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  1. #include <iostream>
  2. #define pi 3.14159
  3. using namespace std;
  4. long double r,area;
  5. int main(){
  6.     cin>>r;     area=(r*r)*pi;
  7.     cout.setf(ios::fixed,ios::floatfield);
  8.     cout.precision(4);
  9.     cout <<"A=" << area;
  10.     return 0;
  11. }
  12.  
Success #stdin #stdout 0s 3432KB
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stdin
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stdout
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A=12.5664
https://ideone.com/hiebng
2
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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