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  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	long double r;
  7. 	cin>> r;
  8. 	long double pi = 3.141592653589793238462643383279502884197169399375105820974944592307816406286;
  9. 	long double p = (r*r)*pi;
  10. 	cout << fixed << setprecision(30) << p << endl;
  11. 	return 0;
  12. }
Success #stdin #stdout 0.01s 5272KB
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stdin
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4.4444444444
stdout
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62.056151180779481731086821838517
https://ideone.com/BqNRPu
language:
C++ (gcc 8.3)
created:
6 hours ago
visibility:
public

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