#include <stdio.h>
#define NIL (0)
int key[5] = { 0, 1, 2, 3, 4 }; // key °ª ´ëÄ¡
class Person {
public:
	int x;
	Person() { }
	virtual void doingX(Person *spouse = NIL);
	void doingY(Person *spouse = NIL);
};
class Man : public Person {
public:
	Man() { }
	virtual void doingX(Person *spouse = NIL);
	void doingY(Person *spouse = NIL);
};
class Woman : public Person {
public:
	Woman() { }
	virtual void doingX(Person *spouse = NIL);
	void doingY(Person *spouse = NIL);
};
void Person::doingX(Person *spouse) {
	printf("%d\n",key[0]);
	if (spouse != NIL) {
		spouse->doingX();
	}
}
void Person::doingY(Person *spouse) {
	printf("%d\n",key[1]);
	if (spouse != NIL) {
		spouse->doingY();
	}
}
void Man::doingX(Person *spouse) {
	printf("%d\n",key[2]);
	if (spouse != NIL) {
		spouse->doingX();
	}
}
void Man::doingY(Person *spouse) {
	printf("%d\n",key[3]);
	if (spouse != NIL) {
		spouse->doingY();
	}
}
void Woman::doingX(Person *spouse) {
	printf("%d\n",key[4]);
	if (spouse != NIL) {
		spouse->doingX();
	}
}
void Woman::doingY(Person *spouse) {
	printf("%d\n",key[0]);
	if (spouse != NIL) {
		spouse->doingY();
	}
}
void main()
{
	Man *adam = new Man();
	Woman *eve = new Woman();
	adam->doingX(eve);
	eve->doingX(eve);
	adam->doingY(eve);
}