Excel Sheet Column Number-LeetCode

Excel Sheet Column Number--LeetCode

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 

思路：进制之间的转化，不过这里需要考虑的是这里没有0这个数，不过可以模26，然后对于结果是0的看做26.

string convertToTitle(int n) 
{
    string result;
    int num = n;
    int temp;
    while(num)
    {
       temp = num%26;
       temp = temp ==0? 26:temp;
       result += (temp+'A'-1);
       num = (num-temp)/26;       
    }    
    reverse(result.begin(),result.end());
    return result;    
}