/*
   @author Alex Chu
   Inherits A3: QuizMeas Bk
*/

interface Measurable
{
   default double getMeasure()
   { return 0; }
}

public class QuizTester_2ChuA
{
   public static void main( String[] args )
   {

      Quiz q1 = new Quiz(50);
      Quiz q2 = new Quiz(55);
      Quiz q3 = new Quiz(60);
      Quiz q4 = new Quiz(65);
      Quiz q5 = new Quiz(70);
      Quiz q6 = new Quiz(75);
      Quiz q7 = new Quiz(80);
      Quiz q8 = new Quiz(85);
      Quiz q9 = new Quiz(95);
      Quiz q10 = new Quiz(95);

      Measurable quizS[] = { q1, q2, q3, q4, q5, q6, q7, q8, q9, q10 };

      /*
      int[] quizS;
      quizS = new int[10];
      */

      /*
      Measurable[] quizS = new Quiz[10];

      for( int i = 0; i < quizS.length; i++ )
      {  }
      */

      double avg = Data.average( quizS );
      System.out.println("Average score: " + avg );

      Measurable largest = Data.max( quizS );
      System.out.println("Largest score: " + largest.getMeasure() );

      Measurable highest = Data.max( quizS );
      System.out.println("Highest grade: " + ( (Quiz)highest).getGrade() );
   }
}

class Data
{
   public static double average( Measurable[] objects )
   {
      double sum = 0;
      for( Measurable obj: objects )
      {
         sum = sum + obj.getMeasure();
      }
      if( objects.length > 0 )
      { return sum / objects.length; }
      else { return 0; }
   }
   public static Measurable max( Measurable[] objects )
   {
      Measurable maxObj = objects[0];
      for( Measurable obj : objects )
      {
         if( maxObj.getMeasure() < obj.getMeasure())
         {
            maxObj = obj;
         }
      }
      return maxObj;
   }
}

class Quiz implements Measurable
{
   private String grade;
   private double score;

   public Quiz( double theScore )
   {
      score = theScore;
   }

   public String getGrade()
   {
      return grade;
   }

   public double getMeasure()
   {
      gradeScale();
      return score;
   }

   public void gradeScale()
   {

      if ( score >= 97 )
      { grade.equals("A+"); }

      else if ( score >= 93 )
      { grade.equals("A"); }

      else if ( score >= 90 )
      { grade.equals("A+"); }

      else if ( score >= 87 )
      { grade.equals("B+"); }

      else if ( score >= 83 )
      { grade.equals("B"); }

      else if ( score >= 80 )
      { grade.equals("B-"); }

      else if ( score >= 77 )
      { grade.equals("C+"); }

      else if ( score >= 73 )
      { grade.equals("C"); }

      else if ( score >= 70 )
      { grade.equals("C-"); }

      else if ( score >= 67 )
      { grade.equals("D+"); }

      else if ( score >= 63 )
      { grade.equals("D"); }

      else if ( score >= 60 )
      { grade.equals("D-"); }

      else if ( score >= 0 )
      { grade.equals("F"); }
   }
}