import java.util.Scanner;

public class DieDai {
    public static void main(String[] args) {
        double epsilon, x0, x1;
        long i, maxi;
        System.out.println("请输入X的精度要求");
        Scanner scan = new Scanner(System.in);
        epsilon = scan.nextDouble();
        System.out.println("请输入迭代初值");
        x1 = scan.nextDouble();
        System.out.println("请输入最大迭代次数");
        maxi = scan.nextInt();
        FangCheng pc = new FangCheng();
        for (i = 0; i < maxi; i++) {
            x0 = x1;
            x1 = pc.picard(x0);
            if (Math.abs(x1 - x0) <= epsilon) {
                break;
            }
            if (i < maxi) {
                System.out.println("方程f(x) = 0的根：" + x1);
            } else
                System.out.println("迭代次数以超过上限");
        }
    }

}

public class FangCheng {
    double picard(double x) {

        return (Math.pow(x, 3) + 3 * Math.pow(x, 2) - 3 * x - 3);
    }
}