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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <math.h>
  4.  
  5. using namespace std;
  6.  
  7. int main()
  8. {
  9.     double r,d, pi=3.141592654;
  10.     double wynik;
  11.     for (int a=0; a<20; a++)
  12.     {
  13.         cin >> r >> d;
  14.         wynik=((r*r)-((d*d)/4))*pi;
  15.         cout << fixed << setprecision(2) << wynik << endl;
  16.  
  17.     }
  18.     return 0;
  19. }
Success #stdin #stdout 0s 15232KB
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https://ideone.com/f6wF8H
language:
C++ 4.3.2 (gcc-4.3.2)
created:
5 years ago
visibility:
public

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