Tic-Tac-Toe Game

This project is a simple implementation of the classic Tic-Tac-Toe game in Python. It is designed for two players, with each taking turns to play as either X or O. The game is interactive and text-based, making it easy to play directly in the terminal.

How to Play

1. Objective: The goal of the game is to align three of your marks (X or O) either horizontally, vertically, or diagonally on a 3x3 grid before your opponent does.
2. Inputs: Players input a number between 1 and 9 to place their mark in the corresponding cell of the grid. The grid cells are numbered as follows:

   1 | 2 | 3
   ---------
   4 | 5 | 6
   ---------
   7 | 8 | 9
   

3. Rules:
   • A cell can only be marked if it is empty (-).
   • If a player inputs an invalid number or selects an already marked cell, they will be prompted to try again.

Features

• Interactive Gameplay: The game prompts each player with their turn and highlights errors if any invalid moves are made.
• Dynamic Board: The grid updates in real-time after each move.
• Winner Detection: The game checks for a winner after each turn and announces the result immediately.
• Tie Detection: If all cells are filled and no winner is determined, the game declares a tie.

Code Overview

Global Variables

• board: Represents the 3x3 game grid.
• currentPlayer: Tracks the player whose turn it is (X or O).
• winner: Stores the winner of the game (if any).
• gameRunning: A flag to keep the game running until it ends.

Functions

1. printBoard(board) Displays the current state of the board in a visually appealing format.

2. playerInput(board) Prompts the current player to input a move, validates the input, and updates the board accordingly.

3. checkHorizontal(board) Checks for a winning condition in the horizontal rows.

4. checkRow(board) Checks for a winning condition in the vertical columns.

5. checkDiagonal(board) Checks for a winning condition in the diagonal lines.

6. checkTie(board) Checks if the board is full and declares a tie if no winner is found.

7. checkWin() Combines all winning checks and announces the winner if any.

8. switchPlayer() Alternates the currentPlayer between X and O.

Game Loop

The game runs in a loop, displaying the board, accepting inputs, checking for a winner or tie, and switching players until the game concludes.

Example Gameplay

- | - | -
---------
- | - | -
---------
- | - | -
Enter a number 1-9 Player (X) : 1
X | - | -
---------
- | - | -
---------
- | - | -
Enter a number 1-9 Player (O) : 5
X | - | -
---------
- | O | -
---------
- | - | -
...
The winner is X

How to Run

1. Install Python (if not already installed).
2. Copy the code into a .py file.
3. Open a terminal and run the script using:

   python <filename>.py

4. Follow the prompts to play.

Future Enhancements

• Add a graphical user interface (GUI).
• Implement an AI opponent for single-player mode.
• Allow customizable board sizes.

Enjoy playing Tic-Tac-Toe!