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#include <iostream>
#include <string>
using namespace std;
void displayInfo(void);
typedef class MEDIA
{
protected:
int Id;
string Title;
int Year;
public:
MEDIA()
{
Id=0;
Title="";
Year=0;
}
virtual ~MEDIA(){}
virtual bool ChangeID(int)=0;
virtual void Print(ostream&)=0;
}*pMEDIA;
class DVD:public MEDIA
{
protected:
string Director;
public:
DVD()
{
Director="";
}
virtual ~DVD(){}
bool ChangeID(int newId)
{
Id=newId;
return true;
}
void Print(ostream&);
};
int main()
{
pMEDIA newMedia=NULL;
newMedia=new DVD; //这里出现问题
return 0;
}