1 #include <iostream>
 2 #include <stack>
 3 #include <stdio.h>
 4 using namespace std;
 5 
 6 int main()
 7 {
 8     double num1;
 9     char ch;
10     while (cin>>num1)
11     {
12         stack<double> data;
13         ch=getchar();
14         if (num1==0&&ch==‘\n‘)
15         {
16             break;
17         }//结束
18 
19         double num2;
20         while (cin>>ch)
21         {
22             if (ch==‘+‘||ch==‘-‘)
23             {
24                 cin>>num2;
25                 if (ch==‘-‘) num2=-num2;
26                 data.push(num1);
27                 num1=num2;
28                 ch=getchar();
29                 if (ch==‘\n‘)
30                 {
31                     data.push(num1);
32                     break;
33                 }
34             }
35             if (ch==‘*‘||ch==‘/‘)
36             {
37                 cin>>num2;
38                 if(ch==‘*‘)
39                 {
40                     num1*=num2;
41                     ch=getchar();
42                     if (ch==‘\n‘)
43                     {
44                         data.push(num1);
45                         break;
46                     }
47                 }
48                 if (ch==‘/‘)
49                 {
50                     num1/=num2;
51                     ch=getchar();
52                     if (ch==‘\n‘)
53                     {
54                         data.push(num1);
55                         break;
56                     }
57                 }        
58             }
59         }
60         double ans=0;
61         while (!data.empty())
62         {
63             ans+=data.top();
64             data.pop();
65         }
66         printf("%.2lf\n",ans);
67     }
68     return 0;
69 }