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
We have created a function to display the board. Here is the snap of the `getMove()` function, which calls the `getUserMove()` function.


int getMove(char board[], int mode, char currentPlayer) {
    int move;
    if (mode == 1 && currentPlayer == 'O') {
        move = getComputerMove(board);
        cout << "Computer chose: " << move << "\n";
    } 
    else {
        move = getUserMove(currentPlayer, board);
    }
    return move;
}

Now, we need to ask for user input to place the markers "**X**" and "**O**" on the board. We can place markers on board at any position from $1-9$.



# Requirements of this module
We can create a function `getUserMove()` that takes user input and returns it. There is a catch here. 

We can’t place our marker in a position if it’s already taken. We have to check if the user’s move is valid or not. We need to follow these steps to complete this task:

- Create a variable to store user moves.

- Take input from the user.

- Check if the entered number is between 0 and 8 and that position is not taken.

- If it's true, the move is valid.

- Return the variable.

# Try it yourself

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



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The User Move

What we have