面向对象练习1

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication40
{
    class Program
    {
        struct student
        {
            public string xueshengname;
            public int xuehao;
            public int fenshu;
        }
        public ArrayList paixu(ArrayList al)
        {
            for (int i = 0; i < al.Count; i++)
            {
                for (int j = i; j < al.Count - 1; j++)
                {
                    if (((student)al[i]).fenshu < ((student)al[j + 1]).fenshu)
                    {
                        student temp = (student)al[i];
                        al[i] = al[j + 1];
                        al[j + 1] = temp;
                    }
                }
            }
            return al;

        }
        static void Main(string[] args)
        {
            ArrayList al = new ArrayList();
            student a = new student();
            Console.WriteLine("请输入人数");
            int n = Convert.ToInt32(Console.ReadLine());
            for (int i = 0; i < n; i++)
            {
                Console.WriteLine("请输入第"+(i+1)+"人的姓名");
                a.xueshengname = Console.ReadLine();
                Console.WriteLine("请输入第" + (i + 1) + "人的学号");
                a.xuehao = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("请输入第" + (i + 1) + "人的成绩");
                a.fenshu = Convert.ToInt32(Console.ReadLine());
                al.Add(a);
            }
            new Program().paixu(al);
            for (int i = 0; i < n; i++)
            {
                Console.WriteLine((((student)al[i]).xueshengname) + "\t" + (((student)al[i]).xuehao) + "\t" + (((student)al[i]).fenshu));
            }
            Console.ReadLine();
        }
    }
}