老人家的舊書房

import java.io.*;

public class ex5_3{
public static void main(String[] argv)
throws IOException{

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("請輸入成績:");
String str = br.readLine();
int i = Integer.parseInt(str);
int j = i/10;
switch(j){
case 10:
System.out.println("A等");
break;
case 9:
System.out.println("A等");
break;
case 8:
System.out.println("B等");
break;
case 7:
System.out.println("C等");
break;
case 6:
System.out.println("D等");
break;
default:
System.out.println("E等");
break;
}
}
}