168 Excel Sheet Column Title

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

For example:

    1, A    2, B    3, C    ...    AA, Z        

The meaning of the topic is probably like this, given a positive number, return the column headings in the Excel table
In fact, from the pest can be seen in fact is a decimal to 26 binary problem
Here's my solution:
Programme one:
      Using the Loop method, each time the remainder is converted into the corresponding character form, added to the string and finally the string is reversed

1 classSolution {2  Public:3    stringConverttotitle (intN) {4           if(n<1)return "";5           Else{6           stringresult="";7           Charch;8            while(n) {9n--;TenCH = n% -+'A'; Oneresult+=ch; AN/= -; -           } - Reverse (Result.begin (), Result.end ()); the           returnresult; -           } -     } -};

It is noteworthy that the n--is one of the problems that arises when N is a multiple of 26, and if it is the case that ch=n%26+64 will appear ' @ '

The second scenario:

In a recursive way

1#include <iostream>2#include <string>3 using namespacestd;4 classSolution {5  Public:6     stringConverttotitle (intN) {7           Static strings="";8           intp=0;9           if(n) {Tenn--; Onep = n% -; AConverttotitle (n/ -); -              if(P) -s+= (Char) (p+'A'); the           } -           returns; -     } - }; + intMain () { -Solution *s =Newsolution; +    //cout<<s->converttotitle () <<endl; ACout<<s->converttotitle ( -); at     return 0; -}

Because the static keyword is used, the function has a problem with successive calls, so there is no AC, just a way of thinking.

The first option is to be AC-

168 Excel Sheet Column Title