func_code_string: #include <bits/stdc++.h>   using namespace std;   void dbg_out() { cerr <<   b b] n ; }   template <typename Head, typename... Tail>   void dbg_out(Head H, Tail... T) {     cerr << H <<  ,  ;     dbg_out(T...);   }   void solve() {     long double n;     cin >> n;     cout << fixed << setprecision(10);     if (n == 2) {       long double ans = 1;       cout << ans <<   n ;       return;     }     n *= 2;     const double pi = acosl((long double)-1);     double radian = pi / n;     double radius = 1.0 / tan(radian);     cout << radius <<   n ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(nullptr);     int t = 0;     cin >> t;     while (t--) {       solve();     }     return 0;   }   