C++影碟租赁管理系统：面向对象编程实例

#include <iostream>
#include <fstream>
#include <iomanip>
#include<string>
#include<cstdio>


using namespace std;
 
class yingdie
{
protected:
  char name[25];
  int type; 
  char country[25]; 
  double price,allprice;  
  int amount,amount1;
  char riqi[25];
public:
  yingdie(){num=0;  name[0]=0;  type=0; country[0]=0; price=0; amount=0; riqi[0]=0; next=0;}
  virtual ~yingdie(){}                          //virtual
  yingdie *next;
  int num;
  virtual void Input()  //增加信息
  {
    cout<<"请输入影碟编号:";  cin>>num;
    cout<<"请输入影碟名称:";  cin>>name;
    cout<<"请输入影碟所属国家：";cin >> country;
    cout<<"影碟的租价:";      cin>>price;
cout<<"入库日期为:";      cin>>riqi;

    cout<<"公司的库存数量:";  cin>>amount;
  }

  virtual void Input(ifstream &f)  
  {
    f>>num>>name>>type>>country>>price>>riqi>>amount;
  }

  virtual void Output()=0; //读取值为空 
  virtual void Output(ofstream& f)=0;  

  friend class cangku;
};

class CD:virtual public yingdie 
{
public:
  CD(){type=1;}  
  virtual void Output()
  {
    
    cout<<setw(6)<<num;             
    cout<<setw(10)<<name;           
    cout<<setw(10)<<type; 
cout << setw(10) << country;        
    cout<<setw(10)<<price; 
cout<<setw(10)<<riqi;
    cout<<setw(6)<<amount<<endl;   
  }
  virtual void Output(ofstream& f)