#include
#include
class Power
{
public:
Power(int i){x=i;}
_______________________;
protected:
int x;
};
class Square:public Power
{
public:
__________________________;
void display()
{
cout
class Power
{
public:
Power(int i){x=i;}
virtual void display()=0;
protected:
int x;
};
class Square:public Power
{
public:
Square(int i):Power(i){};
void display()
{
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