using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Student
    {
        public string name; //欄位  名字
        public int age;     //欄位  年齡
        public int _class;  //欄位  班級
        public long number; //欄位  學號

        public Student()    //構造方法一
        {
            this.name = "漲三";   //賦預設值
            this.age = 11;
            this._class = 2017;
            this.number = 0000;

        }
        public Student(string F2Name, int F2Age, int F2_class, long F2Number)   //構造方法二
        {
            this.name = F2Name;     //實參賦值給相應欄位
            this.age = F2Age;
            this._class = F2_class;
            this.number = F2Number;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            long sum = 0;
            const int SIZE = 5;
            Student[] a = new Student[SIZE];    //類陣列
            for (int i = 0; i < SIZE; i++)
            {
                a[i] = new Student();       //陣列宣告
                Console.WriteLine("第{0}次輸入資料：\n名字", i + 1);
                a[i].name=Console.ReadLine();       //陣列例項化
                Console.WriteLine("年齡");
                a[i].age= int.Parse(Console.ReadLine());
                Console.WriteLine("班級");
                a[i]._class= int.Parse(Console.ReadLine());
                Console.WriteLine("學號");
                a[i].number= long.Parse(Console.ReadLine());

                Student c = new Student(a[i].name, a[i].age, a[i]._class, a[i].number);
            }
            for (int i=0;i<SIZE;i++)
            {
                sum += a[i].age;    //呼叫10個不同物件的age
            }
            Console.WriteLine(sum/SIZE);
            Console.Read();
        }
    }
}
 

c#課堂作業：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace work
{
    public class WaiMai
    {
        private long number;
        public long Number      //號碼
        {
            get { return number; }
            set { number = value; }
        }
        private string name;    //姓名
        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        private string address; //地址
        public string Address
        {
            get { return address; }
            set { address = value; }
        }
        public WaiMai() { }
        public WaiMai(long number)     //自定義構造方法
        {
            this.number = number;
        }
        public WaiMai(string name, string adress)
        {
            this.name = name;
            this.address = address;
        }
        public WaiMai(long number, string name, string address)
        {
            this.number = number;
            this.name = name;
            this.address = address;
        }
        public void show(long number)   //普通方法
        {
            Console.WriteLine("電話：" + number);
        }
        public void show(string name, string address)
        {
            Console.WriteLine("姓名：" + name + "\n地址:" + address);
        }
        public void show(long number, string name, string address)
        {
            Console.WriteLine("電話：{0}\n姓名:{1}\n地址：{2}", number, name, address);
        }

    }
    public class WaiMai2:WaiMai     //派生類
    {
        private long ordernumber;    //訂單號
        public long Ordernumber
        {
            get { return ordernumber; }
            set { ordernumber = value; }
        }

         new public long Number=13320180000; //成員隱藏

        new public void show(long ordernumber,string name,string address)       //派生類show方法重寫
        {
            Console.WriteLine("訂單號:{0}\n姓名: {1}\n電話："+Number+" \n地址：{2}",ordernumber, name, address);
        }
        public WaiMai2() { }
        public WaiMai2(long number, string name, string address) : base(number, name, address)  //子類呼叫父類構造方法
        {
            Console.WriteLine("\n\n子類呼叫父類構造方法\n電話：{0}\n姓名:{1}\n地址：{2}", Number, Name, Address);
        }
 
    }
    public class price      //靜態類
    {
        public static int giveprice=2;  //靜態欄位  配送價格

        public static void pricemain(int p)              //靜態方法   引數為外賣價格
        {
            p = giveprice + p;
            Console.WriteLine("價格：{0}元(含配送{1}元)",p,giveprice);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("訂單一:\n");
            WaiMai w1 = new WaiMai();
            w1.Number = 18888888888;
            w1.Name = "張三";
            w1.Address = "重慶電子工程職業學院";
            w1.show(w1.Number);
            w1.show(w1.Name,w1.Address);
            price.pricemain(13);

            Console.WriteLine("\n訂單二:\n");

            WaiMai w2 = new WaiMai();
            w2.Number = 13300000000;
            w2.Name = "李四";
            w2.Address = "電子校";
            w2.show(w2.Number,w2.Name,w2.Address);
            price.pricemain(8);

            Console.WriteLine("\n\n訂單三（派生類）：\n");
            WaiMai2 w4 = new WaiMai2();
            w4.Ordernumber = 201080000;
            w4.show(w4.Ordernumber,"吳名","重慶電子校北區");

            WaiMai2 w3 = new WaiMai2(18855555555, "李五", "重慶電子校南區");
          //  Console.WriteLine("\n\n電話：{0}\n姓名:{1}\n地址：{2}", w3.Number, w3.Name, w3.Address);

            Console.Read();
        }
    }
}