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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     double R;
  6.     scanf("%lf", &R);
  7.  
  8.     double A = 3.14155 * R * R;
  9.     printf("A=%.4lf\n", A);
  10.     return 0;
  11. }
Success #stdin #stdout 0.01s 5316KB
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stdin
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Standard input is empty
stdout
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A=0.0000
https://ideone.com/aSsVmo
language:
C++14 (gcc 8.3)
created:
7 days ago
visibility:
public

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