c++帮我填一个空

#include<iostream.h>
#include<string.h>

class base
{
protected:
char title[80];
public:
virtual void gettitle()=0;
virtual void printtitle()=0;
virtual bool isgood()=0;
};

class book:public base
{
protected:
int numsold;
public:
void gettitle()
{
cout<<"书名:";
cin.getline(title,80);
}
void printtitle()
{
cout<<"书名:"<<title<<":";
}
void getsold()
{
cout<<"每月书销售量:";
cin>>numsold;
}

bool isgood()
{
return (numsold>500)?true:false;
}
};

class journal:public base
{
protected:
int numsold;
public:
void gettitle()
{

cout<<"书名:";
cin.getline(title,80); //填写代码
}
void printtitle()
{
cout

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