Student.java

package project0;

import java.io.DataInputStream;

import javax.sound.midi.VoiceStatus;

class Student
{
    private int rollno;
    private String name;
    DataInputStream dis = new DataInputStream(System.in);
    public void getrollno()
    {
         try
         {
             System.out.print("Enter roll no");
             rollno = Integer.parseInt(dis.readLine());
             System.out.print("Enter name");
             name = dis.readLine();
         }

         catch(Exception) {}
    }
    void putrollno{}
    {
        System.out.print("Roll No ="+rollno);
        System.out.print("Name = "+name);
    }
}

class Marks extends Student
{
    protected int m1,m2,m3;
    void getmarks{}
    {
        try
        {
            System.out.print("Enter marks:");
            m1 = Integer.parseInt(dis.readLine());
            m2 = Integer.parseInt(dis.readLine());
            m3 = Integer.parseInt(dis.readLine());
        }

        catch(Exception e) {}
    }

    void putmarks{}
    {
        System.out.print("m1 = "+m1);
        System.out.print("m2 = "+m2);
        System.out.print("m3 = "+m3);
    }
}

class Result extends Marks
{
    private float total;
    void compute_display()

    {
        total = m1 + m2 + m3;
        System.out.print("Total Marks = "+total);
    }
}

class Multilevel
{
    public static void public static void main(String[] args) {
        Result r = new Result();
        r.getrollno();
        r.getmarks();
        r.putrollno();
        r.putmarks();
        r.compute_display();
    }
}