1 /* 2   * 策略模式 3   */ 4  5 #include <iostream> 6 #include <cmath> 7 #include <string> 8 using namespace std; 9 10 class CashSuper11 {12 public:13     virtual double acceptMoney(double money) = 0;14 };15 16 class CashNormal : public CashSuper17 {18 public:19     double acceptMoney(double money)20     {21         return money;22     }23 };24 25 class CashRebate : public CashSuper26 {27 private:28     double discount;29 30 public:31     CashRebate(double dis)32     {33         discount = dis;34     }35     double acceptMoney(double money)36     {37         return money * discount;38     }39 };40 41 42 class CashReturn : public CashSuper43 {44 private:45     double moneyCondition;46     double moneyReturn;47 48 public:49     CashReturn(double mc, double mr)50     {51         moneyCondition = mc;52         moneyReturn = mr;53     }54     double acceptMoney(double money)55     {56         double result = money;57         if (money >= moneyCondition)58         {59             result = money - floor(money / moneyCondition) * moneyReturn;60         }61         return result;62     }63 };64 65 class  CashContext66 {67 private:68     CashSuper *cs;69 public:70     CashContext(CashSuper *cs)71     {72         this->cs = cs;73     }74     double getResult(double money)75     {76         return cs->acceptMoney(money);77     }78 };79 80 void main()81 {82     CashSuper *cs;83     CashContext *cc;84     double money = 1000;85 86     cs = new CashRebate(0.8);87     cc = new CashContext(cs);88     cout << cc->getResult(money) << endl;89 90     money = 1000;91     cs = new CashNormal();92     cc = new CashContext(cs);93     cout << cc->getResult(money) << endl;94 95 }

 1 /* 2   * 策略与工厂模式 3   */ 4 #include <iostream> 5 #include <cmath> 6 #include <string> 7 using namespace std; 8  9 class CashSuper10 {11 public:12     virtual double acceptMoney(double money) = 0;13 };14 15 class CashNormal : public CashSuper16 {17 public:18     double acceptMoney(double money)19     {20         return money;21     }22 };23 24 class CashRebate : public CashSuper25 {26 private:27     double discount;28 public:29     CashRebate(double dis)30     {31         discount = dis;32     }33     double acceptMoney(double money)34     {35         return money * discount;36     }37 };38 39 40 class CashReturn : public CashSuper41 {42 private:43     double moneyCondition;44     double moneyReturn;45 public:46     CashReturn(double mc, double mr)47     {48         moneyCondition = mc;49         moneyReturn = mr;50     }51     double acceptMoney(double money)52     {53         double result = money;54         if (money >= moneyCondition)55         {56             result = money - floor(money / moneyCondition) * moneyReturn;57         }58         return result;59     }60 };61 62 class  CashContext63 {64 private:65     CashSuper *cs;66 public:67     CashContext(string str)68     {69         if ("正常收费" == str)70         {71             cs = new CashNormal();72         }73         else if ("打9折" == str)74         {75             cs = new CashRebate(0.9);76         }77         else if ("满300送200" == str)78         {79             cs = new CashReturn(300, 200);80         }        81     }82     double getResult(double money)83     {84         return cs->acceptMoney(money);85     }86 };87 88 89 int main()90 {91     double money = 1000;92     CashContext *cc = new CashContext("打9折");93     cout << cc->getResult(money);94     return 0;95 }