Virtual Pet Game Feed-Back

[Victor89]

I made the following game.

If your pet is older than 10 years old he will die because of his age and there is nothing you can do, but you have to be careful if he is ill not to die or if you don't feed him for a long time he can die also.

I want to make this game like a project so I need ideas for improving it.
Also it could be nice if I can include concepts like inheritance and polymorphism. Does anyone have some cool ideas?

#include "stdafx.h"
#include <iostream>

using namespace std;

class Pet
{
private:
	int mHunger;
	int mBoredom;
	int mSick;
	double mAge;

	int GetMood() const;
	double GetAge() const;
	void PassTime(double time = 1);

public:
	Pet(int Hunger = 0, int Boredom = 0, int Sick = 0, double Age = 0.0);
	void Talk();
	void Eat(int food = 4);
	void Play(int fun = 4);
	void Medicine(int medicine = 2);
	void Age();
	void DisplayStats();
	
};

Pet::Pet(int hunger, int boredom, int sick, double age):
	mHunger(hunger),
	mBoredom(boredom),
	mSick(sick),
	mAge(age)
	{}

void Pet::PassTime(double time)
{
	int sick = rand() % 5;
	mHunger +=time;
	mBoredom +=time;
	if( sick == 3)
	{
	mSick +=sick;
	}
	mAge +=time/10;
}


void Pet::DisplayStats()
{
	cout << "\nHunger level is: " << mHunger << endl;
	cout << "Boredom level is: " << mBoredom << endl;
	cout << "Sickness level is: " << mSick << endl;
	cout << "Age is: " << mAge << endl;
}

int Pet::GetMood() const
{
	return mHunger + mBoredom + mSick;
}

double Pet ::GetAge() const
{
	return mAge;
}

void Pet::Age()
{
	double age = GetAge();
	if(age > 10.0)
	{
		cout << "Your pet is too old and died!";
		_getch();
		exit(0);
		
	}

	else if(age > 5.0)
	{
		cout << "Your pet is an adult.";
	}
	else if(age > 1.0)
	{
		cout <<"Your pet is a child.";
	}
	else if(age < 1.0)
	{
		cout << "Your pet is a baby.";
	}

}
void Pet::Talk()
{
	if(mSick > 15)
	{
		cout << "Your pet was sick and was not treated in time and he died!";
		_getch();
		exit(0);
	}

	if(mHunger > 15 )
	{
		cout << "You didn't feed your pet int time and he died!";
		_getch();
		exit(0);
	}

	cout <<"I am your pet and I feel: ";
	int mood = GetMood();

	if(mood > 15)
	{
		cout <<"mad";
	}
	else if (mood > 10)
	{
		cout << "frustrated";
	}
	else if(mood > 5)
	{
		cout << "ok";
	}
	else 
	{
		cout << "happy";
	}

	
	PassTime();
}

void Pet::Eat(int food)
{
	cout <<"Brruppp!\n";
	mHunger -=food;
	if(mHunger < 0)
		mHunger = 0;
	PassTime();
}

void Pet::Play(int fun)
{
	cout <<"Wheee!\n";
	mBoredom -=fun;
	if(mBoredom < 0)
		mBoredom = 0;
	PassTime();
}

void Pet::Medicine(int medicine)
{
	cout <<"Thanks!\n";
	mSick -=medicine;
	if(mSick < 0)
		mSick = 0;
	PassTime();
}

int main()
{
	Pet pet;
	
	cout << "\nWelcome to the Pet Game 1.0 !\n\n";
	int choice;

	do
	{
		
		cout << "\n\n0 - Quit\n";
		cout << "1 - Listen to your pet\n";
		cout << "2 - Feed your pet\n";
		cout << "3 - Play with your pet\n";
		cout << "4 - Display age\n";
		cout << "5 - Give your pet medicine\n";
		cout << "6 - Display pet stats\n\n";
		cout << "Choice: ";
		cin >> choice;
	

		switch(choice)
		{
		case 0:
			cout <<"Good-bye!\n";
			break;
		case 1:
			pet.Talk();
			break;
		case 2:
			pet.Eat();
			break;
		case 3:
			pet.Play();
			break;
		case 4:
			pet.Age();
			break;
		case 5:
			pet.Medicine();
			break;
		case 6:
			pet.DisplayStats();
			break;
		default:
			cout <<"Sorry but choice " <<choice << " isn't a valid choice\n";
		}
	}while(choice !=0);

	system("pause");
}

[fabtasticwill]

You could have the age more random. so theres a chance that the pet could live up to 12, but its unlikely.

[Victor89]

Thank you for the idea. Yes, that will make the game less predictable and more interesting.