LeetCode: Excel Sheet Column Title

It's a transition from 10 notation to 26 notation. The trick is that counting starts from 1 not 0. So we need to minus 1 to get the right alphabet.
1->A
2->B
26->Z
27->AA
...
52->AZ

In line 6: (n-1)%26 makes result ranges from 0 to 25
                e.g. when n=26, (n-1)%26=25;
                       when n=25, (n-1)%26=24;
                       when n=1,   (n-1)%26=0
In line 7:  makes (n-1)/26 =0 when n is from 1 to 26.
                e.g. when n=26, (n-1)/26 =0;
                       when n=1,   (n-1)/26 =0;

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class Solution { public: string convertToTitle(int n) { string result; while(n!=0){ result=(char)('A'+(n-1)%26)+result; n=(n-1)/26; } return result; } };

Reference: http://www.cnblogs.com/EdwardLiu/p/4179867.html