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 = 1; i <= 3;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 = 0; i < al.Count;i++ )            {                for (int j = i + 1; j < al.Count;j++ )                {                    student a = (student)al[i];                    student b=(student)al[j];                    if(a.score

上午，忙了半天统计排名，在网上发现这条方法的好处，于是转发引用一下

转自：http://www.cnblogs.com/fengsantianya/p/5592686.html