1. 题目

https://tianchi.aliyun.com/oj/118289365933779217/122647324212270017

Given an integer, return its base 7 string representation.

输入范围为[-1e7, 1e7] 。

示例
样例 1:
输入: num = 100
输出: 202样例 2:
输入: num = -7
输出: -10

2. 解题

• 除以base得到余数，对所有的余数逆序

class Solution {
public:/*** @param num: the given number* @return: The base 7 string representation*/string convertToBase7(int num) {// Write your code herebool negative = num < 0;if(negative)num = -num;string ans;int base = 7;do{ans += (num%base)+'0';num /= base;}while(num);reverse(ans.begin(), ans.end());if(negative)ans = "-"+ans;return ans;}
};

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