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  1. #include<iostream>
  2. #include<iomanip>
  3. using namespace std;
  4. int main()
  5. {
  6.      cout << fixed << setprecision(9);
  7.      float n;
  8. long double m = 3.141592653 ;
  9. cin >>n;
  10. cout<< m*n*n<<endl;
  11. }
Success #stdin #stdout 0.01s 5516KB
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stdin
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Standard input is empty
stdout
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0.000000000
https://ideone.com/QxFwmI
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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