hdu-1237

http://acm.hdu.edu.cn/showproblem.php?pid=1237

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<stack>
#include<algorithm>

using namespace std;

int main()
{
    double n, m;
    char c;
    while(~scanf("%lf", &n))
    {
        c=getchar();
        if(c=='\n' && n==0)
            break;
        stack<double> Stack;
        Stack.push(n);
        c=getchar();
        while(~scanf("%lf", &m))
        {
            if(c=='+')
                Stack.push(m);
            else if(c=='-')
                 Stack.push(0-m);
            else if(c=='*')
            {
                n=Stack.top();
                Stack.pop();
                Stack.push(n*m);
            }
            else if(c=='/')
            {
                n=Stack.top();
                Stack.pop();
                Stack.push(n/m);
            }
            if(getchar()=='\n')
                break;
            c=getchar();
        }
        double sum=0;
        while(!Stack.empty())
        {
            sum+=Stack.top();
            Stack.pop();
        }
        printf("%.2f\n", sum);
    }
    return 0;
}