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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6. 	int r;
  7. 	cin >> r;
  8.  
  9. 	if (r > 0) {
  10. 		double A = r * r * 3.14;
  11. 		cout << A << endl;
  12. 	} else {
  13. 		cout << "Not a circle." << endl;
  14. 	}
  15.  
  16. 	return 0;
  17. }
Success #stdin #stdout 0.01s 5292KB
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Not a circle.
https://ideone.com/mrzp7q
language:
C++14 (gcc 8.3)
created:
323 days ago
visibility:
secret

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