Question

Visual Basic: Create an application that simulates a tic tac toe game. The form uses 9 large labels to display the x's and o's. The application should use a two dimensional integer array to simulate the game board in memory. When the user clicks the "New Game" button the application should step throguh the array storing a random number of 0 to 1 in each element. The numer 0 represent the letter o and the number 1 reprsents the letter x. The form should then be updated to display the gameboard. The application should display a message indicating whether "x wins" or "o wins" or "tie".

Note: Since it is a simulation and random x's and o's fill the board there could be two winners or no winner both which would be considered a tie.

This is the code I have so far but I am not sure if the logic is correct. I think the problem lies in the checkForWin function as I am getting false conditons:

Public Class Form1
Dim game(2, 2) As Integer
Const intMAX_ROW As Integer = 2
Const intMAX_COL As Integer = 2
Dim rand As New Random
Dim intRow As Integer
Dim intCol As Integer
'CheckForWin function to check for a valid winner.
Public Function CheckForWin(value As Integer) As Boolean
Dim hasWin As Boolean

'Check each row

For intRow As Integer = 0 To intMAX_ROW
hasWin = True
For intCol As Integer = 0 To intMAX_COL
If game(intRow, intCol) <> value Then
hasWin = False
End If
Next
Next

'Check each column
For intCol As Integer = 0 To intMAX_COL
hasWin = True
For intRow As Integer = 0 To intMAX_ROW
If game(intCol, intRow) <> value Then
hasWin = False
End If
Next
Next

'Check diagonal top right to bottom left
For intRow As Integer = 0 To intMAX_ROW
hasWin = True
If game(intRow, intRow) <> value Then
hasWin = False
End If
Next

'Check diagonal top left to bottom right
For intRow As Integer = 0 To intMAX_ROW
hasWin = True
If game(intRow, intRow) <> value Then
hasWin = False
End If
Next
If hasWin = True Then Return True
Return False
End Function

Private Sub btnExit_Click(sender As Object, e As EventArgs) Handles btnExit.Click
'Close the form
Me.Close()
End Sub

Private Sub btnNewGame_Click(sender As Object, e As EventArgs) Handles btnNewGame.Click
'Randomly fill array with a value of 0 or 1
For intRow As Integer = 0 To 2
For intCol As Integer = 0 To 2
Dim n As Integer = rand.Next(2)
game(intRow, intCol) = n
Next
Next
'Determine if an X or O will be the text by the random value placed in the subscript.
If game(0, 0) = 1 Then
lbl1.Text = "X"
Else
lbl1.Text = "O"
End If
If game(0, 1) = 1 Then
lbl2.Text = "X"
Else
lbl2.Text = "O"
End If
If game(0, 2) = 1 Then
lbl3.Text = "X"
Else
lbl3.Text = "O"
End If
If game(1, 0) = 1 Then
lbl4.Text = "X"
Else
lbl4.Text = "O"
End If
If game(1, 1) = 1 Then
lbl5.Text = "X"
Else
lbl5.Text = "O"
End If
If game(1, 2) = 1 Then
lbl6.Text = "X"
Else
lbl6.Text = "O"
End If
If game(2, 0) = 1 Then
lbl7.Text = "X"
Else
lbl7.Text = "O"
End If
If game(2, 1) = 1 Then
lbl8.Text = "X"
Else
lbl8.Text = "O"
End If
If game(2, 2) = 1 Then
lbl9.Text = "X"
Else
lbl9.Text = "O"
End If
'Call CheckForWin function to determine if game is a tie or a player won.
Dim winnerO As Boolean = CheckForWin(0) 'check for an O's winner by value 0
Dim winnerX As Boolean = CheckForWin(3) 'check for an X's winner by value 3
If winnerO = True And winnerX = True Then
lblMessage.Text = "Tie game!"
ElseIf winnerO = False And winnerX = False Then
lblMessage.Text = "Tie game!"
ElseIf winnerO = True And winnerX = False Then
lblMessage.Text = "O wins!"
ElseIf winnerX = True And winnerO = False Then
lblMessage.Text = "X wins!"
End If
End Sub

