Text RPG, how do I set up my program?

I don't know if thats the right way to put it. I have it game set up the following way

Code:

---

int main(){
game rungame;
rungame.start();
return 0;
}

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All my classes have been declared and such. I have included the needed stuff for it any everything. My question is, where does the bulk of what happens in my game go? As it is now I have everything happening in my Game class.

Code:

---

class Game {
public:
        void start();
};
void Game::Start() {
// every single thing that happens is coded here
}

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Is this the correct way to go about doing it?

I would do it something like this:

Code:

---

int main()
{
        if(game.inisialize())  // Read needed data from file, create memory
        {
                while(game.isRunning())  // While the game has not ended, isRunning returns true
                {
                        game.update();  // Move players and so
                }

                game.cleanUp();  // Clear used memory and stuff like that
        }
}

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And then in the update() function I would get user input, move players and calculate everything.

But there are many ways to do this, mine is probably not the best