题解 | #判断学生成绩等级#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String grade =scanner.next();

        switch(grade){
            case "A" :
                System.out.print("优秀");
                break;
            case "B" :
                System.out.print("良好");
                break;
            case "C" :
                System.out.print("及格");
                break;
            case "D" :
                System.out.print("不及格");
                break;
            default:
                System.out.print("未知等级");
                break;
        }

    }
}