Excel Sheet Column Title (String-type convertion)

QUESTION

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        

First TRY

classSolution { Public:    stringConverttotitle (intN) {intremain = n% -; N/= -; stringRET =""; Charch;  while(1)        {            if(n = =0&& remain = =0)            {                returnret; }            Else if(n = =0) {ch=GetChar (remain); returnCH +ret; } CH=GetChar (remain); RET= ch + ret;//char-string, direct concatremain = n% -; N/= -; }        returnret; }        CharGetChar (intN) {if(n! =0)            return 'A'+ N-1; Else            return 'Z'; }};

Result:wrong

Input:26
Output: "AZ"
Expected: "Z"

SECOND TRY

Note that the remainder is 0.

classSolution { Public:    stringConverttotitle (intN) {intremain = n% -; N/= -; stringRET =""; Charch;  while(1)        {            if(n = =0&& remain = =0)            {                returnret; }            Else if(n = =0) {ch=GetChar (N,remain); returnCH +ret; } CH=GetChar (N,remain); RET= ch + ret;//char-string, direct concatremain = n% -; N/= -; }        returnret; }        CharGetChar (int& N,intremain) {        if(Remain! =0)            return 'A'+ Remain-1; Else{n-=1; return 'Z'; }    }};

Excel Sheet Column Title (String-type convertion)