用结构体求平均分

struct Student
        {
           public string name;
           public int age;
           public double Cshap;
           public double Database;
           public double Html;
           public double sum;
        }

        static void Main(string[] args)
        {
            Console.WriteLine("请输入学生的个数：");
            int a = Convert.ToInt32(Console.ReadLine());

            List<Student> list = new List<Student>();

            for (int i = 0; i < a; i++)
            {
                Student s = new Student();

                Console.WriteLine("请输入第{0}个学生的姓名：",i+1);
                s.name = Console.ReadLine();

                Console.WriteLine("请输入第{0}个学生的年龄：", i + 1);
                s.age = Convert.ToInt32(Console.ReadLine());

                Console.WriteLine("请输入第{0}个学生的Cshap成绩：", i + 1);
                s.Cshap = Convert.ToDouble(Console.ReadLine());

                Console.WriteLine("请输入第{0}个学生的数据库成绩：", i + 1);
                s.Database = Convert.ToDouble(Console.ReadLine());

                Console.WriteLine("请输入第{0}个学生的网页成绩：", i + 1);
                s.Html = Convert.ToDouble(Console.ReadLine());

                s.sum = s.Cshap + s.Database + s.Html;

                list.Add(s);
            }

            //排序
            for (int i = 0; i < list.Count-1; i++)
            {
                for (int j = 0; j < list.Count - 1 - i; j++)
                {
                    if (list[j].sum <= list[j + 1].sum)
                    {
                        Student zj = list[j];
                        list[j] = list[j + 1];
                        list[j + 1] = zj;
                    }
                }
            }
            //输出

            Console.WriteLine("姓名\t年龄\tCshap\t数据库\t网页\t总分");
            foreach (Student data in list)
            {
                Console.WriteLine(data.name+"\t"+data.age+"\t"+data.Cshap+"\t"+data.Database+"\t"+data.Html+"\t"+data.sum);
            }