C / C++ / MFC

#include<iostream>
using namespace std;
class abstrs
{
public:
	virtual int add(int i,int j)=0;
	virtual int Substract(int i,int j)=0;


};
class derieved : public abstrs
{
public :
virtual	int add(int i,int c)
	{
	return 100;
	
	}//i dont want to implement this piece of code as of now.
	/*virtual	int Substract(int i,int c)
	{
	return 100;
	}*/

};
int main()
{
	derieved dr;
	int count=dr.add(12,34);
	cout<<g;

}