Booleans

In Tic Tac Toe, players take turns. We need to track whose turn it is.

The bool Type:

bool stores true or false values. Perfect for tracking states like "is it X's turn?"

Example:

bool public isGameActive = true;

For Our Game:

We'll use bool public xTurn; to track whose turn it is.

• If xTurn is true, it's X's turn

• If xTurn is false, it's O's turn

Add the xTurn variable to your contract, then initialize it to true in the startGame function (X goes first).

Add turn tracking

Requirements:

Declares bool public xTurn

Initializes xTurn in startGame

Sets xTurn to true

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract TicTacToe {
    address public playerX;
    address public playerO;

    enum Cell { Empty, X, O }

    Cell[9] public board;

    function startGame(address _opponent) public {
        playerX = msg.sender;
        playerO = _opponent;
    }

    function makeMove(uint _position) public {
        require(board[_position] == Cell.Empty, "Cell already taken");
        board[_position] = Cell.X;
    }
}