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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6. 	//input
  7. 	int r;or //declare r as int
  8. 	cin >> r;
  9. 	//algorithm
  10. 	double A=r*r*3.14;
  11. 	//output
  12. 	cout << A;
  13.  
  14. 	return 0;
  15.  
  16. }
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/48HkjX
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language:
C++14 (gcc 8.3)
created:
7 days ago
visibility:
public

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