银行收银系统（C#）



思路：  分三大块    一部分是显示出来的商品   一部分是用来存储商品的仓库  一部分是销售商品的 平台     仓库是分门别类的放置商品的  应该先给仓库添加货架

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

namespace 收银系统
{
    class Acer : ProductFather
    {
        public Acer(String name,decimal price,  string id) : base(name,price,id)
        {

        }
    }
}

----------------------------------------------------------------------------------------------------------------------------------------------------

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

namespace 收银系统
{
    class Banana:ProductFather
    {
        public Banana(String name, decimal price,  string id) : base(name, price,  id)
        {

        }
    }
}

------------------------------------------------------------------------------------------------------------------------------------------------------

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

namespace 收银系统
{
    /// <summary>
    /// 折扣
    /// </summary>
   abstract  class Discount
    {
        /// <summary>
        /// 折扣的抽象函数
        /// </summary>
        /// <param name="money">本应该付多少钱</param>
        /// <returns>返回打折后应付的钱</returns>
        public abstract decimal DiscountMethod(decimal money);
    }
}
--------------------------------------------------------------------------------------------------------------------------------------------------------

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

namespace 收银系统
{
    /// <summary>
    ///按打折率打折的类，继承打折类
    /// </summary>
    class discountRate : Discount
    {
        //用自动属性存储打折率
        public double Rate
        {
            get;
            set;
        }
        //把打折率通过构造函数传进来
        public discountRate(double rate)
        {
            this.Rate = rate;
        }

        /// <summary>
        /// 重写打折的构造函数
        /// </summary>
        /// <param name="money">打折之前应该付多少钱</param>
        /// <returns>返回打折后应付的钱</returns>
        public override decimal DiscountMethod(decimal money)
        {
            return money * (decimal)this.Rate;
        }

    }
}
---------------------------------------------------------------------------------------------------------------------------------------------------------

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

namespace 收银系统
{
    class Enough : Discount
    {
        //定义自动属性存储买了多少钱
        public decimal Buy
        {
            get;
            set;
        }

        //定义自动属性存储应该少多少钱
        public decimal Sell
        {
            get;
            set;
        }

        //通过构造函数把买了多少钱，应该减多少钱传进去
        public Enough(decimal buy,decimal sell)
        { <