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  1. #include <iostream>
  2. #include<iomanip>
  3. using namespace std;
  4. int main() {
  5. 	double d;
  6. 	cin >> d;
  7. 	cout << fixed <<  showpoint << setprecision(4) << "A=" << d*d*3.14159 << endl;
  8. 	return 0;
  9. }
Success #stdin #stdout 0s 15240KB
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Standard input is empty
stdout
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A=0.0000
https://ideone.com/VcmCxV
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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