using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Collections;

namespace ConsoleApplication3

{

    class Program

    {

        struct student

        {

            public string sno;

            public string name;

            public double score;

        }

        static void Main(string[] args)

        {

            //1、循环添加学生信息

            ArrayList al = new ArrayList();

            for (int i = ; i <= ;i++ )

            {

                student st = new student();

                Console.Write("请输入学生编号：");

                st.sno = Console.ReadLine();

                Console.Write("请输入学生姓名：");

                st.name = Console.ReadLine();

                Console.Write("请输入学生分数：");

                st.score = double.Parse(Console.ReadLine());

                al.Add(st);

                Console.WriteLine("-------------------------");

            }

            //打印

            Console.WriteLine("按照成绩表打印");

            foreach(object o in al)

            {

                student x = (student)o;

                Console.WriteLine(x.sno+"\t"+x.name+"\t"+x.score);

            }

            //2、排序

            for (int i = ; i < al.Count;i++ )

            {

                for (int j = i + ; j < al.Count;j++ )

                {

                    student a = (student)al[i];

                    student b=(student)al[j];

                    if(a.score<b.score)

                    {

                        object zhong=al[i];

                        al[i]=al[j];

                        al[j] = zhong;

                    }

                }

            }

            //3、打印

            Console.WriteLine("==================================================");

            Console.WriteLine("按照成绩从大到小排列");

            foreach(object ob in al)

            {

                student o = (student)ob;

                Console.WriteLine(o.sno+"\t"+o.name+"\t"+o.score);

            }

            Console.ReadLine();

        }

    }

}