machine.h

一个自动售货机的模拟

class VendingMachine

{

public:

   /*

      Constructs a vending machine with no current

      product selection.

   */

   VendingMachine();

   /*

      Adds product to the machine.

      @param p the product to add

   */

   void add_product(Product p);

   /*

      Sets the currently selected product

      @param name the product name

      @return true if the machine has a product with the given

      name

   */

   bool select_product(string name);

   void chaxun_product();//查询当前售货机内的商品

   /*

      Adds a coin to pay for the currently selected product.

      @param c the coin to add

      @return true if sufficient coins have been added to pay

      for the selected product.

   */

   bool add_coin(vector<Coin> current_pay);

   /*

      Removes all coins that were added to pay for the current

      product.

      @return the value of the returned coins

   */

   double return_coins();

   /*

      Removes all money that was paid for products.

      @return the value of the money

   */

   double remove_money();

double add_coinbijiao(vector<Coin> current_pay );//对投入的金钱和所购买的商品的价格进行比较

double return_yiyoucoins();//统计售货机中已有的货款

void setcurrent_product();//把当前选择的商品代号置为-1

int getcurrent_product();//得到当前选择的商品代号

private:

   vector<Product> products;

   int current_product;

   vector<Coin> current_payment;

   vector<Coin> coins;

};

 

VendingMachine::VendingMachine()

{

   current_product = -1;

}

 

void VendingMachine::add_product(Product p)//添加商品

{

   for (int i = 0; i < products.size(); i++)

   {

      if (products[i].get_name() == p.get_name() && products[i].get_price() == p.get_price())

      {

         products[i].add_quantity(p.get_quantity());

               cout<<"添加成功！"<<endl;

         return;

      }

         else if(products[i].get_name() == p.get_name() && products[i].get_price() != p.get_price())

         {

                cout<<"已存在该商品，与您输入的价格不同！"<<endl;

                return;

         }

   }

   products.push_back(p);

   cout<<"添加成功！"<<endl;

}

 

bool VendingMachine::select_product(string name)//选择商品

{   

              int i;

              for ( i = 0;  i < products.size(); i++)

              {

                     if (products[i].get_name() == name && products[i].get_quantity() > 0)

                     {

                            current_product = i;

                            return true;

                     }

                     else

                     {

                            if(products[i].get_name() == name && products[i].get_quantity() == 0)

                            {

                                   cout << "对不起，该商品已售完！\n";

                                   return false;

                            }

                     }

              }

              if(i==products.size())

              {

                     cout<<"对不起，不存在该商品！"<<endl;

                     return false;

              }

}

 

double VendingMachine::return_yiyoucoins()//统计售货机当前的金钱总额

{

   double total = 0;

   for (int i = coins.size() - 1; i >= 0; i--)

   {

      total = total + coins[i].get_value();

   }

   return total;

}

 

bool VendingMachine::add_coin(vector<Coin> current_pay )//投币购买商品

{

       if (current_product == -1) return false;

              for(int k=0;k < current_pay.size(); k++)

              {

                     current_payment.push_back(current_pay[k]);

              }

              double total = 0;

              for (int i = 0; i < current_payment.size(); i++)//计算投入的总钱数

              {

                     total = total + current_payment[i].get_value();

              }

              if (total >= products[current_product].get_price())//投入的钱数与所购商品的价格比较

              {

                     for (int i = current_payment.size() - 1; i >= 0; i--)

                     {

                            coins.push_back(current_payment[i]);

                            current_payment.pop_back();

                     }

                     products[current_product].add_quantity(-1);

                     current_product = -1;

                     cout<<"交易成功！"<<endl;

                     return true;

              }

              else 

              {

                     return false;

              }

}

 

double VendingMachine::add_coinbijiao(vector<Coin> current_pay )

{

       if (current_product == -1) return false;

       double total = 0;

       for(int k=0;k < current_pay.size(); k++)

       {

              total = total + current_pay[k].get_value();

 

       }

   double m=products[current_product].get_price()-total;

   if (m>0)

              return m;

   else

          return -1;

}

 

 

 

double VendingMachine::return_coins()//统计当前投入的金钱总额

{

   double total = 0;

   for (int i = current_payment.size() - 1; i >= 0; i--)

   {

      total = total + current_payment[i].get_value();

      current_payment.pop_back();

   }

   return total;

}

 

 

 

double VendingMachine::remove_money()//取钱

{

   double total = 0;

   for (int i = coins.size() - 1; i >= 0; i--)

   {

      total = total + coins[i].get_value();

      coins.pop_back();

   }

   return total;

}

 

void VendingMachine::chaxun_product()

{ 

       if(products.size()==0)

       {

              cout<<"暂时没有添加商品!"<<endl;

       }

       else

       {

              cout<<"商品名"<<"\t\t"<<"价格"<<"\t\t"<<"数量"<<endl;

              for (int i = 0; i < products.size(); i++)

              {

                     cout<<products[i].get_name()<<"\t\t"<<products[i].get_price()<<"\t\t"<<products[i].get_quantity()<<endl;

              }

       }

}

 

void VendingMachine::setcurrent_product()

{

       current_product=-1;

}

 

int VendingMachine::getcurrent_product()

{

       return current_product;

}