자바 성적 입력

import java.util.InputMismatchException;
import java.util.Scanner;
public class s4 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int score = 0x0;
        System.out.print("Score input:  ");
        try {
            score = input.nextInt(); // 입력한 값이 숫자니?
            if (score > 100 || score < 0) {
                System.out.println("score error ... !!!");
            }
            else {
                // score <= 100 and score >= 0
                switch (score/10) {
                    case 10: System.out.println("A+"); break;
                    case 9: System.out.println("A"); break;
                    case 8: System.out.println("B+"); break;
                    case 7: System.out.println("B"); break;
                    default:System.out.println("Ooops F... !!!"); break;
                }
            }
        } catch (InputMismatchException E) {
            System.out.println(E);
        }
    }
}