题解 | #求解立方根#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextDouble()) { // 注意 while 处理多个 case
            double a = in.nextDouble();
            double b = calculateCubeRoot(a);
            System.out.println(b);
        }
    }


    public static double calculateCubeRoot(double number) {
        boolean isFuShu = false;
        if (number < 0) {
            isFuShu = true;
            number = -1 * number;
        }

        double epsilon = 0.00001; // 精度，可以调整以满足需求
        double x = number; // 初始估计值

        while (Math.abs(x * x * x - number) >= epsilon) {
            x = (2 * x + number / (x * x)) / 3;
        }

        double result = Math.round(x * 10.0) / 10.0; // 保留一位小数

        if(isFuShu) {
            result = (-1) * result;
        } 

        return result;
    }


}