[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.

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 String

 

 

思路：遇到空格并且下一个字符不是空格或者‘’ ,len 清零，否则++；

class Solution {
    public:
        int lengthOfLastWord(const char *s)
        {
            const char *p = s;
            int len = 0;

            p = s;
            while(*p != '')
            {
                if(*p == ' ')
                {
                    if(*(p+1) != ' ' && *(p+1) != '')
                        len = 0;
                }
                else
                    len ++;
                p++;
            }

            return len;
        }
};