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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int l;
  6. 	cin>>l;
  7. 	double p=3.14;
  8. 	double r=l/(2*p);
  9. 	double S=p*(r*r);
  10. 	cout<<S;
  11. 	return 0;
  12. }
Success #stdin #stdout 0s 4236KB
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https://ideone.com/QYQU9k
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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