1用switch语句从控制台输入100以内的分数判断优秀，良好，及格不及格属于哪一个区间

public static void main(String[] args) {

      System.out.println("请输入成绩");

      Scanner scanner=new Scanner(System.in);

      int num=scanner.nextInt();

           switch(num/10) {

           case 10:

                     System.out.println("满分");

                     break;

           case 9:

                     System.out.println("成绩为优秀");

                     break;

           case 8:

           case 7:

                     System.out.println("成绩为良好秀");

                     break;

           case 6:

                      System.out.println("成绩为及格秀");

                     break;

            case 0:

            case 1:

            case 2:

            case 3:

            case 4:

            case 5:

                      System.out.println("成绩为不及格");

                      break;

            default:

                      System.out.println("请输入有效成绩");

                      break;

            }

            scanner.close();

            }