分数分类(java课本-实验)

import java.util.*;
public class fenshu {


	public static void main(String[] args) {
		
		Scanner scan=new Scanner(System.in);
		
		int score;
		
		char de;
		
		score=scan.nextInt();
		
		switch(score/10)
		{
		case 10:   
		case 9:de='A';            break;
	
		case 8:de='A';    switch(score%10)
			{
			case 10:   
			case 9:           break;
			case 8:           break;
			case 7:           break;
			case 6:           break;
			case 5: de='A';   break;
			
			default:de='B';
			
			}
		
		break;
		
		
		case 7:de='B';     break;	
		
		case 6:de='C';     break;

		
		
		default:de='D'; 
		}
		
		
		System.out.println("等级为："+de);


	}

}