Java

public class Daily_Test {
    public static void main(String[] args) {
        java.util.Scanner s = new java.util.Scanner(System.in);
        System.out.println("请输入学生成绩：");
        double score = s.nextDouble();
        if(score<0||score>100)
        {
            System.out.println("您输入的成绩不合法！");
            return;
        }
        int grade = (int)(score/10);
        String str ="不及格";
        switch (grade){
            case 10: case 9:
                str = "优";
                break;
            case 8:
                str = "良";
                break;
            case 7:
                str = "中";
                break;
            case 6:
                str = "及格";
                break;
            default:
                break;
        }
        System.out.println("该学生的成绩等级为："+str);


    }
}