1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5
  6 namespace ConsoleApplication1
  7 {
  8     enum Coupon
  9     {
 10         NoCoupon,
 11         Discount,
 12         ReturnM
 13     }
 14
 15     #region
 16
 17     abstract class CashSuper
 18     {
 19         public abstract double acceptCash(double money);
 20     }
 21
 22     class CashNormal: CashSuper
 23     {
 24         public override double acceptCash(double money)
 25         {
 26             return money;
 27         }
 28     }
 29
 30     class CashRebate: CashSuper
 31     {
 32         private double rebate = 1d;
 33
 34         public CashRebate(double rebate)
 35         {
 36             this.rebate = rebate;
 37         }
 38
 39         public override double acceptCash(double money)
 40         {
 41             return money * rebate;
 42         }
 43     }
 44
 45     class CashReturn : CashSuper
 46     {
 47         private double moneyCondition = 0.0;
 48         private double moneyReturn = 0.0d;
 49
 50         public CashReturn(double moneyCondition, double moneyReturn)
 51         {
 52             this.moneyCondition = moneyCondition;
 53             this.moneyReturn = moneyReturn;
 54         }
 55
 56         public override double acceptCash(double money)
 57         {
 58             double result = money;
 59
 60             if(money > moneyCondition)
 61             {
 62                 result = money - Math.Floor(money/moneyCondition) * moneyReturn;
 63             }
 64
 65             return result;
 66         }
 67     }
 68
 69     #endregion
 70
 71     #region Strategy Context
 72
 73     // Factory Pattern and Strategy Pattern
 74     class CashContext
 75     {
 76         private CashSuper cs = null;
 77
 78         public CashContext(Coupon cp)
 79         {
 80             switch(cp)
 81             {
 82                 case Coupon.NoCoupon:
 83                     cs = new CashNormal();
 84                     break;
 85                 case Coupon.Discount:
 86                     cs = new CashRebate(0.8);
 87                     break;
 88                 case Coupon.ReturnM:
 89                     cs = new CashReturn(300, 100);
 90                     break;
 91             }
 92         }
 93
 94         public double GetResult(double money)
 95         {
 96             return this.cs.acceptCash(money);
 97         }
 98     }
 99
100     #endregion
101
102     class Program
103     {
104         static void Main(string[] args)
105         {
106             CashContext cs = new CashContext(Coupon.Discount);
107             double d1 = cs.GetResult(500);
108
109             cs = new CashContext(Coupon.ReturnM);
110             double d2 = cs.GetResult(700);
111
112             Console.ReadLine();
113         }
114     }
115 }