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  1. #include <iostream>
  2. #include <math.h>
  3. using namespace std;
  4.  
  5. double f(double x)
  6. {
  7. 	return 9.2*x*x*x+3.3*x*x+4*x-1; //задаем уравнение
  8. }
  9.  
  10. double es(double x, double eps) //с помощью метода Эйтнена-Стеффенсона считаем приближения
  11. {
  12. 	double x0, x1, x2, d;
  13. 	do
  14. 	{
  15. 		x0=x;
  16. 		x1=f(x0);
  17. 		x2=f(x1);
  18. 		d=x0-2*x1+x2;
  19. 		if (d!=0)
  20. 		{
  21. 			x=(x0*x2-x1*x1)/d;
  22. 		}
  23. 		else return x;
  24. 	}
  25. 	while(fabs(x-x0)>eps); //условие окончания подсчета 
  26. 	return x;
  27. }
  28.  
  29. int main() {
  30. 	double x, eps;
  31. 	cin >> x >> eps;
  32. 	cout << es(x, eps);
  33. 	return 0;
  34. }
Success #stdin #stdout 0s 3476KB
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-4 0.0005
stdout
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-3.99981
https://ideone.com/7Zq5rv
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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