Leet Code OJ 168. Excel Sheet Column Title [Difficulty: Easy]

Posted Lnho

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题目:
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 

翻译:
给定一个正数,返回它类似Excle中对应的列标题。

分析:
关联问题:“Excel Sheet Column Number
实际为10进制转26进制,但是需要注意的地方是如果取模为0的时候,需要向前借位,否则结果就不正确了。

代码:

public class Solution {
    public String convertToTitle(int n) {
        String result="";
        while(true){
            int num=n%26;
            if(num==0){
                num=26;
                n-=26;
            }
            char c=(char)(num-1+'A');
            result=c+result;
            if(n<26){
                break;
            }
            n/=26;
        }
        return result;
    }
}

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