My Life Goes By My Style

import java.io.*;
public class test08{
public static void main(String[] args)throws IOException
{

BufferedReader input = new BufferedReader
(new InputStreamReader(System.in));
int score;
char grade;
System.out.print("請輸入分數 : ");
score = Integer.parseInt(input.readLine());
score = score/10;
switch(score)
{
case 10 : grade = 'A'; break;
case 9 : grade = 'A'; break;
case 8 : grade = 'A'; break;
case 7 : grade = 'B'; break;
case 6 : grade = 'C'; break;
default : grade = 'D';
}
System.out.println("這是屬於 "+grade+" 級的成績");
}
}