package cs3250;

public class CountWords 
{
   /**
    * Counts the number of words in a string that end with either "g" or "s"	
    * @param str -- an incoming sentence
    * @return word_count -- the number of words
    */
   public static int count(String str) 
   {
      int word_count = 0;    
      char last = ' ';      
    
      for (int i=0; i<str.length(); i++)
      {
         // check if the current character is a non-letter (i.e., end of the word)  
         // and the character previously read was "g" or "s"         
         if (!Character.isLetter(str.charAt(i)) && (last == 'g' || last == 's'))
            word_count++;

         last = str.charAt(i);  
      }    
      
      if (last == 'g' || last == 's')
         word_count++;
      
      return word_count;       
   }    
}