С++ вопрос программирование

 #include <cstdlib> 
#include <ctime> 
#include <iostream>

#define RAND(min, max) (rand() % ((max) - (min)) + (min))

using namespace std;

class Entity { 
    int hp = 0; 
    int defense = 0; 
    int attack = 0; 
    friend ostream& operator<<(ostream& out, const Entity& entity) { 
        return out  
            << "defense: " << entity.defense << '\n' 
            << "attack: " << entity.attack; 
    } 
public: 
    Entity(int hp, int defense, int attack) 
        : hp(hp), defense(defense), attack(attack) {} 
    int get_hp() const { 
        return hp; 
    } 
    void init_defense() { 
        ++defense; 
    } 
    void init_attack() { 
        ++attack; 
    } 
};

void game_process(Entity& entity) { 
    if (entity.get_hp()) { 
        while (true) { 
            const auto action = RAND(0, 11); 
            if (!action) break; 
            action & 1  
                ? entity.init_defense() 
                : entity.init_attack(); 
        } 
    } 
}

int main() { 
    srand(static_cast<unsigned>(time(nullptr)));  
    Entity hero(10, 5, 7); 
    Entity easy_enemy(5, 4, 3); 
    Entity middle_enemy(7, 5, 5); 
    Entity hard_enemy(10, 6, 7); 
    game_process(hero); 
    cout << hero << '\n'; 
}