This course will teach beginner-level coders to build the classic game Tic-Tac-Toe in C++ using a modular programming method.

cpp.tar.gz

After learning the basics of C++, it’s a great idea to complete at least one hands-on project where you can build something from scratch using C++. This course offers the opportunity to build the basic but classic Tic-Tac-Toe game, command-line style.

You’ll begin the course by looking at the end product and then building the game step-by-step, adding one tiny feature in each lesson. This way, you’ll add one or two helper functions to the codebase and then test them individually in the main controller function. Because of this modular approach, you’ll finish coding the game efficiently and professionally.

By the end of the course, you’ll have one complete hands-on project in C++ added to your profile.

Tic-Tac-Toe with C++

# Visualizing the function calls
Let's now visualize the function call sequence for the Tic-Tac-Toe game we just created.

Now let's dive into an explanation of the diagram provided above:

- The game starts by calling the `startGame()` function.

## The `startGame()` function
The game starts by calling the `startGame()` function. It performs the following tasks:

- It first initializes the board by calling the `initializeBoard()` function.

- It prompts the user to set the game mode by calling the `getMode()` function.

- It calls the `play()` function.


## The `play()` function
In the `play()` function, a `while` loop manages the gameplay. It performs the following steps:

- It displays the current board state by calling the `displayBoard()` function.

- Acquires the player's move via the `getMove()` function.

- Updates the board utilizing the `updateBoard()` function.

- Assesses if the game has ended by calling the `gameEnds()` function. 

- If the game has ended, the loop concludes; otherwise, it transitions to the next player by calling the `switchPlayer()` function.

## The `getMove()` function
The `getMove()` function is responsible for taking the input from the player (user/computer) to place it on the board. It performs the following steps:

- If the mode is set to `1` and the current player is "O", the function calls `getComputerMove()` to obtain the computer's move and display it. 

- Otherwise, it calls `getUserMove()` to prompt the user for their move. 

## The `getComputerMove()` function
In the `getComputerMove()` function a `randomMove` function is called to generate a random computer move.

## The `gameEnds()` function
The `gameEnds()` function is responsible for ending the game. This function performs the following two steps:

- First, it calls the `checkWin()` function. If the current player wins the function yields a result of `true`, leading to the execution of the `displayBoard()` function.

- Second, it calls the `checkTie()` function. If the game is a tie, the function yields a result of `true`, leading to the execution of the `displayBoard()` function.

## The `checkWin()` function
- The `checkWin()` function is responsible for the check for all the horizontal, vertical, and diagonal winning patterns separately on a board. It employs the logical OR operator (`||`) to check if the player has won either horizontally, vertically, or diagonally on the board by calling the following functions:

  - `checkWinLine()`: To check winning patterns in horizontal and vertical lines.

  - `checkWinDiagonal()`: To check winning patterns in diagonals.



Explore the function call sequence for the Tic-Tac-Toe game.

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Joining the Dots

Visualizing the function calls