switch语句输出百分制的分数段

import java.util.Scanner;public class Grade{public static void main(String args[]){Scanner sc=new Scanner(System.in);int grade=sc.nextInt();int a;a=grade/10;switch(a){case 0:case 1:case 2:case 3:case 4:case 5:System.out.println("d!");break;case 6:System.out.println("c!");break;case 7:System.out.println("b!");break;case 8:if(grade%10<5) {System.out.println("b");break;}else {System.out.println("a");break;}case 9:case 10:System.out.println("a");break;}}}