Trying to understand a piece of code.

I am trying to understand a piece of code. I have never seen this used before and can't seem to find any info on it. What is the purpose of the "g" and "g."? The g does not appear anywhere else in the rest of the program.

Code:

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int main()
{
    TicTacToe g;
    g.makeMove();

    return 0;
}

---

g is an instance of the TicTacToe class. What happens is a TicTacToe game is created, the makeMove method is called, then the game is implicitly destroyed and the program exits.

In object oriented code like this, the engine that runs a game of tic tac toe is treated as an object, instead of having less associated functions pass around parts of the game state, or modify the global state. Here There is a TicTacToe object that you can make moves on.

Well, the best thing would be to lookup what classes are how to use them.
Basically, it creates an instance of the TicTacToe class and names it g.
Then it invokes the makeMove member function on g.

So g doesn't necessarily need to called g, but can be called really anything? Also would using getmakeMove(); work as well?

Yes, g is the object. It can be named whatever, so long as you refer to that same object name throughout the code.

e.g:

Code:

---

int main()
{
    TicTacToe wowthisisanobject;
    wowthisisanobject.makeMove();

    return 0;
}

---

Quote:

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Originally Posted by Brian29

So g doesn't necessarily need to called g, but can be called really anything? Also would using getmakeMove(); work as well?

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Yes, g can be whatever; it's a local variable. In fact, it should probably be something longer, and more descriptive.

getmakeMove would not work. makeMove is a method, not a data member. So you must call it like above.

So something along the lines of

Code:

---


int main()
{
    TicTacToe xogame;
    xogame.makeMove();

    return 0;
}

---

would work fine?

Yep. :)

Cool, thanks for the help.

Really, again, it would be better if you took a look at how classes work instead of trying to understand piece wise functionality of the whole thing.