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 
...

Example 1:

Input: 1
Output: “A”
Example 2:

Input: 28
Output: “AB”
Example 3:

Input: 701
Output: “ZY”

C++
string convertToTitle(int n) {
        string result = "";
        while(n)
        {
            n = n - 1;
            result = (char)('A' + n % 26) + result;
            n = n / 26;
        }
        return result;
    }