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.

#include<iostream>#include<string>#include<vector>using namespace std;int lengthOfLastWord(const char *s) {if (s==NULL)return 0;int laslen =0;while (*s!='\0'){if (*s!=' '){int curlen = 0;while(*s!='\0'&&*s!=' ')s++,curlen++;laslen = curlen;}elses++;}return laslen;}