🕹️ Tic Tac Toe in C++

A simple command-line Tic Tac Toe game written in C++ with multiple game modes and computer AI strategies.

🎮 Features

• 4 Game Modes:

  1. Human vs Human
  2. Human vs Nonsense Computer (random moves)
  3. Human vs Sensible Computer (basic strategy)
  4. Nonsense Computer vs Sensible Computer

• Two AI Players:

  • NonsenseComputerPlayer: chooses random empty cells.
  • SensibleComputerPlayer: tries to win, block the opponent, or create future winning opportunities.

• Board Display: Clean console-based 3x3 board.

• Input Validation: Ensures valid mark and box choices.

• Replay Option: Play again without restarting the program.

🛠️ How It Works

The game uses object-oriented design:

• Player is an abstract base class.
• HPlayer (human), NonSenseComputerPlayer, and SensibleComputerPlayer are derived classes.
• Board manages board state and drawing.
• Game class coordinates the entire gameplay loop.

🧠 Sensible AI Strategy

The SensibleComputerPlayer evaluates the board in this order:

1. Win: If it can win in this move, it does.
2. Block: If the opponent can win next, it blocks.
3. Opportunity: If it can create a future win (1 in a line), it tries.
4. Fallback: Otherwise, it picks a random empty cell.

🚀 Getting Started

🧾 Prerequisites

• A C++ compiler (e.g., g++, clang++, or MSVC)

🔧 Build Instructions

Open a terminal and compile with:

g++ TicTacToeTask.cpp -o TicTacToe

Run the game:

./TicTacToe     # on Linux or Mac
TicTacToe.exe   # on Windows

🖥️ Example Gameplay

==== TIC TAC TOE ====
Select game mode:
1: Human vs Human
2: Human vs Nonsense Computer
3: Human vs Sensible Computer
4: Nonsense Computer vs Sensible Computer
Enter your choice (1-4): 3
Choose mark for Player 1 (O/X): X
Game Mode: Human vs Sensible Computer

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

📂 File Structure

TicTacToeTask.cpp    # Main source file containing all game classes
README.md            # This documentation file

✍️ Author

• Created as part of an OOP lab project using C++.
• Developed by Zohaib Khan.

📜 License

This project is open-source and free to use. Attribution appreciated!