商店货物管理系统

      商店经销一种货物，货物成箱购进，成箱卖出，购进和卖出时以重量为单位，各箱的重量不一样，单价不一样，因此商店需要记录下目前库存的货物的总重量和总价值。编写一个程序，通过定义类Carlo来模拟商店货物购进和卖出的情况。

//Menu.h

#ifndef MENU_H

#define MENU_H

class Menu

{public:

int show();

};

#endif;

// Carlo.h

class Carlo

{public:

 Carlo(double Weight = 0,double Price = 0);

virtual         ~Carlo();

  void            SetCarlo(double = 0,double = 0);

const double    &GetCurrentTotalWeight() const;

const double    &GetCurrentTotalPrice() const; 

void            BuyBox();

void            SellBox();

void            ShowBoxInfor() const;

protected:            

static  double  TotalWeight;

static  double  TotalPrice;      

private:

double  BoxWeight;

double  BoxPrice;

};

//Carlo.cpp

#include <iostream>

#include "Carlo.h"

using namespace std;

double Carlo::TotalPrice=0.0;

double Carlo::TotalWeight=0.0;

Carlo::Carlo(double Weight, double Price)

{    BoxWeight = Weight;

     BoxPrice  = Price;

     TotalPrice += Weight * Price;

     TotalWeight += Weight;

}

void Carlo::BuyBox()

{    system("cls");

     Carlo carlo;

     double Weight , Price;

     cout<<"请输入进货的重量和价格:";

     cin>>Weight>>Price;

     carlo.SetCarlo(Weight,Price); 

}

const double &Carlo::GetCurrentTotalPrice() const

{       return TotalPrice;         

}

const double &Carlo::GetCurrentTotalWeight() const

{        return TotalWeight;

}

void Carlo::SetCarlo(double Weight, double Price)

{    BoxWeight = Weight;

     BoxPrice  = Price;

     TotalPrice += Weight * Price;

     TotalWeight += Weight;

}

void Carlo::SellBox()

{ system("cls");

  double Weight,Price;

  cout<<"输入出货的重量和单价:";

  cin>>Weight>>Price;

 while (Weight < 0 || Price < 0)

  {  cout<<"参数不对,请重新输入:";

     cin>>Weight>>Price;

 }

 if ((Weight * Price > TotalPrice) || Weight > TotalWeight

|| TotalPrice < 0)

 {cout<<"存货不够!";

  cin.get();

  cin.get();

 }

    else

 { TotalPrice -= Weight * Price;

   TotalWeight -= Weight;

   cout<<"出货完成!";

   cin.get();

   cin.get();

 }

}

void Carlo::ShowBoxInfor() const

{system("cls");

 cout<<"库中的存货总重量为:";

 cout.precision(6);

 cout.setf(ios_base::showpoint);

 cout<<GetCurrentTotalWeight()<<endl;

 cout<<"库中的存货总价钱为:";

 cout.precision(6);

 cout<<GetCurrentTotalPrice();

 cin.get();

 cin.get();

}

Carlo::~Carlo()

{

}

//Menu.cpp

#include <iostream>

#include <windows.h>

#include "Menu.h"

using namespace std;

int Menu::show()

{       system("cls");

int chioce;

cout<<"/n/n/n/n/n/t/t/t"<<"/>/>/>";

cout<<"进出货演示"<<"/</</<"<<endl<<endl;

cout<<"/t/t/t"<<"1.进货登记."<<endl<<endl;

cout<<"/t/t/t"<<"2.出货登记."<<endl<<endl;

cout<<"/t/t/t"<<"3.获取库存信息."<<endl<<endl;

cout<<"/t/t/t"<<"4.退出."<<endl<<endl;

cout<<"/t/t/t"<<"请选择操作:";

cin>>chioce;

return (chioce);

}

//CarloDemo.cpp

#include <iostream>

#include "Menu.h"

#include "Carlo.h"

using namespace std;

void main()

{   Menu menu;

Carlo carlo;

    int chioce;

    while( (chioce = menu.show()) - 4)

{   switch(chioce)

{    case 1: carlo.BuyBox();

break;

case 2: carlo.SellBox();

             break;

case 3: carlo.ShowBoxInfor();

break;

}

}

}    

  运行结果：

1.进货登记.

   2.出货登记.

   3.获取库存信息."

4.退出.

请选择操作: 1

请输入进货的重量和价格:20 1

1.进货登记.

   2.出货登记.

   3.获取库存信息."

4.退出.

请选择操作: 2

请输入出货的重量和价格:10 1

出货成功！

1.进货登记.

   2.出货登记.

   3.获取库存信息."

4.退出.

请选择操作: 3

库中的存货总重量为:10，0000

库中的存货总价钱为:10，0000