题解 | #求解立方根#

import java.util.*; public class Main { static double i=0.0; public static void main( String [] agrs){ Scanner sc = new Scanner(System.in); double input= sc.nextDouble(); getResult(input,20.0,-20);

    System.out.print((double)Math.round(i*10)/10);
}
//迭代函数

public static void getResult(double input, double max, double min) {

    if (input>0) {
        i = (max + min) / 2;
        double s=i*i*i;
        //精度控制在0.01级别
        if ((s- input <= 0.01 && s - input >= 0) ) {
            return;
        }
        if (s - input > 0.01 ) {
            getResult(input, i, min);
        } else {
            getResult(input, max, i);
        }
    } else {
        i = (min + max) / 2;
        double s=i*i*i;
        if ((input-s <= 0.01 && input-s >= 0) ) {
            return;
        }
        if (input-s > 0.01 ) {
            getResult(input, max, i);
        } else {
            getResult(input, i, min);
        }

    }

}

}