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1. import java.util.Scanner;

class Student { int c; // Number of students int std_id[] = new int[10]; String name[] = new String[10];

void getData(Scanner sc) {
    System.out.print("Enter total number of students: ");
    c = sc.nextInt();
    sc.nextLine(); // Consume leftover newline

    for (int i = 0; i < c; i++) {
        System.out.print("Student " + (i + 1) + " ID: ");
        std_id[i] = sc.nextInt();
        sc.nextLine(); // Consume newline before reading name

        System.out.print("Student " + (i + 1) + " Name: ");
        name[i] = sc.nextLine();
    }
}

}

class StudentExam extends Student { int m1[] = new int[10]; int m2[] = new int[10]; int m3[] = new int[10]; int total[] = new int[10];

void getMarks(Scanner sc) {
    System.out.println("\nEnter marks for each student:");

    for (int i = 0; i < c; i++) {
        System.out.println("Marks for Student " + (i + 1) + " (" + name[i] + "):");

        System.out.print("Subject 1: ");
        m1[i] = sc.nextInt();

        System.out.print("Subject 2: ");
        m2[i] = sc.nextInt();

        System.out.print("Subject 3: ");
        m3[i] = sc.nextInt();

        total[i] = m1[i] + m2[i] + m3[i]; // Calculate total marks
    }
}

}

class StudentResult extends StudentExam { float per[] = new float[10]; char grade[] = new char[10];

void calculate() {
    if (c <= 0) return; // Prevents calculation if no students exist

    for (int i = 0; i < c; i++) {
        per[i] = total[i] / 3.0f;  // Float division

        // Assign grades based on percentage
        if (per[i] >= 90)
            grade[i] = 'A';
        else if (per[i] >= 75)
            grade[i] = 'B';
        else if (per[i] >= 60)
            grade[i] = 'C';
        else if (per[i] >= 45)
            grade[i] = 'D';
        else
            grade[i] = 'E';
    }
}

void display() {
    if (c <= 0) {
        System.out.println("No student data available.");
        return;
    }

    System.out.println("\nStudent Information:");
    System.out.println("------------------------------------------------------------------");
    System.out.printf("%-8s %-15s %-7s %-7s %-7s %-7s %-10s %-6s\n",
                      "ID", "Name", "Mark1", "Mark2", "Mark3", "Total", "Percentage", "Grade");
    System.out.println("------------------------------------------------------------------");

    for (int i = 0; i < c; i++) {
        System.out.printf("%-8d %-15s %-7d %-7d %-7d %-7d %-10.2f %-6c\n",
                          std_id[i], name[i], m1[i], m2[i], m3[i], total[i], per[i], grade[i]);
    }
}

}

public class Labb2 { public static void main(String args[]) { Scanner sc = new Scanner(System.in);

    StudentResult sr = new StudentResult();
    sr.getData(sc);
    sr.getMarks(sc);
    sr.calculate();
    sr.display();

    sc.close(); // Close Scanner
}

}

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