func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       double n;       cin >> n;       double r = 1 / (2 * tan((360 / (4 * n)) * (3.1415926535 / 180)));       cout << setprecision(15) << 2 * r << endl;     }   }   