 7 }
 8 #include<iostream>
 9 using namespace std;
10 float price;
11 void tanxin(int book)
12 {
13     int yushu;
14     yushu = book % 5;
15     switch (yushu)
16     {
17     case 0:
18         price = book * 8 * 0.75;
19         break;
20     case 1:
21         price = (book - yushu) * 8 * 0.75 + 8;
22         break;
23     case 2:
24         price = (book - yushu) * 8 * 0.75 + 2 * 8 * 0.95;
25         break;
26     case 3:
27         price = (book - yushu) * 8 * 0.75 + 4 * 8 * 0.8 * 2 - 5 * 8 * 0.75;
28         if (book<5)
29         {
30             price += 0.4;
31         }
32         break;
33     case 4:
34         price = (book - yushu) * 8 * 0.75 + 4 * 8 * 0.8;
35         break;
36     default:
37         cout << "Error!" << endl;
38 
39     }
40 }
41 void main()
42 {
43     int i= 0;
44     while (i== 0)
45     {
46         int book;
47         cout << "购买本数(tip:输入正整数):";
48         cin >> book;
49         tanxin(book);
50         cout << "最低价格:" << price << endl;
51         cout << "还要买吗?(tip:输入0继续,输入任意键退出)";
52         cin >> i;
53     }
54 }