题解 | #求解立方根#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNext()) { 
            double a = in.nextDouble();
            double b = a/2;
            for(;;){
                if(a==Double.parseDouble(String.format("%.3f",Math.pow(b,3)))) break;
                if((a>0&&Math.pow(b,3)>a)||(a<0&&Math.pow(b,3)<a)){
                    b=b/2;
                }else if((a>0&&Math.pow(b,3)<a)||(a<0&&Math.pow(b,3)>a)){
                    b=(b*2+b)/2;
                }
            }
            System.out.println(String.format("%.1f",b));
        }
    }
}