func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);     srand(time(NULL));     ;     int T = 1;     cin >> T;     while (T--) {       int n;       cin >> n;       cout << setprecision(10)            << cos(3.141592653589793238 / (4 * n)) /                   sin(3.141592653589793238 / (2 * n));       cout <<   n ;     }     return 0;   }   