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  1. #include <iostream>
  2. #include<iomanip>
  3. using namespace std;
  4. int main() {
  5.     double R,area;
  6.     const double PI=3.141592653;
  7.     cin>>R;
  8.     area=PI*R*R;
  9.     cout<<fixed<<setprecision(9)<<"area = "<<area;
  10.     return 0;
  11. }
Success #stdin #stdout 0.01s 5280KB
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stdin
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Standard input is empty
stdout
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area = 0.000000000
https://ideone.com/slj7lo
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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