StudentGrading.java

import java.util.Scanner;

public class StudentGrading {

    static double[] mathArr = new double[100];
    static double[] phyArr = new double[100];
    static double[] chemArr = new double[100];
    static double[] engArr = new double[100];
    static double[] urduArr = new double[100];
    static String[] nameArr = new String[100];
    static int[] standardArr = new int[100];
    static String[] gradeArr = new String[100];

    static int times = 0;

    // ================= CLI MAIN =================
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        while (true) {
            System.out.println("\nStudent Grading System");
            System.out.println("1. Add Students Marks");
            System.out.println("2. View Student Marks");
            System.out.println("3. View Class Average");
            System.out.println("4. Exit");

            String choice = sc.nextLine();

            if (choice.equals("1")) {
                addStudentsMarks(sc);
            } else if (choice.equals("2")) {
                viewStudentMarks(sc);
            } else if (choice.equals("3")) {
                viewClassAverage();
            } else if (choice.equals("4")) {
                System.out.println("Thank you for using the system!");
                break;
            } else {
                System.out.println("Invalid input!");
            }
        }
    }

    // ================= ADD STUDENT (CLI) =================
    public static void addStudentsMarks(Scanner sc) {

        System.out.print("Enter Name: ");
        String name = sc.nextLine();

        System.out.print("Enter Class: ");
        int standard = sc.nextInt();

        System.out.print("Math: ");
        double math = sc.nextDouble();

        System.out.print("Physics: ");
        double phy = sc.nextDouble();

        System.out.print("Chemistry: ");
        double chem = sc.nextDouble();

        System.out.print("English: ");
        double eng = sc.nextDouble();

        System.out.print("Urdu: ");
        double urdu = sc.nextDouble();
        sc.nextLine();

        mathArr[times] = math;
        phyArr[times] = phy;
        chemArr[times] = chem;
        engArr[times] = eng;
        urduArr[times] = urdu;
        nameArr[times] = name;
        standardArr[times] = standard;

        int index = times;
        times++;

        System.out.println(buildTranscript(index));
    }

    // ================= VIEW STUDENT (CLI) =================
    public static void viewStudentMarks(Scanner sc) {

        System.out.print("Enter student name: ");
        String find = sc.nextLine();

        for (int i = 0; i < times; i++) {
            if (nameArr[i].equalsIgnoreCase(find)) {
                System.out.println(buildTranscript(i));
                return;
            }
        }
        System.out.println("Student not found!");
    }

    // ================= CLASS AVERAGE =================
    public static void viewClassAverage() {

        if (times == 0) {
            System.out.println("No data available!");
            return;
        }

        double mathSum = 0, phySum = 0, chemSum = 0, engSum = 0, urduSum = 0;

        for (int i = 0; i < times; i++) {
            mathSum += mathArr[i];
            phySum += phyArr[i];
            chemSum += chemArr[i];
            engSum += engArr[i];
            urduSum += urduArr[i];
        }

        System.out.println("=================================");
        System.out.println("Math Avg: " + (mathSum / times));
        System.out.println("Physics Avg: " + (phySum / times));
        System.out.println("Chemistry Avg: " + (chemSum / times));
        System.out.println("English Avg: " + (engSum / times));
        System.out.println("Urdu Avg: " + (urduSum / times));
        System.out.println("=================================");
    }

    // ================= CORE TRANSCRIPT LOGIC =================
    public static String buildTranscript(int i) {

        double total = mathArr[i] + phyArr[i] + chemArr[i] + engArr[i] + urduArr[i];

        String grade;
        if (total >= 450) grade = "A*";
        else if (total >= 400) grade = "A";
        else if (total >= 350) grade = "B";
        else if (total >= 300) grade = "C";
        else if (total >= 250) grade = "D";
        else grade = "Fail";

        gradeArr[i] = grade;
        double percent = (total / 500.0) * 100;

        String transcript = "";
        transcript += "=====================================\n";
        transcript += "Name: " + nameArr[i] + "\n";
        transcript += "Class: " + standardArr[i] + "\n";
        transcript += "=====================================\n";
        transcript += "Math: " + mathArr[i] + "\n";
        transcript += "Physics: " + phyArr[i] + "\n";
        transcript += "Chemistry: " + chemArr[i] + "\n";
        transcript += "English: " + engArr[i] + "\n";
        transcript += "Urdu: " + urduArr[i] + "\n";
        transcript += "-------------------------------------\n";
        transcript += "Total: " + total + " / 500\n";
        transcript += "Grade: " + grade + "\n";
        transcript += "Percentage: " + percent + "%\n";
        transcript += "=====================================\n";

        return transcript;
    }

    // ================= JAVA FX SUPPORT =================

    // Add student from FX
    public static String addStudentFromFX(
            String name, int standard,
            double math, double phy, double chem, double eng, double urdu) {

        mathArr[times] = math;
        phyArr[times] = phy;
        chemArr[times] = chem;
        engArr[times] = eng;
        urduArr[times] = urdu;
        nameArr[times] = name;
        standardArr[times] = standard;

        int index = times;
        times++;

        return buildTranscript(index);
    }

    // For ListView
    public static String[] getStudentNames() {
        String[] arr = new String[times];
        for (int i = 0; i < times; i++) {
            arr[i] = nameArr[i];
        }
        return arr;
    }

    // For FX transcript display
    public static String getStudentTranscript(String name) {
        for (int i = 0; i < times; i++) {
            if (nameArr[i].equalsIgnoreCase(name)) {
                return buildTranscript(i);
            }
        }
        return "Student not found!";
    }
}