Getting variables from different functions

[Ch1156]

Ok so im making this dinosaur battle game and i need to get: A from A = rand()
because i need to use it in a different function and i dont know how to do that, i used to but then i forgot. so how do i access variables in different function is m question, can you please include an example showing me, here is my code if you need it.

#include <iostream>
#include <string>
#include <ctime>
#include <random>

using namespace std;

void MAINPROGRAM();
void DinosaurRandomize();
void TRex();
void Player();
void Entrance();
void VRaptor();
void Hospital();

int PlayerHealth = 100;
int TRexHealth = 100;
int VRaptorHealth = 100;
int opponentH = 0;

bool turn = true;


int main()
{

}

void Player()
{
    int Shotgun = 5;
    int Knife = 3;
    int Fist = 1;
    int RocketLauncher = 7;

    string choice;

        cout << "1. Use Shotgun - 5 DMG" << endl;
        cout << "2. Use Knife - 3 DMG" << endl;
        cout << "3. Use Fist - 1 DMG" << endl;
        cout << "4. Use Rocket Launcher - 7 DMG" << endl;
        cin >> choice;

    while(turn != false)
    {
        if(PlayerHealth <= 0)
        {
            cout << "You have lost! Press ENTER to go back to the entrance." << endl;
            Hospital();
        }

        if(choice == "1." || choice == "1")
        {
            cout << "\n";
            cout << "You used the Shotgun!" << endl;
            cout << "\n";
            opponentH -= 5;
            cout << "T-Rex's Health: " << TRexHealth << endl;
            turn == false;
            TRex();
        }
        else if(choice == "2." || choice == "2")
        {
            cout << "\n";
            cout << "You used the Knife!" << endl;
            cout << "\n";
            opponentH -= 3;
            cout << "T-Rex's Health: " << TRexHealth << endl;
            turn == false;
            TRex();
        }
        else if(choice == "3." || choice == "3")
        {
            cout << "\n";
            cout << "You used your fist!" << endl;
            cout << "\n";
            opponentH -= 1;
            cout << "T-Rex's Health: " << TRexHealth << endl;
            turn == false;
            TRex();
        }
        else if(choice == "4." || choice == "4")
        {
            cout << "\n";
            cout << "You used the Rocket Launcher" << endl;
            cout << "\n";
            opponentH -= 7;
            cout << "T-Rex's Health: " << TRexHealth << endl;
            turn == false;
            TRex();
        }
    }
}


void DinosaurRandomize()
{
    time_t T;
    time(&T);
    srand(T);

    int A;

    for(int R = 0; R < 3; ++R)
    {
        A = rand() % 2;
    }

    switch(A)
    {
        case 0:
            TRex();
            break;
        case 1:
            VRaptor();
            break;
    }
}


void TRex()
{
    int X;

    time_t T;
    time(&T);
    srand(T);

    for(int R = 0; R < 1; ++R)
    {
        X = rand() % 5;
    }

    int Bite = 5;
    int Slash = 6;
    int Pounce = 4;
    int Quick Attack = 5;

    if(TRexHealth <= 0)
        {
            cout << "\n";
            cout << "You have defeated the T-Rex!!!" << endl;
            cout << "\n";
            cin.get();
            Entrance();
        }

        switch(X)
        {
            case 0:
                cout << "\n";
                cout << "T-Rex used Bite!" << endl;
                cout << "\n";
                PlayerHealth -= 5;
                cout << "Your Health: " << PlayerHealth << endl;
                cout << "\n";
                Player();
                break;
            case 1:
                cout << "\n";
                cout << "T-Rex used Stomp!" << endl;
                cout << "\n";
                PlayerHealth -= 4;
                cout << "Your Health: " << PlayerHealth << endl;
                cout << "\n";
                Player();
                break;
            case 2:
                cout << "\n";
                cout << "T-Rex used Charge!" << endl;
                cout << "\n";
                PlayerHealth -= 5;
                cout << "Your Health: " << PlayerHealth << endl;
                cout << "\n";
                Player();
                break;
            case 3:
                cout << "\n";
                cout << "T-Rex used Chew!" << endl;
                cout << "\n";
                PlayerHealth -= 7;
                cout << "Your Health: " << PlayerHealth << endl;
                cout << "\n";
                Player();
                break;
            case 4:
                cout << "\n";
                cout << "T-Rex's attack missed!" << endl;
                cout << "\n";
                PlayerHealth -= 0;
                cout << "Your Health: " << PlayerHealth << endl;
                cout << "\n";
                Player();
                break;
    }
}


void VRaptor()
{
    int X;

    time_t T;
    time(&T);
    srand(T);

    for(int R = 0; R < 1; ++R)
    {
        X = rand() % 5;
    }

    int Bite = 5;
    int Stomp = 4;
    int Charge = 5;
    int Chew = 7;

    if(VRaptorHealth <= 0)
        {
            cout << "\n";
            cout << "You have defeated the Veloci Raptor!!!" << endl;
            cout << "\n";
            cin.get();
            Entrance();
        }

        switch(X)
        {
            case 0:
                cout << "\n";
                cout << "Raptor used Bite!" << endl;
                cout << "\n";
                PlayerHealth -= 5;
                cout << "Your Health: " << PlayerHealth << endl;
                cout << "\n";
                Player();
                break;
            case 1:
                cout << "\n";
                cout << "Raptor used Stomp!" << endl;
                cout << "\n";
                PlayerHealth -= 4;
                cout << "Your Health: " << PlayerHealth << endl;
                cout << "\n";
                Player();
                break;
            case 2:
                cout << "\n";
                cout << "Raptor used Charge!" << endl;
                cout << "\n";
                PlayerHealth -= 5;
                cout << "Your Health: " << PlayerHealth << endl;
                cout << "\n";
                Player();
                break;
            case 3:
                cout << "\n";
                cout << "Raptor used Chew!" << endl;
                cout << "\n";
                PlayerHealth -= 7;
                cout << "Your Health: " << PlayerHealth << endl;
                cout << "\n";
                Player();
                break;
            case 4:
                cout << "\n";
                cout << "Raptor's attack missed!" << endl;
                cout << "\n";
                PlayerHealth -= 0;
                cout << "Your Health: " << PlayerHealth << endl;
                cout << "\n";
                Player();
                break;
    }
}

void Hospital()
{

}

[hamsterman]

You can't use a variable from one function in another. That is why they are called local.
There are two things that you can do:
1) Return the value of the variable you want from the function via the return statement. You need to make sure that you call the generating function from the function that needs the value.
2) Assign the value you need to a global variable. Then you can use the value anywhere you like. Although if you have to do this, your program is probably structured poorly. You should prefer 1).

By the way, what do you expect

for(int R = 0; R < 3; ++R)
{
    A = rand() % 2;
}

to do? A is just one variable. Reconsider it.