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 place player’s moves on the board. Here is the snap of the `getMove()` function, which calls the `getComputerMove()` 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;
}

Here is the `getComputerMove()` function that simply calls the `randomMove()` function as shown below:



int getComputerMove(char board[]) {
    int move;
    move = randomMove(board);
    return move;
}

We can improve this function by first probing the probability of ourselves winning and then striving to block the opponent from winning. However, we are keeping it simple for now to complete the game with minimal requirements.

# Requirements of this module
One simple way of generating the computer’s move is to use the built-in library function of C++ to generate random numbers. We should perform the following steps to complete this task:
- Write code for the function `randomMove()`.
- Receive a parameter: `board`.
- Declare a variable to store the new move of the computer using `rand()` built-in function.
- Keep generating the move if it is invalid (i.e., the cell is not vacant).
- Return the valid move.

# Try it yourself

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



Learn how to generate the computer's move.

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The Computer Move

What we have