fork(1) download
copy 
  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	unsigned int n; double s_2, r;
  7. 	cin >> n;
  8. 	if ((n < 3) || (n > 5)) cout << "Solution does not exist." << endl;
  9. 	else
  10. 	{
  11. 		s_2 = sin(M_PI/n);
  12. 		s_2 *= s_2; //Возведение синуса во вторую степень.
  13. 		r = sqrt(1 - 1/(4.0*s_2));
  14. 		cout << r << endl;
  15. 	}
  16. 	return 0;
  17. }
Success #stdin #stdout 0s 3460KB
comments (?)
stdin
copy 
5
stdout
copy 
0.525731
https://ideone.com/J8LBHC
KM2
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!