//The instances of this class are final objects representing a Letter Grade
// The only LetterGrade objects are A, B, C, D and F
//
//The following public methods are provided
// char letter() : returns 'A', 'B', 'C', 'D' or 'F'
// int points()  : returns 4, 3, 2, 1, or 0
//
public enum LetterGrade
{
   //The possible LetterGrade values
   F, D, C, B, A;

   //Returns the letter corresponding to this LetterGrade
   public char letter()
   {
      return this.toString().charAt(0);
   }
   
   //Returns the grade points corresponding to this LetterGrade
   // A: 4  B: 3  C: 2  D: 1  F: 0  
   public int points()
   {
      return this.ordinal();
   }
}