SD1 Java Programming Task

import java.util.Scanner;

public class StudentMarks {

    public static String[] studentNames = new String[10];
    public static double[] studentMarks = new double[10];
    public static int studentCount = 0;

    public static double calculateAverage(String studentName) {

        for (int i = 0; i < studentCount; i++) {
            if (studentNames[i].equalsIgnoreCase(studentName)) {
                return studentMarks[i];
            }
        }
        return -1;
    }

    public static double calculateClassAverage() {
        double totalMarks = 0;
        for (int i = 0; i < studentCount; i++) {
            totalMarks += studentMarks[i];
        }
        return studentCount > 0 ? totalMarks / studentCount : 0;
    }

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

        for (int i = 0; i < 5; i++) {
            System.out.print("Enter student name: ");
            studentNames[i] = scanner.nextLine();

            System.out.print("Enter marks for " + studentNames[i] + ": ");
            studentMarks[i] = scanner.nextDouble();
            scanner.nextLine();
            studentCount++;
        }

        boolean addMoreStudents = true;
        while (addMoreStudents && studentCount < studentNames.length) {
            System.out.print("Enter additional student name (or type 'exit' to stop): ");
            String additionalName = scanner.nextLine();

            if (additionalName.equalsIgnoreCase("exit")) {
                addMoreStudents = false;
            }
            else {
                System.out.print("Enter marks for " + additionalName + ": ");
                double additionalMarks = scanner.nextDouble();
                scanner.nextLine();

                studentNames[studentCount] = additionalName;
                studentMarks[studentCount] = additionalMarks;
                studentCount++;
            }
        }

        System.out.print("Enter a student name to check their marks: ");
        String studentName = scanner.nextLine();

        double studentAverage = calculateAverage(studentName);
        if (studentAverage != -1) {
            System.out.println(studentName + "'s mark is: " + studentAverage);
        }
        else {
            System.out.println(studentName+ " not found.");
        }
        double classAverage = calculateClassAverage();
        System.out.println("Class average mark: " + classAverage);

        scanner.close();
    }
}