README.md

Excel Sheet Column Number

Related to question Excel 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 

Credits: Special thanks to @ts for adding this problem and creating all test cases.

Solution

进制转化，比如2进制转化成10进制

Code

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

扩展

逆过程Excel Sheet Column Title