import java.util.Scanner;

public class Score 
{
    public static void main(String[] args)

     {
        Scanner sc = new Scanner(System.in);

        System.out.print("请输入学生人数:");
        int length = sc.nextInt();
          //创建数组储存学生的成绩，数组还没学的话，尽快学习吧。

        int[] scores = new int[length];

        System.out.println("成绩对应的等级为:");
            {
            String level;
            if (scores[i] >= 90) {
                level = 'A';
            } else if (scores[i] >=80 ) {
                level = 'B';
            } else if (scores[i] >= 70) {
                level = 'C';
            } else if (scores[i]>=60){
                level = 'D';
            }else{
            level ='不及格'}

            System.out.println("学生["+i+"] 成绩为： is "+scores[i]+" 等级为： is "+level);
        }

    }
}