结构化分析

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

namespace 学生信息
{
    class Program
    {
        public struct student//创建一个结构体，每一个学生的三个信息
        {
            public string name;
            public int code;
            public int degree;
        }
        /// <summary>
        /// 冒泡排序
        /// </summary>
        /// <param name="a"></param>
        /// <returns>输入参数ArrayList a</returns>
        public ArrayList paixu(ArrayList a) 
        {
            student b = new student();//创建临时结构体，用于当做中间值
            for (int i = 0; i <a.Count; i++)
            {
                for (int j = i; j <a.Count-1; j++)
                {
                    if (((student)a[i]).degree < ((student)a[j + 1]).degree)//强制转换成结构体类型，取分数用于比较大小
                    {
                        b = ((student)a[i]);//中间值，互换集合中位置
                        a[i] = a[j + 1];
                        a[j + 1] = b;
                    }
                }
            }
            return a;
        }
        static void Main(string[] args)
        {
            student p = new student();
            ArrayList s = new ArrayList();
            Console.WriteLine("请输入学生人数：");
            int a = Convert.ToInt32(Console.ReadLine());
            for (int i = 0; i <a; i++)
            {
                Console.WriteLine("请输入学生姓名：");
                string b1 = Console.ReadLine();
                p.name = b1;
                Console.WriteLine("请输入学号：");
                int b2 = Convert.ToInt32(Console.ReadLine());
                p.code = b2;
                Console.WriteLine("请输入分数：");
                int b3 = Convert.ToInt32(Console.ReadLine());
                p.degree = b3;
                s.Add(p);//存于集合中
            }
            double sum = 0;
            for (int i = 0; i < a; i++)
            {
                sum = sum + ((student)s[i]).degree;
            }
            double avg = sum / a;
            Console.WriteLine("平均分数为："+avg);
            new Program().paixu(s);//调用函数，排序
            for (int i = 0; i < a; i++)//排完序，遍历集合
            {
                Console.WriteLine("姓名："+((student)s[i]).name+"  学号："+((student)s[i]).code+"  分数："+((student)s[i]).degree);
            }
            Console.ReadLine();
        }
    }
}