End Class

Answer 1

using System;

using System.Threading;

namespace TIC_TAC_TOE

{

    class Program

    {

        //making array and   

        //by default I am providing 0-9 where no use of zero  

        static char[] arr = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

        static int player = 1; //By default player 1 is set  

        static int choice; //This holds the choice at which position user want to mark   

        // The flag veriable checks who has won if it's value is 1 then some one has won the match if -1 then Match has Draw if 0 then match is still running  

        static int flag = 0;

        static void Main(string[] args)

        {

            do

            {

                Console.Clear();// whenever loop will be again start then screen will be clear  

                Console.WriteLine("Player1:X and Player2:O");

                Console.WriteLine("\n");

                if (player % 2 == 0)//checking the chance of the player  

                {

                    Console.WriteLine("Player 2 Chance");

                }

                else

                {

                    Console.WriteLine("Player 1 Chance");

                }

                Console.WriteLine("\n");

                Board();// calling the board Function  

               choice = int.Parse(Console.ReadLine());//Taking users choice   

                // checking that position where user want to run is marked (with X or O) or not  

                if (arr[choice] != 'X' && arr[choice] != 'O')

                {

                    if (player % 2 == 0) //if chance is of player 2 then mark O else mark X  

                    {

                        arr[choice] = 'O';

                        player++;

                    }

                    else

                    {

                        arr[choice] = 'X';

                        player++;

                    }

                }

                else //If there is any possition where user want to run and that is already marked then show message and load board again  

                {

                    Console.WriteLine("Sorry the row {0} is already marked with {1}", choice, arr[choice]);

                    Console.WriteLine("\n");

                    Console.WriteLine("Please wait 2 second board is loading again.....");

                    Thread.Sleep(2000);

                }

                flag = CheckWin();// calling of check win  

            } while (flag != 1 && flag != -1);// This loof will be run until all cell of the grid is not marked with X and O or some player is not win  

            Console.Clear();// clearing the console  

            Board();// getting filled board again  

            if (flag == 1)// if flag value is 1 then some one has win or means who played marked last time which has win  

            {

                Console.WriteLine("Player {0} has won", (player % 2) + 1);

            }

            else// if flag value is -1 the match will be draw and no one is winner  

            {

                Console.WriteLine("Draw");

            }

            Console.ReadLine();

        }

        // Board method which creats board  

        private static void Board()

        {

            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("     |     |      ");

        }

        //Checking that any player has won or not  

       private static int CheckWin()

        {

            #region Horzontal Winning Condtion

            //Winning Condition For First Row   

            if (arr[1] == arr[2] && arr[2] == arr[3])

            {

                return 1;

            }

           //Winning Condition For Second Row   

            else if (arr[4] == arr[5] && arr[5] == arr[6])

            {

                return 1;

            }

            //Winning Condition For Third Row   

            else if (arr[6] == arr[7] && arr[7] == arr[8])

            {

                return 1;

            }

            #endregion

            #region vertical Winning Condtion

            //Winning Condition For First Column       

            else if (arr[1] == arr[4] && arr[4] == arr[7])

            {

                return 1;

            }

            //Winning Condition For Second Column  

            else if (arr[2] == arr[5] && arr[5] == arr[8])

            {

                return 1;

            }

            //Winning Condition For Third Column  

            else if (arr[3] == arr[6] && arr[6] == arr[9])

            {

                return 1;

            }

            #endregion

            #region Diagonal Winning Condition

            else if (arr[1] == arr[5] && arr[5] == arr[9])

            {

                return 1;

            }

            else if (arr[3] == arr[5] && arr[5] == arr[7])

            {

                return 1;

            }

            #endregion

            #region Checking For Draw

            // If all the cells or values filled with X or O then any player has won the match  

            else if (arr[1] != '1' && arr[2] != '2' && arr[3] != '3' && arr[4] != '4' && arr[5] != '5' && arr[6] != '6' && arr[7] != '7' && arr[8] != '8' && arr[9] != '9')

            {

                return -1;

            }

            #endregion

            else

            {

                return 0;

            }

        }

    }

}