Question

AverageGrade.
Assume the professor gives five exams during the semester with grades 0 through 100 and drops one of the exams with the lowest grade. Write a program to find the average of the remaining four grades. The program should use a class named Exams that has
An instance variable to hold a list of five grades,
A method that calculate and return average.
A string that return the “exams Average” for printing.
Your program output should prompt for an input for each grade. Use any number between 0 and 100.
Your submission should include compiled output.
In Java Please

Answer 1

Step 1 : Save the following code in Exams.java

import java.util.Scanner;

public class Exams {
   private int[] marks;
   private static int count = 0;
   public Exams() {
       marks = new int[5];
   }
   public void addMark(int mark) {
       if(count < 5) {
           marks[count++] = mark;
       }
   }
   public float calculateAverage() {
       int min = 101;
       // First find out minimum mark
       for(int i = 0; i < 5; i++) {
           if(marks[i] < min) {
               min = marks[i];
           }
       }
       // Skip minimum mark and find out total
       int i = 0;
       float total = 0;
       for(; i < 5; i++) {
           if(marks[i] == min) {
               break;
           } else {
               total += marks[i];
           }
       }
       i++;
       // After skipping minimum add remaining marks
       for(; i < 5; i++) {
           total += marks[i];
       }
       return total / (count - 1);
   }
   @Override
   public String toString() {
       return "Exams Average = " + calculateAverage();
   }
   public static void main(String[] args) {
       // Scanner object to read input
       Scanner reader = new Scanner(System.in);
       // Create Exams object
       Exams ex = new Exams();
       int mark;
       System.out.println("Enter the marks for 5 exams : ");
       for(int i = 0; i < 5; i++) {
           System.out.print("Enter mark" + (i+1) + " (0-100): ");
           mark = reader.nextInt();
           if(mark < 0 || mark > 100) {
               System.out.println("Invalid input. Please try again. " + mark);
               reader.close();
               return;
           }
           ex.addMark(mark);
       }
       reader.close();
       System.out.println(ex);
   }

}

Step 2 : Build the project and run the program

Following is my sample output