How to save the player's health so the game can end

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


using namespace std;


class Player {
public:
    int health = 100;
    bool isAlive = true;
};


class Computer {
public:
    int health = 100;
    bool isAlive = true;
};

void playerAttack(int x)
{
    Player player{};

    Computer computer{};

    srand((unsigned)time(0));

    int damageTaken;

    damageTaken = (rand() % 41) + 15;

    if (damageTaken == 41)
    {
        damageTaken = 40;
    }

    x = computer.health = computer.health - damageTaken;

    cout << "you have taken " << damageTaken << " damage from the computer. Its health is now " << computer.health << endl;
}


void playerHeal(int x)
{

    Player player{};

    srand((unsigned)time(0));

    int healthHealed;

    healthHealed = (rand() % 30) + 15;

    x = player.health = player.health + healthHealed;

    if (player.health > 100)
    {
        player.health = 100;
    }

    cout << "You have healed " << healthHealed << " damage. Your health is now " << player.health << endl;
}


void computerAttack(int x)
{
    Computer computer{};

    Player player{};

    int computerHealth = computer.health;

    srand((unsigned)time(0));

    int damageTaken;

    damageTaken = (rand() % 40) + 15;

    x = player.health = player.health - damageTaken;

    cout << "the computer has taken " << damageTaken << " damage from you. Your health is now " << player.health << endl;
}


void computerHeal(int x)
{

    Computer computer{};

    int computerHealth = computer.health;

    srand((unsigned)time(0));

    int healthHealed;

    healthHealed = (rand() % 30) + 15;

    int convertTo100 = healthHealed + computer.health;

    x = computer.health = computer.health + healthHealed;

    if (computer.health > 100)
    {
        computer.health = 100;
    }

    cout << "The computer has healed " << healthHealed << " damage. Its health is now " << computer.health << endl;
}


void computerRandomChoose()
{
    Computer computer{};

    Player player{};

    srand((unsigned)time(0));

    int randomMove;

    randomMove = (rand() % 3) + 1;


    if (computer.health == 100)
    {
        computerAttack(player.health);
    }

    else if (randomMove == 2)
    {
        computerAttack(player.health);
    }

    else if (randomMove == 3)
    {
        computerAttack(player.health);
    }

    else
    {
        computerHeal(computer.health);
    }

}


void askPlayerWhatToDo()
{
    Computer computer{};

    Player player{};
    cout << "Will you attack (a), or heal (h): ";

    char choice;

    cin >> choice;

    if (choice == 'a')
    {
        playerAttack(computer.health);
    }

    else if (choice == 'h')
    {
        playerHeal(player.health);
    }


    else
    {
        cout << "Invalid choice, please retry" << endl;

        askPlayerWhatToDo();
    }

}


void theGame()
{
    Player player{};

    Computer computer{};

    while (player.health > 0 && computer.health > 0) {

        askPlayerWhatToDo();

        computerRandomChoose();
    }

    if (player.health <= 0)
    {
        player.isAlive = false;

        cout << "The computer has won. " << endl;
    }

    else if (computer.health <= 0)
    {
        computer.isAlive = false;

        cout << "You have won" << endl;
    }

    else if (computer.health == 0 && player.health == 0)
    {
        cout << "You and the computer have died. So you tied." << endl;
    }

    if (player.health == 0 || computer.health == 0)
    {
        cout << "Do you want to restart? (y = yes, n = no): ";

        char choice;
        cin >> choice;

        if (choice == 'y')
        {
            theGame();
        }
    }
 }


int main()
{
    cout << "Do you want to start a new game? (y = yes, n = no): ";

    char choice;

    cin >> choice;

    if (choice == 'y')
    {
        theGame();
    }

    return 0;

}