Related to questionExcel Sheet Column Title

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

For example:

    A -> 1
    B -> 2
    C -> 3
    ...
    Z -> 26
    AA -> 27
    AB -> 28

int titleToNumber(char* s) {
    int result = 0;
    int bit=0;
    while(*s){
       result = result*26+(*s-'A'+1);
       bit++;
       s++;
    }
    return result;
}