public class Example1
{
    public enum LetterGrade
    {
       F, D, DPLUS, CMINUS, C, CPLUS, BMINUS, B, BPLUS, AMINUS, A       
    }
    

    public static void main(String[] args)
    {
	    double avg, cs139points, cs239points;
		 LetterGrade cs139, cs239;
		 
		 cs139 = LetterGrade.BPLUS;
		 cs239 = LetterGrade.B;
		 
		 System.out.printf ("Grade in CS139: %s\n", formatGrade(cs139));
		 System.out.printf ("Grade in CS239: %s\n", formatGrade(cs239));
		 
		 if (cs139.compareTo(cs239) > 0 )
		 {
		    System.out.println ("I did worse in CS239 than in CS139");
		 }
		 else if (cs139.compareTo(cs239) < 0)
		 {
		    System.out.println (" I did better in CS239 than in CS139");
		 }
		 else
		 {
		   System.out.println (" I got the same grade in CS239 and CS139");
   	 }
		  
		 cs139points = pointsGrade(cs139);
		 cs239points = pointsGrade(cs239);
		 avg = (cs139points + cs239points)/2.0;
		 System.out.println ("Average for CS139 and CS239: " + avg );
 	 }


    public static String formatGrade(LetterGrade grade)
    {
       String          s;
       
       if      (grade.equals(LetterGrade.A))      s = "A";
       else if (grade.equals(LetterGrade.AMINUS)) s = "A-";
       else if (grade.equals(LetterGrade.BPLUS))  s = "B+";
       else if (grade.equals(LetterGrade.B))      s = "B";
       else if (grade.equals(LetterGrade.BMINUS)) s = "B-";
       else if (grade.equals(LetterGrade.CPLUS))  s = "C+";
       else if (grade.equals(LetterGrade.C))      s = "C";
       else if (grade.equals(LetterGrade.CMINUS)) s = "C-";
       else if (grade.equals(LetterGrade.DPLUS))  s = "D+";
       else if (grade.equals(LetterGrade.D))      s = "D";
       else                                       s = "F";

       return s;    
    }



    public static double pointsGrade(LetterGrade grade)
    {
       double          points;
       
       if      (grade.equals(LetterGrade.A))      points = 4.0;
       else if (grade.equals(LetterGrade.AMINUS)) points = 3.7;
       else if (grade.equals(LetterGrade.BPLUS))  points = 3.3;
       else if (grade.equals(LetterGrade.B))      points = 3.0;
       else if (grade.equals(LetterGrade.BMINUS)) points = 2.7;
       else if (grade.equals(LetterGrade.CPLUS))  points = 2.3;
       else if (grade.equals(LetterGrade.C))      points = 2.0;
       else if (grade.equals(LetterGrade.CMINUS)) points = 1.7;
       else if (grade.equals(LetterGrade.DPLUS))  points = 1.3;
       else if (grade.equals(LetterGrade.D))      points = 1.0;
       else                                       points = 0.0;

       return points;    
    }

    
}