project2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TIC_TAC_TOE
{
    class Program
    {
 public static int checkWinner(char[] arr)
{
    //Horizontal
    if (arr[1] == arr[2] && arr[2] == arr[3])
    {
        return 1;
    }
    else if (arr[4] == arr[5] && arr[5] == arr[6])
    {
        return 1;
    }
    else if (arr[7] == arr[8] && arr[8] == arr[9])
    {
        return 1;
    }
    //Vertical
    else if (arr[1] == arr[4] && arr[4] == arr[7])
    {
        return 1;
    }
    else if (arr[2] == arr[5] && arr[5] == arr[8])
    {
        return 1;
    }
    else if (arr[3] == arr[6] && arr[6] == arr[9])
    {
        return 1;
    }
    //Diagonal
    else if (arr[1] == arr[5] && arr[5] == arr[9])
    {
        return 1;
    }
    else if (arr[3] == arr[5] && arr[5] == arr[7])
    {
        return 1;
    }
    else
    {
        return 0;
    }
}
public static void displayGame(char[] arr)
        {
            Console.WriteLine("     |     |      ");

            Console.WriteLine("  {0}  |  {1}  |  {2}", arr[1], arr[2], arr[3]);

            Console.WriteLine("_____|_____|_____ ");

            Console.WriteLine("     |     |      ");

            Console.WriteLine("  {0} |   {1}  |   {2}", arr[4], arr[5], arr[6]);

            Console.WriteLine("_____|_____|_____ ");

            Console.WriteLine("     |     |      ");

            Console.WriteLine("  {0}  |  {1}  |  {2}", arr[7], arr[8], arr[9]);

            Console.WriteLine("     |     |      ");
        }
public static void Main(string[] args)
        {
            char[] arr = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
            int player = 1;
            int choice;
            int flag = 0;
            int counter = 0;
           do
            {
                displayGame(arr);
                Console.WriteLine("Player 1 is 'X' amd player 2 is 'O'");
                choice = int.Parse(Console.ReadLine());

                   if(arr[choice] != 'X' && arr[choice] != 'O')
                    {
                    if (player % 2 == 0)
                    {
                        arr[choice] = 'O';
                        player++;
                    }
                    else
                    {
                        arr[choice] = 'X';
                        player++;
                    }
                }
                else
                {
                    Console.WriteLine("sorry but row {1} has already been chosen by {0}", choice, arr[choice]);
                }

                switch (checkWinner(arr))
                {

                    case 1:
                        Console.WriteLine("{0} won the game", arr[choice]);
                        flag = 1;
                        break;

                    case -1:
                        Console.WriteLine("it´s a DRAW");
                        flag = -1;
                        break;

                    default:
                        break;
                }
                counter++;
                if (counter == 9)
                {
                    Console.WriteLine(" its a Draw");
                    break;
                }

            } while (flag != 1 && flag != -1);

            Console.ReadLine();
                   }
            }
        }