StudentGradeTracker.java

import java.util.Scanner;

class Student {
    String name;
    int marks;

    Student(String name, int marks) {
        this.name = name;
        this.marks = marks;
    }

    String getGrade() {
        if (marks >= 90) return "A";
        if (marks >= 80) return "B";
        if (marks >= 70) return "C";
        if (marks >= 60) return "D";
        if (marks >= 50) return "E";
        return "F";
    }
}

public class StudentGradeTracker {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.print("Enter number of students: ");
        int n = sc.nextInt();
        sc.nextLine();

        if (n <= 0) {
            System.out.println("Number of students must be greater than 0.");
            sc.close();
            return;
        }

        Student[] students = new Student[n];
        int total = 0;
        int highest = -1;
        int lowest = 101;

        for (int i = 0; i < n; i++) {

            System.out.print("\nEnter name of Student " + (i + 1) + ": ");
            String name = sc.nextLine();

            int marks;

            while (true) {
                System.out.print("Enter marks (0-100): ");
                marks = sc.nextInt();

                if (marks >= 0 && marks <= 100) {
                    break;
                }

                System.out.println("Invalid marks. Please enter a value between 0 and 100.");
            }

            sc.nextLine();

            students[i] = new Student(name, marks);

            total += marks;

            if (marks > highest)
                highest = marks;

            if (marks < lowest)
                lowest = marks;
        }

        System.out.println("\n========== STUDENT REPORT ==========");

        for (Student student : students) {
            System.out.println(
                student.name + " | Marks: " + student.marks +
                " | Grade: " + student.getGrade()
            );
        }

        double average = (double) total / n;

        System.out.println("\nAverage Marks : " + average);
        System.out.println("Highest Marks : " + highest);
        System.out.println("Lowest Marks  : " + lowest);

        System.out.println("====================================");

        sc.close();
    }
}