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  1. import java.io.BufferedReader;
  2. import java.io.IOException;
  3. import java.io.InputStreamReader;
  4.  
  5. public class Main {
  6.  
  7.  
  8.     public static double round(double val, int places) {
  9.         long factor = (long)Math.pow(10,places);
  10.         val = val * factor;
  11.         long tmp = Math.round(val);
  12.        return (double)tmp / factor;
  13.     }
  14.  
  15. 	public static void main(String[] args) {
  16.  
  17. 		double Pi=3.141592654;
  18. 		double r=0.00,d=0.00,wyn=0.00,a=0.00,b=0.00,h_kwadrat=0.00;
  19.  
  20. 		BufferedReader stdin = new BufferedReader( new InputStreamReader(System.in));
  21. 		try {
  22. 			String[] linia = stdin.readLine().split(" ");
  23. 			double rDouble  = Double.parseDouble(linia[0]);
  24. 			r=rDouble;
  25. 			double dDouble =  Double.parseDouble(linia[1]);
  26. 			d=dDouble;
  27. 		} catch (Exception e) {
  28. 			System.exit(1);
  29. 		}
  30.  
  31.  
  32. 	      b=r;
  33. 	      a=d/2;
  34. 	      h_kwadrat=(b*b) - (a*a);
  35. 	      wyn = h_kwadrat*Pi;
  36. 	      wyn = round(wyn, 2);
  37.  
  38. 	      System.out.println(wyn);
  39.  
  40. 	}
  41. }
Success #stdin #stdout 0.04s 213312KB
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https://ideone.com/iAeD9
language:
Java (HotSpot 12)
created:
15 years ago
visibility:
secret

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