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++

# What we have
Here is the snap of our `startGame()` function.


void startGame() {
    char board[9];
    initialize(board);
    int gameMode = getMode();
    play(board, gameMode);
}

We have completed the first two steps (`initialize()` and `getMode()`). Now is the time to look at the `play()` function in detail.

# Requirements of this module
The `play()` function receives two parameters (`board` and `gameMode`) from its caller (`startGame`). It uses these values to make decisions in `displayBoard()`, `getMove()`, `updateBoard()` and `gameEnds()` functions. It should also declare three local variables: `currentPlayer`, `move`, and `gameOn`. The first variable stores `X` as the first current player for this round. The round can be identified by the iteration of the loop: First iteration means the first round. At the end of each round the users should be switched. We should perform the following steps to complete this task:
- Receive two parameters: `board` and `mode`.
- Declare the variables to store the current player, the move of the current player, and the status of the game at the end of the round.
- Send the suitable parameters to its subordinate functions so that the program can execute without errors.

> **Note:** We should not worry about the details of the subordinate functions (`displayBoard()`, `getMove()`, `updateBoard()`, `gameEnds()`, and `switchPlayer()`) at this stage.

- Correctly use the returned value of subordinate functions.

# Try it yourself
All the functions are already defined. You just have to implement the given function and execute the code.

Learn how to implement the play function.

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Main Loop Modules

What we have

Requirements of this module