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  1.  
  2. #include<iostream>       
  3. #include<math.h>
  4. #include<iomanip>
  5.  
  6. using namespace std;
  7.  
  8. int r;
  9. int d;
  10. double wynik;
  11.  
  12. int main()
  13. {	 
  14. 	const double Pi= 3.141592654;
  15.  
  16. 	while(cin >> r >> d)
  17. 	{ 
  18. 	     wynik =  (pow(r, 2) - pow(d, 2) / 4)*Pi;
  19.  
  20. 		 cout << fixed << setprecision(2) << wynik << endl;
  21.     }
  22.  
  23.  
  24. 	return 0;
  25. }
  26.  
Success #stdin #stdout 0s 4380KB
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stdin
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10 10 
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2000 2000
0 10
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stdout
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235.62
1374446.79
9424777.96
-78.54
314.16
267.04
https://ideone.com/VYRL1D
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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