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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <cmath>
  4. using namespace std;
  5.  
  6. int main() {
  7. 	double r;
  8. 	cin >> r;
  9. 	cout << fixed << setprecision(4) << 2*M_PI*r << " " << M_PI*r*r;
  10. 	return 0;
  11. }
Success #stdin #stdout 0s 15232KB
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313
stdout 
1966.6370 307778.6907
https://ideone.com/ONqQ9p
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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