// Grade verification -- the while loop example extended.

import java.util.Scanner;

class LoopExample4 {

   public static void main (String[] args) {
 
      Scanner scan = new Scanner(System.in);

      int grade = 9999, count = 0, max = 0;
      float sum = 0, avarage;

      while (grade != -1) {

         System.out.print ("Enter grade (-1, if done): ");
         System.out.flush ();
         grade = scan.nextInt();

         if (grade >= 0 && grade <= 100) {
           count = count + 1;
           sum = sum + grade;
           if (grade > max)
              max = grade;
         }
         else 
           System.out.println("Invalide grade -- enter again.");
      }
  
   if (count == 0)
     System.out.println ("No grades enterred.");
   else {
     avarage = sum / count;
     System.out.println ("The avarage grade is " + avarage);
     System.out.println ("The highest grade is " + max);
     }
   }
}