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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6. 	// INPUT
  7. 	int r;
  8. 	cin >> r;
  9. 	// ALGORITHM
  10. 	double A = r * r * 3.14;
  11. 	// OUTPUT
  12. 	cout << A << endl;
  13.  
  14. 	return 0;
  15. }
Success #stdin #stdout 0.01s 5288KB
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452.16
https://ideone.com/Yr2Qhw
language:
C++14 (gcc 8.3)
created:
323 days ago
visibility:
secret

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