#include <iostream>
using namespace std;
 
class monitor
{
	public:
		virtual int price() = 0; // virtual, meaning ignore and go straight to other subclasses, 
		//if the type WAS NOT nineteenInchMonitor, it would use this.
};
 
class nineteenInchMonitor : public monitor 
{ 
	int price() 
	{ 
		return 99; // return price
	} 
};
 
class twentyInchMonitor : public monitor 
{ 
	int price() 
	{ 
		return 129; 
	} 
};
 
int sell (monitor *mon)
{
	return mon->price(); // get price() of smallMonitor, type nineteenInchMonitor
}
 
int main()
{
	nineteenInchMonitor smallMonitor; twentyInchMonitor bigMonitor; // makes nineteenInchMonitor, type smallMonitor
	cout << sell (&bigMonitor) << endl; // pass pointer onto sell
	return 0;
}
 

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