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  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	double A, p = 3.14159, R;
  7. 	cin >> R;
  8. 	A = p * R * R;
  9. 	cout << fixed << setprecision(4);
  10. 	cout << "A=" << A << endl;
  11. 	return 0;
  12. }
Success #stdin #stdout 0s 3476KB
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A=12.5664
https://ideone.com/lQPoPh
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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