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();

        //write your code here......
        String result = "";
        switch (grade) {
            case "A":
                result = "优秀";
                break;
            case "B":
                result = "良好";
                break;
            case "C":
                result = "及格";
                break;
            case "D":
                result = "不及格";
                break;
            default:
                result = "未知等级";
        }
        System.out.println(result);
    }
}