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  1. #include <iostream>
  2. #include <cmath> 
  3. using namespace std;
  4.  
  5. double arr(double sum, double a, double E, int i)
  6. {
  7. 	if (fabs(a *= (double)(i + 1) * pow(3 * i, -1)) < E)
  8. 	{
  9. 		return sum;
  10. 	}
  11. 	else
  12. 	{
  13. 		i++;
  14. 		sum += a;
  15. 		return arr(sum, a, E, i);
  16. 	}
  17. }
  18. int main()
  19. {
  20. 	int i=1;
  21. 	double E; // переменная для обозначения точности
  22. 	double a = 1 / 3.0, sum = 1 / 3.0;
  23. 	//присваиваем переменным a(член ряда) и sum значение первого члена ряда
  24. 	cin >> E;
  25. 	cout << arr(sum, a, E, i) << endl;
  26. 	system("pause");
  27. 	return 0;
  28. }
  29.  
Success #stdin #stdout #stderr 0s 3416KB
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stdin
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0.1
stdout
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0.666667
stderr
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sh: 1: pause: not found
https://ideone.com/jCcFIo
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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