GradeCal.java

import java.util.Scanner;

class Grade {
    double mark;
    String grade;
    /** Construct a Grade with a specified mark*/
    public Grade(double m) {
            mark = m;
        }
        /** Return the obtained grade*/
    public String getGrade() {
        if (mark >= 85 && mark <= 100) {
            grade = "High Distinction";
        } else if (mark >= 75 && mark < 84) {
            grade = "Distinction";
        } else if (mark >= 65 && mark < 75) {
            grade = "Credit";
        } else if (mark >= 50 && mark < 65) {
            grade = "Pass";
        } else if (mark >= 0 && mark < 50) {
            grade = "Fail";
        } else {
            grade = "Mark does not match";
        }
        return grade;
    }
}
public class GradeCal {
    public static void main(String[] args) {
        //declare scanner object to read the keyboard
        Scanner input = new Scanner(System.in);
        //reads mark
        System.out.print("Enter mark: ");
        Double examMark = input.nextDouble();
        Grade ob = new Grade(examMark);
        System.out.println("You got " + ob.mark + " mark so your grade is " +
            ob.getGrade());

    }
}