二分发求解

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        while(scan.hasNext()){
            Double num = scan.nextDouble();
            double left = 0, right = num, mid = 0;
            //一定要注意边界条件，输入的num可能是负数  将x<-1的边界范围定为[x,1]，x>1的边界范围定为[-1,x]
            right = Math.max(1.0,num);
            left = Math.min(-1.0,num);
            while(right - left > 0.01){
                mid = left + (right - left) / 2;
                if(mid * mid * mid < num){
                    left = mid;
                }else if(mid * mid * mid > num){
                    right = mid;
                }else{
                    return;
                }
            }
            System.out.printf("%.1f",mid);
        }
    }
}