(Game: play a tic-tac-toe game) In a game of tic-tac-toe,...

(Game: play a tic-tac-toe game) In a game of tic-tac-toe, two players take turns marking an available cell in a $3 \times 3$ grid with their respective tokens (either $\mathrm{X}$ or O). When one player has placed three tokens in a horizontal, vertical, or diagonal row on the grid, the game is over and that player has won. A draw (no winner) occurs when all the cells in the grid have been filled with tokens and neither player has achieved a win. Create a program for playing tic-tac-toe. The program prompts two players to alternately enter an $X$ token and an $O$ token. Whenever a token is entered, the program redisplays the board on the console and determines the status of the game (win, draw, or continue). Here is a sample run:

(Game: play a tic-tac-toe game) In a game of tic-tac-toe, two players take turns marking an available cell in a $3 \times 3$ grid with their respective tokens (either $\mathrm{X}$ or
O). When one player has placed three tokens in a horizontal, vertical, or diagonal row on the grid, the game is over and that player has won. A draw (no winner) occurs when all the cells in the grid have been filled with tokens and neither player has achieved a win. Create a program for playing tic-tac-toe.

The program prompts two players to alternately enter an $X$ token and an $O$ token. Whenever a token is entered, the program redisplays the board on the console and determines the status of the game (win, draw, or continue). Here is a sample run:

Key Concepts

Player Alternation

Player alternation is the mechanism used to switch control between the two players, ensuring that each player has a chance to make a move in turn. This not only keeps the game fair but also simplifies the flow of the program by alternating the active token between the two participants.

Console Output Display

The console output display is responsible for showing the current state of the board and any game messages to the players after each move. It plays a key role in maintaining user engagement by providing a clear, visual representation of the game state, move prompts, and the game's outcome.

Draw Condition

The draw condition comes into play when the board is completely filled with tokens and no winning condition has been met. Evaluating this condition is important to determine when the game ends in a tie. It ensures that the game correctly identifies when no further moves will change the outcome.

User Input Handling

User input handling is focused on capturing and validating player moves. It ensures that players provide valid inputs corresponding to empty cells within the board's bounds. Proper error-checking routines need to be implemented to prevent invalid moves, making the game both user-friendly and robust.

Board Representation

Board representation involves choosing an efficient way to model the tic-tac-toe grid, typically as a 2D array or list. This data structure holds the current state of the board, indicating which cells have been marked by which player. An appropriate representation is essential for efficiently checking game conditions and for providing a visual display of the game to the players.

Game Loop

The game loop is the central mechanism that keeps the game running until a termination condition is met. In the context of tic-tac-toe, the loop continuously prompts players to take turns, updates the game board based on inputs, and checks for end-of-game conditions after each move. This loop ensures that the game progresses smoothly from start to finish.

Win Condition Evaluation

Win condition evaluation refers to the process of determining if a player has won the game by placing three of their tokens in a row. This involves checking all possible winning combinations, including horizontal, vertical, and diagonal arrangements. An effective win-checking algorithm is central to the correct functionality of the game.

Transcript

0:00 Hello.

00:01 For programming exercise 11 .9, you are essentially asked to write a program that plays tic tactoe.

00:11 So i decided to write a couple of functions here that will help.

00:17 But the very first thing that i decided to do was to initialize the game board.

00:23 So for my game board, i'm using a three by three matrix.

00:28 And it starts off with just a empty space in all of these spaces.

00:35 I next wanted to define a function that will draw the game board.

00:41 So that is just draw board.

00:44 We're going to start by printing a line and then for every row in the matrix we want to print a sort of vertical line here.

00:57 Then whatever the matrix is at that position, vertical line, next one, so on and so forth.

01:05 And then underneath we want to, again, print a horizontal line.

01:13 So this should draw our game board and will look pretty similar to the game board in the sample run in the textbook.

01:22 And then next, i decided to define a function that will take a turn for a specific player.

01:29 So i've defined turn of p where p is the player.

01:33 And so the row is going to be the input for player p on enter a row.

01:41 And column will be the input from enter a column.

01:46 And then matrix row of column then should be equal to p.

01:52 So if it's the x player, then it'll be x.

01:54 If it's the o player, it'll be o.

01:58 And turn is also going to return row and columns so that we know where the person recently placed their x or o.

02:11 And then lastly, not lastly, we have a couple of additional ones here.

02:17 So next, i wanted to define a function that would essentially play the game.

02:22 So define tick -tac -toe.

02:24 We start by drawing the board.

02:27 Player x goes first, so i set p equal to x.

02:31 And i have a win condition.

02:35 So i want to keep playing as long as no one has won.

02:39 And as soon as someone wins, the game should end.

02:42 So i'm going to start by stating that win is equal to false because no one has won.

02:48 While win remains false, ij, so row column should be equal to turn of p, so the player's turn.

02:59 We're going to draw the board again so we can see the updated board, and then we need to check whether or not the player won.

03:07 So i needed to define one more function here is win.

03:15 So for is win, what i decided to do is to check, and then this is very similar to sudoku...

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