leetcode 168 Excel Sheet Column Title

Given a positive integer, return its corresponding column title as appear in an Excel sheet.

For example:

    1 -> A
    2 -> B
    3 -> C
    ...
    26 -> Z
    27 -> AA
    28 -> AB 

Credits:
Special thanks to @ifanchu for adding this problem and creating all test cases.

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class Solution {
public:
    string convertToTitle(int n) {
        string res = "";

		while(n > 0) {
			int mod = n%26;
			if(mod > 0) {
			    res += ('A'+mod-1);
			    n = n/26;
			}
			else if(mod == 0) {
			    res += 'Z';
			    n = n/27;
			}
		}

		reverse(res.begin(), res.end());
		return res;
    }
};