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.

class Solution{
public:
     int lengthOfLastWord(const char *s){
         int count=0,last=0;
         while(*s)
         {
             if(*s++!=' ')
             {
                 count++;
             }
             else if(count>0)
             {
                 last=count;
                 count=0;
             }
         }
         return (count>0)?count:last;
     }
 };