🎮 Tic Tac Toe (Console Edition)

A simple two-player Tic Tac Toe game built in C# for the console.
Players take turns marking spaces on a 3×3 grid until one player wins or the game ends in a draw.

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🧠 Overview

This program runs directly in the console.
Each player chooses a cell numbered 1–9 to place their symbol (X or O).
The game automatically checks for winning combinations after every move and highlights the winning line when someone wins.

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🕹️ Gameplay Instructions

1. Run the program

   • In Visual Studio → press Ctrl + F5, or
   • In terminal → run:

     dotnet run

2. The grid will display numbers 1–9, each representing a cell:

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

3. Player 1 uses X, Player 2 uses O.

4. Players take turns typing a number between 1–9 to mark their move.

5. Invalid or occupied cell inputs will show an error message and ask again.

6. The game ends when:

• One player gets three in a row (horizontally, vertically, or diagonally), or
• All cells are filled (resulting in a draw).

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🏆 Winning Example

X | O | X ---+---+--- O | X | O ---+---+--- [X]|[X]|[X]

🎉 Congratulations Player 1 (X) wins! Winning line: 7, 8, 9

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🧩 Key Features

✅ Clean console UI with numbered grid
🔁 Turn-based input system
🧠 Automatic win detection across all 8 possible lines
🎯 Highlights the winning line in square brackets [ ]
🚫 Input validation for invalid or already occupied cells

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🧱 Code Structure

Function	Description
GetWinningLine()	Checks all 8 possible winning combinations and returns the winning indexes if found.
PrintGrid(int[] highlight = null)	Renders the 3×3 grid. If a winning line is found, highlights those cells.
(main loop)	Handles player turns, input validation, and win/draw detection.

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⚙️ Requirements

• .NET 6.0 or later (C# 9.0+)
• Works in Visual Studio 2022 or via .NET CLI

🧩 Run using CLI

dotnet build
dotnet run