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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	float pi = 3.14;
  6. 	int r;
  7. 	cin >> r;
  8. 	cout << fixed << setprecision(2) <<(float)2*pi*r << endl;
  9. 	return 0;
  10. }
Success #stdin #stdout 0.01s 5308KB
comments (?)
stdin 
2
stdout 
12.56
https://ideone.com/cKSTxa
language:
C++ (gcc 8.3)
created:
14 days ago
visibility:
public

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