java 来自https://leetcode.com/problems/base-7/description/

Posted 2021-05-08

public class Solution {
    public String convertToBase7(int num) {
        
        if(num < 0){
            return "-" + convertToBase7(-num);
        }
        if(num < 7){
            return num + "";
        }
        return convertToBase7(num /7) + num % 7;
    }
}