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
class Solution { public: string convertToTitle(int n) { if(n < 1) return ""; else { string result=""; while(n){ n--; char c= n%26+‘A‘; result=c+result; n/=26; } return result; } } };
注意几个问题；
1 数字转字符时候先--。
2 string += 顺序问题。
原文：http://www.cnblogs.com/footy/p/4543096.html