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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main(){
  5.     double R;
  6.     cin>> R;
  7.     double A=3.14159 *R*R;
  8.     cout<<"A="<<A<<endl;
  9.  
  10. 	return 0;
  11. }
Success #stdin #stdout 0s 4320KB
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stdin
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Standard input is empty
stdout
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A=0
https://ideone.com/wIGYt6
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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