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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.  
  10. 	if (r > 0) {
  11. 		// ALGORITHM
  12. 		double A = r * r * 3.14;
  13.  
  14. 		// OUTPUT
  15. 		cout << A << endl;
  16. 	} else {
  17.  
  18. 		cout << "Not a circle." << endl;
  19.  
  20. 	}
  21.  
  22. 	return 0;
  23. }
Success #stdin #stdout 0.01s 5548KB
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-10
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Not a circle.
https://ideone.com/saygC4
Conditional Statement: if-else.
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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