// ***************************************************************
//   Grades.java
//
//   Read in a sequence of grades and compute the average
//   grade, the number of passing grades (at least 60)
//   and the number of failing grades.
// **************************************************************

import java.util.Scanner;

public class Grades
{

    public static void main (String[] args)
    {

        Scanner scan = new Scanner(System.in);

        double grade;  // a student's grade
        double sumOfGrades; // a running total of the student grades
        int numStudents; // a count of the students
        int numPass;     // a count of the number who pass
        int numFail;     // a count of the number who fail

        System.out.println ("\nGrade Processing Program\n");

        // Initialize summing and counting variables
        sumOfGrades = 0;
        numStudents = 0;
        numPass = 0;
        numFail = 0;

        // Read in the first grade
        System.out.print ("Enter the first student's grade: ");
        grade = scan.nextDouble();

        while (grade >= 0)
        {
            sumOfGrades = sumOfGrades + grade;
            numStudents = numStudents + 1;

            if (grade < 60)
                numFail = numFail + 1;
            else
                numPass = numPass + 1;

            // Read the next grade
            System.out.print ("Enter the next grade (a negative to quit): ");
            grade = scan.nextDouble();
        }

        if (numStudents > 0)
           {
               System.out.println ("\nGrade Summary: ");
               System.out.println ("Class Average: " + sumOfGrades/numStudents);
               System.out.println ("Number of Passing Grades: " + numPass);
               System.out.println ("Number of Failing Grades: " + numFail);
           }
        else
            System.out.println ("No grades processed.");
        }
}