JAVA_Switch Case

import java.util.Scanner;


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

        System.out.println("Enter Mark: ");
        mark = scanner.nextInt();
        String s = "----   +++";


        switch (mark / 10) {
        case 9:
            System.out.print("Grade : A"+s.charAt(mark%10));
            break;
        case 8:
            System.out.print("Grade : B"+s.charAt(mark%10));
            break;
        case 7:
            System.out.print("Grade : C"+s.charAt(mark%10));
            break;
        case 6:
            System.out.print("Grade : D"+s.charAt(mark%10));
            break;
        default:
            System.out.println("Grade : F "+s.charAt(mark%10));
            break;
        }
    }
}