21 sticks

#include <iostream>
#include <string>

using namespace std;
// varibles for menu
void menu ();
void pvp ();
void pvc ();
int k = 0;
int selection = 0;
int sticks = 0;
int n = 0;

int main(){
    menu();
    return 0;

}

void menu ()
{
  cout << endl;         // menu opptions / entering 1 or 2 will take you to diffrent codes
  cout << " Please choose from the following options - \n";
  cout << " 1. Player vs player.\n";
  cout << " 2. Player vs Computer.\n";
  cin >> selection;

  if (selection == 1)
    {
      pvp ();
    }
  else if (selection == 2)
    {
      pvc ();
    }
}

// setting the pvp code
void pvp () {

// setting varibles
    string player1;
    string player2;
    char yn = 'y';
    // varibles for random turn
    int pick=1, win=0, pturn;
    srand(time(NULL));
    int random = rand();

    // rules
    cout << "Welcome to the 21 Sticks Game on c++" << endl << endl;
    cout << "The goal is to not be the person that has to take the last stick"
      << endl;
    cout << "You can only pick 1,2, or 3 sticks per turn" << endl;

    // getting names
    cout << "player 1 enter your name";
    cin >> player1;
    cout << "player 2 enter your name";
    cin >> player2;
    cout << endl << endl;

     if (random % 2 == 0)
        {
            cout << player1 << " goes first" << endl << endl;
            pturn = 0;
        }


        else
        {
            cout << player2 << " goes first" << endl << endl;
            pturn = 1;
        }

    //loop for player 1 turns
    const int total = 21;
    int n, remainder;
    bool winner = false;
    // varibles for player vs player
    remainder = total;

    while (!winner)
    {
        // code for the turns
        if (remainder >= 0)
        {
            cout << " There are " << remainder << " sticks. " << endl;
            cout << " Player 1, pick a number between 1 and 3. " << endl;
            cin >> n;
        }
            if ( n > 0 && n < 4)
            {
                cout << "You have removed " << n << " sticks." << endl;
                remainder -= n;
            }
            else
            {
                cout << "Invalid number" << endl;
                cout << "Please enter a number between 1 and 3." << endl;
                cin >>n;
                cout << " Player 1 removed " << n << " sticks." <<endl;
                remainder -=n;
            }
            if (remainder >= 0)
            {
                cout << "There are " << remainder << " sticks." << endl;
                cout << " Player 2, pick a number between 1 and 3." << endl;
                cin >> n;
            }
            if ( n > 0 && n < 4)
            {
                cout << "You have removed " << n << " sticks." << endl;
                remainder -= n;}
            else
            {
                cout << "Invalid number" << endl;
                cout << "Please enter a number between 1 and 3." << endl;
                cin >>n;
                cout << "You have removed " << n << " sticks." <<endl;
                remainder -=n;
            }
            if (remainder == 0)
            {
                winner = true;
                cout << "Player 1 wins!";

            }
    }

}
// finishing the player vs player code

// player vs computer code
void pvc () {

    int sticks=21,n=0;
}
void display_left_sticks()
{   sticks=sticks-n;
    cout<<" Remaining sticks = "<<sticks;
    if(sticks==1){cout<<"You loss";} // losing codes
}

// the code for the computer to win every time
void cpu_stick_pick()
{
if(n==1){sticks=sticks-3;cout<<" Computer Picked 3 "; n=0;}
else if(n==2){sticks=sticks-2;cout<<" Computer Picked 2 ";n=0;}
else if(n==3){sticks=sticks-1;cout<<" Computer Picked 1 ";n=0;}
}

int joaquin ()
{
    cout << "Welcome to the 21 Sticks Game on c++ against a computer" << endl << endl;
    cout << "The goal is to not be the person that has to take the last stick"
      << endl;
    cout << "You can only pick 1,2, or 3 sticks per turn" << endl;
    cout<<" We have 21 sticks ";
    do
    {
    cout<<" Your turn ";
    cin>>n; // setting limits
    if(n!=1&&n!=2&&n!=3){cout<<" Invalid input ";n=0; continue;}
    display_left_sticks();
    cpu_stick_pick();
    display_left_sticks();
    }
    while(sticks!=1);
    return 0;
}