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  1. #include <iostream>
  2. #include<cmath>
  3. using namespace std;
  4.  
  5. double f(double x)
  6. {
  7. 	return log(1 + x*x - sin(x)) - pow(3, cos(2*x));
  8. }
  9.  
  10. double findRoot(double a, double b, double e)
  11. {
  12. 	while (b - a > e)
  13. 	{
  14. 		if (f(a) * f((b + a) / 2) == 0)
  15. 			break;
  16. 		else if (f(a) * f((b + a) / 2) > 0)
  17. 			a = (b + a) / 2;
  18. 		else
  19. 			b = (b + a) / 2;
  20. 	}
  21. 	return (b + a) / 2;
  22. }
  23.  
  24. int main() 
  25. {
  26. 	double e;
  27. 	cin >> e;
  28. 	cout << findRoot(-4, -3, e) << endl;
  29. 	cout << findRoot(-3, -2, e) << endl;
  30. 	cout << findRoot(-1, 0, e) << endl;
  31. 	cout << findRoot(1, 2, e) << endl;
  32. 	cout << findRoot(2, 3, e) << endl;
  33. 	cout << findRoot(3, 4, e) << endl;
  34. 	return 0;
  35. }
Success #stdin #stdout 0s 3464KB
comments (?)
stdin
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0.00001
stdout
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-3.42634
-2.75443
-0.836887
1.2171
2.72062
3.41392
https://ideone.com/EO6jYc
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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