leetcode - Length of Last Word

题目描述：点击此处

此题一时兴起，居然从前面开始扫描，真是疯了。

class Solution {
public:
  int lengthOfLastWord(const char *s) {
    // Start typing your C/C++ solution below
    // DO NOT write int main() function
    if (s==NULL)
      return 0;
    int i = 0;
    int len = 0;
    int lastLen = 0;
    while (s[i]!=0){
      if ((s[i]>='a'&&s[i]<='z') || (s[i]>='A'&&s[i]<='Z'))
        len++;
      else{
        if (len !=0)
        lastLen = len;
        len=0;
      }
      i++;
    }
    if (len ==0)
      return lastLen;
    return len;
  }
};