题目描述

blablabla

样例

blablabla

算法

import java.util.*;
public class Main {
public static void main(String args[]){

    Scanner nums = new Scanner(System.in);
    double n = nums.nextDouble();
    int fuHao = 1;

    //把负数变为正数
    if(n < 0){
        fuHao = -1;
        n = -n;
    }

    double l = 0;
    double r = 0;
    double mid = 0;
    double cha = 0;
    double deta = 0;

    if(n >= 1){
        l = 0;
        r = n;
        mid = ( l + r ) / 2;
        cha = mid * mid * mid -  n;
        deta = Math.abs(cha);
    }else{
        l = n;
        r = 1;
        mid = ( l + r ) / 2;
        cha = mid * mid * mid -  n;
        deta = Math.abs(cha);
    }

    while(deta >= 0.0000000001){
        if(cha > 0){
            r = mid;
        }else{
            l = mid;
        }
        mid = ( l + r ) / 2;
        cha = mid * mid * mid -  n;
        deta = Math.abs(cha);
    }
    mid = mid * fuHao;
    System.out.printf("%.6f",mid);
}

}