POJ 1131

#include <iostream>
#include <string>
using namespace std;

int ans[3000];

int main()
{
    //freopen("acm.acm","r",stdin);
    string s;
    int index;
    int i;
    int j;
    int c;
    int r;
    while(cin>>s)
    {
        index = 1;
    
        for(i = s.length()-1; i > 1; -- i)
        {
                ans[0] += s[i]-‘0‘;
                c = 0;
                r = 0;
                for(j = 0; j < index; ++ j)
                {
                    c = (ans[j]+r*10)/8;
                    r = (ans[j]+r*10)%8;
                    ans[j] = c;
                }
                while(r)
                {
                    ans[j] = (r*10)/8;
                    r = (r*10)%8;
                    ++ j;
                }
                index = j;
        }
        c = 0;
        cout<<s<<" [8] = 0.";
        for(i = 1; i < index; ++ i)
        {
            cout<<ans[i];
        }
        cout<<" [10]"<<endl;
    }
}