LeetCode 58. 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.

程序代码：

int lengthOfLastWord(char* s) {
    int count = 0;
    int i=strlen(s)-1;
    while(s[i]==' ')
        i--;
    while(s[i]!=' '&&i>=0)
        {
            count++;
            i--;
        }
        return count;
}