ClassAverage2.java

package Chapter4;
import java.util.Scanner;
public class ClassAverage2 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        int total = 0;
        int gradeCounter = 0;

        System.out.print("Enter grade (or -1 to quit): ");
        int grade = input.nextInt();

        while (grade != -1) {
            total = total + grade;
            gradeCounter = 1 + gradeCounter;

            System.out.print("Enter grade (or -1 to quit): ");
            grade = input.nextInt();

        }
        if (gradeCounter != 0) {
            double average = (double) total/gradeCounter;
               System.out.printf("%nTotal of the %d grades entered is %d%n", gradeCounter, total);
               System.out.printf("Class average is %.3f%n", average);
        }
        else {
            System.out.println("No grades were entered");
        }
    }
}