Untitled

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int i, n;
    double u, v, a, t, s;

    for(i = 1 ; ; i++)
    {
        cin >> n;
        if(n == 0)
        {
            break;
        }
        if(n == 1)
        {
            cin >> u >> v >> t;
            a = (v - u) / t;
            s = (u*t)+(0.5)* a *(t*t);
            cout << "case " << fixed << setprecision(3)  << i << ": "<< s << " " << a;
        }
        else if(n == 2)
        {
            cin >> u >> v >> a;
            t = (v - u) / a;
            s = (u*t)+(0.5)* a *(t*t);
            cout << "case " << fixed << setprecision(3) << i << ": " << s << " " << t;
        }
        else if(n == 3)
        {
            cin >> u >> a >> s;
            v = sqrt(u*u+2*a*s);
            t = v-u/a;
            cout << "case "  << fixed << setprecision(3) << i << ": "<< v << " " << t;
        }
        else if(n == 4)
        {
            cin >> v >> a >> s;
            u = sqrt(v*v-2*a*s);
            t = (v - u)/a;
            cout << "case " << fixed << setprecision(3)  << i << ": " << u << " " << t;
        }
    }


    return 0;
}