func_code_string: #include <bits/stdc++.h>   using namespace std;   double pi = M_PI;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int t;     cin >> t;     while (t--) {       long long n;       cin >> n;       n = n * 2;       double angle = ((n - 2) * M_PI) / (2 * n);       cout << fixed << setprecision(9) << tan(angle);       cout <<   n ;     }   }   