dream come true !(2)

dream come true !(2)

count_word:
思想：用一个变量标志单词的开始和结束，也就是说 what i do is to judge where the word begin and where the word end
notes: maybe the interviewer didnot give enough information deliberately,they want me to check this detail,so i should communication with him to check the definition of word.

int  count_word( char   * s)
{
   if ( null   ==  s)
      return   0 ;
    int  count  =   0 ;
    int  i  =   0 ,flag  =   0 ;
    while (s[i]  !=   ' \0 ' )
    {
      if (isalpha(s[i])  &&  flag  ==   0 )
      {
        flag  =   1  ; //  word begin
        count  ++ ;
      }
      else   if (flag  ==   1 )
       {
         if ( ! isalpha(s[i])  &&  s[i]  !=   ' _ ' )
         flag  =   0 ;
         else   if (s[i]  ==   ' _ ' )
          {
            if ( ! isalpha(s[i + 1 ]))
              flag  =   0 ;
         }    
       }
      i ++ ;
    }
   return  count;
}