poj1565

简单题

View Code

//zoj1712

#include <iostream>

#include <string>

using namespace std;



string    st;



void work()

{

    int        i, l = st.length(), temp = 1, ans = 0;



    for (i = l - 1; i >= 0; i--)

    {

        temp *= 2;

        ans += (st[i] - '0') * (temp - 1);

    }

    cout << ans << endl;

}



int main()

{

    //freopen("t.txt", "r", stdin);

    while (getline(cin, st) && st != "0")

        work();

    return 0;

}