Game Sample: Tic Tac Toe

Below is my attempt at a 2 player Tic Tac Toe game. It’s fairly simple, but very neatly done. I’m currently working on an AI to incorporate into the program as an option for single players. I will be sure to post when finished! Heres some output:

//
//  main.cpp
//  Tic Tac Toe
//
//  Created by Aidan Takami on 3/8/18.
//  Copyright © 2018 Aidan Takami. All rights reserved.
//

#include 
using namespace std;

//Array to represent the spots on the board
char spot[10] = {'o','1','2','3','4','5','6','7','8','9'};


int ifWon();
void board();
void clearBoard();

//Main method
int main()
{
    
        cout << "\n\n\tTic Tac Toe\n\n";
start:

    int player = 1,i = -1,choice;

    char side, playOn;
    
    //Game loop, which will continue while no player has won
    while(i==-1){
        
        //Draws the board
        board();
        
        //Deciphers which players turn it is, using the modulus operator
        player=(player%2)?1:2;
        
        //Intro text & takes players move
        cout << "Player " << player << ", enter a number:  ";         cin >> choice;
        
        //Decides the team that the current player is on (X's or O's)
        side=(player == 1) ? 'X' : 'O';
        
        
        //Will take the player's move and mark the correct box (if unoccupied) with the correct side
        if (choice == 1 && spot[1] == '1')
            
            spot[1] = side;
        else if (choice == 2 && spot[2] == '2')
            
            spot[2] = side;
        else if (choice == 3 && spot[3] == '3')
            
            spot[3] = side;
        else if (choice == 4 && spot[4] == '4')
            
            spot[4] = side;
        else if (choice == 5 && spot[5] == '5')
            
            spot[5] = side;
        else if (choice == 6 && spot[6] == '6')
            
            spot[6] = side;
        else if (choice == 7 && spot[7] == '7')
            
            spot[7] = side;
        else if (choice == 8 && spot[8] == '8')
            
            spot[8] = side;
        else if (choice == 9 && spot[9] == '9')
            
            spot[9] = side;
        
        //If selected box is occupied
        else
        {
            cout<<"Invalid move ";
            
            //gives the same player another turn
            player--;
            cin.ignore();
            cin.get();
        }
        
        //determines if the board contains a win or draw.
        i=ifWon();
        
        //Continues the play process
        player++;
    }
    
    //If a player won, draws the board and announces who won
    board();
    if(i==1)
        
        cout<<"Player "<<--player<<" wins! ";
    
    //If draw, announces a draw
    else
        cout<<"==>\aGame draw";
    
    
    //Gives players an option to play again
    cout << "Would you like to play again? (y/n)" << endl;     cin >> playOn;
    
    if(playOn == 'y' || playOn == 'Y' ){
        clearBoard();
        goto start;
    }
    
    else
    return 0;
}

//function that returns the result of the game

int ifWon()
{
   
    //Game was won
    if (spot[1] == spot[2] && spot[2] == spot[3])
        return 1;
    else if (spot[4] == spot[5] && spot[5] == spot[6])
        
        return 1;
    else if (spot[7] == spot[8] && spot[8] == spot[9])
        
        return 1;
    else if (spot[1] == spot[4] && spot[4] == spot[7])
        
        return 1;
    else if (spot[2] == spot[5] && spot[5] == spot[8])
        
        return 1;
    else if (spot[3] == spot[6] && spot[6] == spot[9])
        
        return 1;
    else if (spot[1] == spot[5] && spot[5] == spot[9])
        
        return 1;
    else if (spot[3] == spot[5] && spot[5] == spot[7])
        
        return 1;
    
    
    //Game was a draw
    else if (spot[1] != '1' && spot[2] != '2' && spot[3] != '3'
             && spot[4] != '4' && spot[5] != '5' && spot[6] != '6'
             && spot[7] != '7' && spot[8] != '8' && spot[9] != '9')
        
        return 0;
    
    
    //Game still in progress
    else
        return -1;
}



//Function that draws the board
void board()
{
 
    cout << endl << endl << endl;
    
    //Prints each box of the board with the contents of the array properly alligned
    cout << "Player 1 (X)  -  Player 2 (O)" << endl << endl << endl;
    cout << "     |     |     " << endl;
    cout << "  " << spot[1] << "  |  " << spot[2] << "  |  " << spot[3] << endl;
    cout << "_____|_____|_____" << endl;
    cout << "     |     |     " << endl;
    cout << "  " << spot[4] << "  |  " << spot[5] << "  |  " << spot[6] << endl;
    cout << "_____|_____|_____" << endl;
    cout << "     |     |     " << endl;
    cout << "  " << spot[7] << "  |  " << spot[8] << "  |  " << spot[9] << endl;
    cout << "     |     |     " << endl << endl;
}


//Method to clear the board & reset all values
void clearBoard(){

    spot[1] = '1';
    spot[2] = '2';
    spot[3] = '3';
    spot[4] = '4';
    spot[5] = '5';
    spot[6] = '6';
    spot[7] = '7';
    spot[8] = '8';
    spot[9] = '9';

}