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.

Solution:

Code:

<span style="font-size:14px;">class Solution {public:    int lengthOfLastWord(const char *s) {        int index = 0, length = 0;        bool word = false;        while (s[index] != '\0') {            if (s[index] == ' ')                word = false;            else                if (word) ++length;                else {                    word = true;                    length = 1;                }            ++index;        }        return length;    }};</span>