Problem 1

CODE:

import java.util.Scanner;
 
class STUDENT {
    String name;
    int[] marks = new int[3];
 
    STUDENT(String name, int[] marks) {
        this.name = name;
        this.marks = marks;
    }
 
    void compute() {
        int total = 0;
        for (int m : marks) total += m;
        double avg = total / 3.0;
        System.out.println("Total: " + total);
        System.out.println("Average: " + avg);
    }
 
    void display() {
        System.out.println("Name: " + name);
    }
}
 
class ScienceStudent extends STUDENT {
    int practicalMarks;
 
    ScienceStudent(String name, int[] marks, int practicalMarks) {
        super(name, marks);
        this.practicalMarks = practicalMarks;
    }
 
    @Override
    void compute() {
        int total = practicalMarks;
        for (int m : marks) total += m;
        double avg = total / 4.0;
        System.out.println("Total (with practical): " + total);
        System.out.println("Average: " + avg);
    }
 
    void displayPracticalMarks() {
        System.out.println("Practical Marks: " + practicalMarks);
    }
}
 
class ArtsStudent extends STUDENT {
    String electiveSubject;
 
    ArtsStudent(String name, int[] marks, String electiveSubject) {
        super(name, marks);
        this.electiveSubject = electiveSubject;
    }
 
    void displayElective() {
        System.out.println("Elective Subject: " + electiveSubject);
    }
}
 
public class ProblemOne {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter name for general student: ");
        String n1 = sc.nextLine();
        int[] m1 = new int[3];
        System.out.println("Enter 3 marks:");
        for (int i = 0; i < 3; i++) m1[i] = sc.nextInt();
        STUDENT s1 = new STUDENT(n1, m1);
 
        sc.nextLine();
        System.out.print("Enter name for science student: ");
        String n2 = sc.nextLine();
        int[] m2 = new int[3];
        System.out.println("Enter 3 marks:");
        for (int i = 0; i < 3; i++) m2[i] = sc.nextInt();
        System.out.print("Enter practical marks: ");
        int p = sc.nextInt();
        ScienceStudent s2 = new ScienceStudent(n2, m2, p);
 
        sc.nextLine();
        System.out.print("Enter name for arts student: ");
        String n3 = sc.nextLine();
        int[] m3 = new int[3];
        System.out.println("Enter 3 marks:");
        for (int i = 0; i < 3; i++) m3[i] = sc.nextInt();
        sc.nextLine();
        System.out.print("Enter elective subject: ");
        String e = sc.nextLine();
        ArtsStudent s3 = new ArtsStudent(n3, m3, e);
 
        STUDENT ref;
 
        System.out.println("\n--- General Student ---");
        ref = s1;
        ref.display();
        ref.compute();
 
        System.out.println("\n--- Science Student ---");
        ref = s2;
        ref.display();
        ref.compute();
        s2.displayPracticalMarks();
 
        System.out.println("\n--- Arts Student ---");
        ref = s3;
        ref.display();
        ref.compute();
        s3.displayElective();
    }
}
 

OUTPUT:

Enter name for general student: Achu
Enter 3 marks:
23 35 56
Enter name for science student: SomeGuy
Enter 3 marks:
34 66 56
Enter practical marks: 23
Enter name for arts student: ArtsMan  
Enter 3 marks:
23 46 90
Enter elective subject: Environmental science
 
--- General Student ---
Name: Achu
Total: 114
Average: 38.0
 
--- Science Student ---
Name: SomeGuy
Total (with practical): 179
Average: 44.75
Practical Marks: 23
 
--- Arts Student ---
Name: ArtsMan
Total: 159
Average: 53.0
Elective Subject: Environmental science