func_code_string: #include <bits/stdc++.h>   using namespace std;   int t, n;   long double ang, ca, PI = acos(-1);   int main() {     ;     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     ;     cin >> t;     while (t--) {       cin >> n;       ang = 2 * PI / (2 * n);       ca = 0.5 / tan(ang / 2);       cout << fixed << setprecision(10) << 2 * ca <<   n ;     }     return 0;   }   