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 initialized the board as the first step toward preparing the game for the player(s). It is the stage where we should apply the configurations as per the user’s choice. For Tic-Tac-Toe, we have the possibility to set the game mode: “One Player” or “Two Players”. 

When the game starts, it asks us to select a game mode. Let’s create a function that asks the user if they want to play against another human or a computer as the second player.

There are a total of two game modes:

- One Player

- Two Players

# Requirements of this module
We can ask the user to select an option, store the option in a variable, and return it. We need to perform these steps to complete this task:

- Display the modes as a prompt for the user.
- Input the mode (`1` or `2` as a character) from the user.
- Validate the user input: if it’s anything other than `1` or `2`, then input again.
- Return the valid input value.

**Sample output**

```txt
Select game mode:
1. One Player
2. Two Players
```

# 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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Select the Mode

What we have