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.

C++:
01 int lengthOfLastWord(const char *s) {
02     bool flag=false;
03     int cnt=0;
04     for(int i=0;s[i]!=;i++){
05         if(flag==true){
06            if(((s[i]>=‘a’)&&(s[i]<=‘z’))||
07               ((s[i]>=‘A’)&&(s[i]<=‘Z’)))
08                  cnt++;
09            else
10                  flag=false;
11         }
12         else if(((s[i]>=‘a’)&&(s[i]<=‘z’))||
13                 ((s[i]>=‘A’)&&(s[i]<=‘Z’))){
14                 flag=true;
15                 cnt=1;
16         }
17    }
18    return cnt;
19 }
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