C++: How do I access a variable from another class definition

I’m trying to make a little pokemon game, that obviously includes attacking another pokemon. Don’t worry about Type; that’s just a ENUM.

Currently not working: The _reciever’s health doesn’t get changed, there are no errors

my current not working code:

class Pokemon
    {
    public:
        string Name;
        Type Type;
        int Health;

        Pokemon(string _name, Pokemons::Type _type, int _health)
        {
            Name = _name;
            Type = _type;
            Health = _health;
        }

        bool checkHealth()
        {
            if (Health <= 0)
            {
                return false;
            }

            return true;
        }
        void updateHealth(char _operator, int _amount)
        {
            switch (_operator)
            {
            case '+':
                Health = Health + _amount;
                break;
            case '-':
                Health = Health - _amount;
                break;
            case '*':
                Health = Health * _amount;
                break;
            case '/':
                Health = Health / _amount;
                break;
            }
        }

        void attackEnemy(Pokemon _reciever)
        {
            _reciever.Health = _reciever.Health - 5;
        }

    };

#include <iostream>
#include "Pokemon.h"

using namespace std;
using namespace Pokemons;

int main()
{
    Pokemon Charmender("Charmender", Fire, 45);
    Pokemon Bulbasaur("Bulbasaur", Water, 50);

    while (true) {
        Charmender.attackEnemy(Bulbasaur);
        cout << Bulbasaur.Health << endl;
    }
}

ps: this is my first ever stackoverflow question, do let me know if I missed something

>Solution :

Currently, you are accessing the other class member variables without problems, but your changes are not as intended because you are passing a copy of the object:

void attackEnemy(Pokemon _reciever)
        {
            _reciever.Health = _reciever.Health - 5;
        }

With this approach, _receiver goes away at the end of your method.
To get persistent changes, you can pass by reference:

void attackEnemy(Pokemon &_reciever)
        {
            _reciever.Health = _reciever.Health - 5;
        }