class Program
        {
                static void Main(string[] args)
                {
                        ABC abc = new ABC();

                        //老师修改及格线部分
                        Console.WriteLine("本次考试及格成绩线为：{0}分。请输入修改后的及格线：", abc.I.ToString());
                        abc.I = int.Parse(Console.ReadLine());
                        Console.WriteLine("修改成功，目前考试及格成绩线为：{0}分。", abc.I.ToString());

                        //学生查成绩部分
                        Console.WriteLine("本次考试及格成绩线为：{0}分。请输入你的成绩", abc.I.ToString());
                        int x = int.Parse(Console.ReadLine());
                        abc.chachengji(x);

                }
        }

        //定义成绩线及查询的类
        class ABC
        {
                int i=72;

                public int I
                {
                        get { return i; }
                        set { i = value; }
                }
                public void chachengji(int j)
                {
                        if (j >= i)
                        {
                                Console.WriteLine("你及格了！");
                        }
                        else
                        {
                                Console.WriteLine("不及格！");
                        };
                }
        }

                public int I
                {
                        get { return i; }
                        set { i = value; }
                }

                public void chachengji(int j)
                {
                        if (j >= i)
                        {
                                Console.WriteLine("你及格了！");
                        }
                        else
                        {
                                Console.WriteLine("不及格！");
                        };
                }