using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Text.RegularExpressions;

namespace c编程练习题

{

    class Program

    {

       public  struct student               //结构体的用法。

       {

          public int code;

          public string name;

          public int old;

         }

 static void Main(string[] args)

        {

                Console.WriteLine("请输入学生的人数");

                int count = int.Parse(Console.ReadLine());

                ArrayList arr=new ArrayList();

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

                {

                    student s = new student();

                    Console.WriteLine("学号：");

                    s.code = int.Parse(Console.ReadLine());

                    Console.WriteLine("姓名：");

                    s.name = Console.ReadLine();

                    Console.WriteLine("年龄：");

                    s.old = int.Parse(Console.ReadLine());

                    arr.Add(s);

                }

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

                {

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

                    {

                        if (((student)arr[i]).old<((student)arr[j]).old)

                        {

                            student temp = (student)arr[i];

                           arr[i] = arr[j];

                           arr[j] = temp;

                        }

                    }

                }

                Console.WriteLine("学号     姓名      年龄    从大到小依次排列");

                foreach (student s in arr)

                {

                    Console.Write("{0}     {1}      {2}\n",s.code,s.name,s.old);

                }

                Console.ReadLine();

        }

    }

}