func_code_string: #include <bits/stdc++.h>   using namespace std;   const double pi = acos(-1.0);   const double eps = pi / 180.0;   int main() {     int t;     cin >> t;     while (t--) {       double n;       cin >> n;       double angle = 180.0 / n;       double first = 1.0 / 2.0 / sin(angle / 2.0 * eps);       double a1 = 180.0 / n * round(n / 4.0);       double a2 = 90 - a1;       double ans = first * (sin(a1 * eps) + sin(a2 * eps)) / sin(45.0 * eps);       printf( %.9lf n , ans);     }     return 0;   }   