题解 | 判断学生成绩等级

import java.util.Scanner;

public class Main 
{
    public static void main(String[] args) 
    {
        Scanner input=new Scanner(System.in);
        char k=input.next().charAt(0);
        if(k=='A')
        System.out.println("优秀");
        else if(k=='B')
        System.out.println("良好");
        else if(k=='C')
        System.out.println("及格");
        else if(k=='D')
        System.out.println("不及格");
        else
        System.out.println("未知等级");
        

    }
}