Length of Last Word输出最后单词的字母个数

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

class Solution {
public:
    int lengthOfLastWord(const char *s) {
        if(s==NULL)
            return ;
        int len=;
        const char *start = s;
        while(*s!='\0'){
            if(*s==' '){
                int le=s-start;
                if(le!=)
                    len=le;
                start=s+;
                s++;
            }else
                s++;
        }
        int le=s-start;
        if(le!=)
            len=le;
        return len;
    }
};