#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(false); //读入输出优化的强迫症
    int a, b, c;
    while (true) {
        cin >> a >> b >> c;
        //设置输出为小数点后c位
        cout << fixed << setprecision(c);
        if (a == 0 && b == 0 && c == 0) break;
        double d = 1.0 * a / b;
        cout << d << endl;
    }
    return 0;
}