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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	float r;
  6. 	cin >> r;
  7. 	const double PI = 3.141592653589793;
  8. 	const double C = 2 * PI * r;
  9. 	const double S = PI * r * r;
  10. 	cout << C << " " << S << endl;
  11. 	return 0;
  12. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/sQnto6
language:
C++ (gcc 8.3)
created:
6 hours ago
visibility:
public

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