leetcode 168 excel sheet column title

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

For example:

1
2
3
4
5
6
7

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

1
2
3
4
5
6
7
8
9
10

class  {
    public String convertToTitle(int n) {
        String result = "";
        while(n>0){
            result = (char) ('A' + (n-1)%26 ) + result;
            n = (n-1)/26;
        }
        return result;
    }
}

• Consider it as a digit transform problem.
• Notice that the first char is A which corresponse to number 0, so there should be n-1.