504. 十进制转换为7进制（考虑负数的情况）Base 7

Given an integer, return its base 7 string representation.

Example 1:

Input: 100
Output: "202"

Example 2:

Input: -7
Output: "-10"

Note: The input will be in range of [-1e7, 1e7].

public class Solution {
    public string ConvertToBase7(int num) {
		if (num == 0) {
			return "0";
		}
		int number = Math.Abs(num);
		string str = "";
		while (number > 0) {
			int n = number % 7;
			str = n.ToString() + str;
			number /= 7;
		}
		if (num < 0) {
			str = "-" + str;
		}
		return str;
    }
}

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