第四个WA，不知道怎么错了，求大佬帮改

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

int main()
{
	double a, b, c, d;
	cin >> a >> b >> c >> d;

	for (double i = -100; i < 100; i++)
	{
		double answer_left = a * i * i * i + b * i * i + c * i + d;
		double answer_right = a*(i+1)*(i+1)*(i+1) + b*(i+1)*(i+1) + c * (i + 1) + d;
		//cout<<"x1 = "<< i << " "<<"x2 = " << i+1<< " " << "y1 = " << answer_left << " " << "y2 = " << answer_right << endl;
		//如果两值一正一负，在i到i+1中一定有一个实数根
		if (answer_left * answer_right < 0)
		{
			for (double j = i * 100; j <= i * 100 + 100; j++)
			{
				if (a * pow(j/100, 3) + b * pow(j/100, 2) + c * j/100 + d == 0)
				{
					cout << fixed << setprecision(2) << j / 100 <<" ";
					break;
				}
			}
		}
		if (fabs(answer_left) < 0.00001) 
		{
			cout << fixed << setprecision(2) << i << " ";
		}

	}
	return 0;
}