Answer to Question #245291 in Java | JSP | JSF for Tidex

Question

Create a program that takes in a student’s full names and marks for 3 In-class exercises, then calculate the average of this marks. This average mark is then categorized as follows: Marks obtained Grade Level Message 80 – 100 1 Magnificent!! 70 – 79 2 Excellent!! 60 – 69 3 Good work!! 50 – 59 4 Good!! 2 DUE DATE: MONDAY 06 OCTOBER 2021 BEFORE 23h59 0 – 49 0 Fail – Try again next Year!! Greater than 100 or less than 0 X Invalid Marks!!, Marks too high. Or Invalid Marks!!, Negative marks not allowed.

Sample run 1:

Enter student full names: Goodluck Johnathan

Enter 3 marks separated by spaces: 78 94.6 88

Output: Student name: Goodluck Johnathan

Grade Level: 1

Comment: Magnificent!!

Sample run 2:

Enter student full names: Ellen Johnson Sirleaf

Enter 3 marks separated by spaces: 200 104.87 99.9

Output: Student name: Ellen Johnson Sirleaf

Grade Level: X

Comment: Invalid Marks!!, Marks too high.

Answer 1

import java.util.Scanner;

public class StudentGrades {
    public static int determineGradeLevel(double averageMark)
    {
        if(averageMark>=80 && averageMark<=100)
            return 1;
        if(averageMark>=70 && averageMark<80)
            return 2;
        if(averageMark>=60 && averageMark<70)
            return 3;
        if(averageMark>=50 && averageMark<60)
            return 4;
        return 0;
    }

    public static String getGradeComment(double gradeLevel)
    {
        if(gradeLevel == 1)
            return "Magnificent";
        if(gradeLevel == 2)
            return "Excellent";
        if(gradeLevel == 3)
            return "Good work";
        if(gradeLevel == 4)
            return "Good";
        return "Fail - Try again next Year";
    }

    public static boolean isValidMark(double mark)
    {
        return mark >= 0 && mark <= 100;
    }
    public static boolean isValidMarks(double firstMark, double secondMark, double thirdMark)
    {
        return isValidMark(firstMark) && isValidMark(secondMark) && isValidMark(thirdMark);
    }

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

        System.out.print("Enter student fullname: ");
        String studentName = userInput.nextLine();

        System.out.print("Enter 3 marks separated by spaces: ");
        double firstMark = userInput.nextDouble();
        double secondMark = userInput.nextDouble();
        double thirdMark =  userInput.nextDouble();

        System.out.println();
        System.out.println("Output:");
        System.out.println("Student name: " + studentName);

        if(isValidMarks(firstMark, secondMark, thirdMark)) {
            double averageMark = (firstMark + secondMark + thirdMark) / 3;
            int gradeLevel = determineGradeLevel(averageMark);
            String commentForGrade = getGradeComment(gradeLevel);

            System.out.println("Grade Level: " + gradeLevel);
            System.out.println("Comment: " + commentForGrade + "!!");
        }
        else
        {
            System.out.println("Grade Level: "+"X");
            System.out.print("Comment: "+ "Invalid marks!!");

            if(firstMark > 100 || secondMark > 100 || thirdMark > 100)
                System.out.print("Marks too high.");
            else
                System.out.println("Marks too low.");
        }
    }
}