leetcode - Length of Last Word

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example,
Given s = "Hello World",
return 5.

class Solution {
public:
    int lengthOfLastWord(const char *s) {
		int cnt = 0,result = 0;
		while (*s != '\0')
		{
			cnt = *s == ' ' ? 0 : cnt + 1;
			result = cnt > 0 ? cnt : result;
			s++;
		}
		return result;
    }
};