#include "stdio.h"class parent {public:	parent() {};	virtual void Key_Son() {printf("it is the parent called Key_Son()\n");};	virtual void Key_Daughter() {printf("it is the parent called Key_Daughter()\n");};};class son : public parent {public:	son() {};	void Key_Son() {		printf("It is son\n");	}};class daughter: public parent {public:	daughter() {};	void Key_Daughter() {		printf("It is daughter\n");	}};int main() {//	daughter Daughter_ ;//	son Son_;	parent* Parent_;//	Daughter_.Key();//	Son_.Key();	Parent_->Key_Son();//	Parent_.Key_Daughter();	return 0;}