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  1. import java.util.*;
  2.  
  3. class Main
  4. {
  5. 	static double e = Math.exp(1);
  6.  
  7. 	static double bin_pow(double x, int n){
  8. 		if(n == 1) return x;
  9. 		if(n%2 == 1) return bin_pow(x, n-1)*x;
  10. 		double b = bin_pow(x, n/2);
  11. 		return b*b;
  12. 	}
  13.  
  14. 	static double Rn(int n){
  15. 		double v = e/(2*n+1);
  16. 		return bin_pow(v, 2*n+1)/(1-v*v);
  17. 	}
  18.  
  19. 	public static void main (String[] args)
  20. 	{
  21. 		Scanner in = new Scanner(System.in);
  22. 		double eps, sum = 0, last=0;
  23. 		int n = 0;
  24. 		eps = in.nextDouble();
  25. 		do{
  26. 			n++;
  27. 			if(n > 1) last /= (2*n-2)*(2*n-1);
  28. 			else last = 1;
  29. 			sum += last;
  30. 		} while(Rn(n) > eps);
  31. 		System.out.print("Количество взятых членов ряда: " + n + "\nЗначение суммы: " + String.format("%.10f",sum));
  32. 	}
  33. }
Success #stdin #stdout 0.14s 2841600KB
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stdin
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1e-10
stdout
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Количество взятых членов ряда: 7
Значение суммы: 1.1752011936
https://ideone.com/psW34U
D2655B
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
secret

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