using System;

public class Program

{

        namespace TicTacToeExercise

{

    internal class Program

    {

        // the playfield

        static char[,] playField =

        {

            {'1','2','3'}, // Row 0

            {'4','5','6'}, // Row 1

            {'7','8','9'} // Row 2

        };

​

        static void Main(string[] args)

        {

            int player = 2; // Player 1 starts

            int input = 0;

            bool inputCorrect = true;

​

            // run code as long as the program runs

            do

            {

​

                if (player == 2)

                {

                    player = 1;

                    EnterXorO(player, input);

                }

                else if(player == 1)

                {

                    player = 2;

                    EnterXorO(player, input);

                }

​

                SetField();

                #region 

                // check winning condition

                char[] playerChars = { 'X', 'O' };

​

                foreach(char playerChar in playerChars)

                {

                    if ((playField[0, 0] == playerChar) && (playField[0, 1] == playerChar) && playField[0, 2] == playerChar))

                        || (((playField[1, 0] == playerChar) && (playField[1, 1] == playerChar) && playField[1, 2] == playerChar))

                        || (((playField[2, 0] == playerChar) && (playField[2, 1] == playerChar) && playField[2, 2] == playerChar))

                        || (((playField[0, 0] == playerChar) && (playField[1, 0] == playerChar) && playField[2, 0] == playerChar))

                        || (((playField[0, 1] == playerChar) && (playField[1, 1] == playerChar) && playField[1, 2] == playerChar))

                        || (((playField[0, 2] == playerChar) && (playField[2, 1] == playerChar) && playField[2, 2] == playerChar))

                        || (((playField[0, 0] == playerChar) && (playField[1, 1] == playerChar) && playField[2, 2] == playerChar))

                        || (((playField[0, 2] == playerChar) && (playField[1, 1] == playerChar) && playField[2, 0] == playerChar))

                        )

​

                    {

                        if(playerChar == 'X')

                        {

                            Console.WriteLine("\n Player 2 has won!");

                        }

                        else

                        {

                            Console.WriteLine("\n Player 1 has won!");

                        }

                    }

                }

​

                #endregion

​

                #region

                // test if field is already taken

                do

                {

                    Console.Write("\nPlayer {0}: Choose your field!", player);

                    try

                    {

                        input = Convert.ToInt32(Console.ReadLine());

                    }

                    catch

                    {

                        Console.WriteLine("Please enter a number.");

                    }

                    if ((input == 1) && (playField[0, 0] == '1'))

                        inputCorrect = true;

                    else if ((input == 2) && (playField[0, 1] == '2'))

                        inputCorrect = true;

                    else if ((input == 3) && (playField[0, 2] == '3'))

                        inputCorrect = true;

                    else if ((input == 4) && (playField[1, 0] == '4'))

                        inputCorrect = true;

                    else if ((input == 5) && (playField[1, 1] == '5'))

                        inputCorrect = true;

                    else if ((input == 6) && (playField[1, 2] == '6'))

                        inputCorrect = true;

                    else if ((input == 7) && (playField[2, 0] == '7'))

                        inputCorrect = true;

                    else if ((input == 8) && (playField[2, 1] == '8'))

                        inputCorrect = true;

                    else if ((input == 9) && (playField[2, 2] == '9'))

                        inputCorrect = true;

                    else

                    {

                        Console.WriteLine("\n Incorrect input ! Please use another field!");

                        inputCorrect = false;

                    }

​

​

                } while(!inputCorrect);

​

                    #endregion  

​

​

​

            } while (true);

        }

​

        public static void SetField()

        {

            Console.Clear();

            Console.WriteLine("    |    |     ");

            //TODO replace numbers with variables

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

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

            Console.WriteLine("    |    |    ");

            // replace numbers with variables

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

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

            Console.WriteLine("    |    |    ");

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

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

            Console.WriteLine("    |    |    ");

​

​

        }

​

        public static void EnterXorO(int player, int input)

        {

            char playerSign = ' ';

​

            if (player == 1)

                playerSign = 'X';

            else if (player == 2)

                playerSign = 'O';

            switch (input)

            {

                case 1: playField[0, 0] = playerSign; break;

                case 2: playField[0, 1] = playerSign; break;

                case 3: playField[0, 2] = playerSign; break;

                case 4: playField[1, 0] = playerSign; break;

                case 5: playField[1, 1] = playerSign; break;

                case 6: playField[1, 2] = playerSign; break;

                case 7: playField[2, 0] = playerSign; break;

                case 8: playField[2, 1] = playerSign; break;

                case 9: playField[2, 2] = playerSign; break;

            }

        }

    }

}

​