#include <iostream>
using namespace std;
class Hero;
class Weapon{
	int atk;
public:
	Weapon(int atk = 2):atk(atk){}
	int getak(){return atk;}
	void addatk(int atk){
		atk+=atk;
	}
	virtual void getWeapon(){}
};

class knife:public Weapon{
	int spd;
public:
	knife(int atk = 0,int spd = 0):Weapon(atk),spd(spd){}
	virtual void getWeapon(){
		addatk(getak());
		spd+=spd;
	}

};

class axe:public Weapon{
	int hp;
public:
	axe(int atk=0 ,int hp = 0):Weapon(atk),hp(hp){}
	virtual void getWeapon(){
		addatk(getak());
		hp+=hp;
	}
};

class sword:public Weapon{
	int def;
public:
	sword(int atk = 0 ,int def = 0):Weapon(atk),def(def){}
	virtual void getWeapon(){
		addatk(getak());
		def+=def;
	}
};

class Hero{
	int atk;
	int def;
	int spd;
	int hp;
public:
	Hero(int atk =0 ,int def = 0 ,int spd=0 , int hp = 0):atk(atk) , spd(spd) , hp(hp) , def(def){}
	void setatk(int atk){this->atk = atk;}
	void setdef(int def){this->def = def;}
	void setspd(int spd){this->spd = spd;}
	void sethp(int hp){this->hp = hp;}
	int getatk(){return atk;}
	int getdef(){return def;}
	int getspd(){return spd;}
	int gethp(){return hp;}

	void equipWeapon(Weapon* *arr){
		for(int i= 0 ; i<2 ; i++){
			arr[i]->getWeapon();
		}
	}
};
int main(){
	knife A(5,20);
	axe B(1,30);
	sword C(2,40);
	Hero R;
	Weapon*arr[3]={&A , &B , &C };
	R.equipWeapon(arr);
	cout << R.getatk() <<R.getdef() << R.getspd()<<R.gethp() <<endl;
}

正解————————————————————————————

#include <iostream>
using namespace std;
class Weapon;
 class Hero{
     int atk;
     int def;
     int spd;
     int hp;
 public:
     Hero(int atk =1,int def = 1 ,int spd=0 , int hp = 0):atk(atk) , spd(spd) , hp(hp) , def(def){}
     void setatk(int atk){this->atk = atk;}
     void setdef(int def){this->def = def;}
     void setspd(int spd){this->spd = spd;}
     void sethp(int hp){this->hp = hp;}
     int getatk(){return atk;}
     int getdef(){return def;}                                                                             
     int getspd(){return spd;}
     int gethp(){return hp;}
 
     void equipWeapon(Weapon* w );
	 void show(){
		cout << "atk"<<atk <<endl;
		cout << "def"<<def <<endl;
		cout << "spd"<<spd <<endl;
		cout << "h p"<<hp <<endl;
		cout << "-------" <<endl;
	 }
       
 };

class Weapon{
	int atk;
public:
	Weapon(int atk = 2):atk(atk){}
	int getAtk(){return atk;}
	void setatk(int atk){atk+=atk;	}
	virtual void addProperty(Hero& hero){}
};

class knife:public Weapon{
	int spd;
public:
	knife(int atk = 1,int spd = 1):Weapon(atk),spd(spd){}
	void setSpd(int spd){this->spd = spd;}
	int getspd(){return spd;}
	virtual void addProperty(Hero& hero){
		int atk = hero.getatk() + this->getAtk();
		int spd = hero.getspd()+this->spd;
		hero.setatk(atk);
		hero.setspd(spd);
	}

};

class axe:public Weapon{
	int hp;
	public:
	axe(int atk=0 ,int hp = 0):Weapon(atk),hp(hp){}
	void setHp (int hp){this->hp = hp;}
	int getHp(){return hp;}
	virtual void addProperty(Hero& hero){
		int atk = hero.getatk() + this->getAtk();
		int hp = hero.gethp()+this->hp;
		hero.setatk(atk);
		hero.sethp(hp);
 }

};

class sword:public Weapon{
	int def;
public:
	sword(int atk = 0 ,int def = 0):Weapon(atk),def(def){}
	void setDef (int def){this->def = def;}
	int getdef(){return def;}
	virtual void addProperty(Hero& hero){
		int atk = hero.getatk() + this->getAtk();
		int def = hero.getdef()+this->def;
		hero.setatk(atk);
		hero.setdef(def);
	}

};
void Hero::equipWeapon(Weapon* w){
	w->addProperty(*this);
}

int main(){
	knife A;
	axe B;
	sword C;
	Hero h1 , h2 , h3;
	h1.equipWeapon(&A);
	h2.equipWeapon(&B);
	h3.equipWeapon(&C);

	h1.show();
	h2.show();
	h3.show();
}