c++ class problem

[The Rogue Effect]

I'm working on a program using classes and seem to have hit a brick wall.
Here is an example program based on my problem.

class CItem
{
public:
	string Name;
	int Price;
};

CItem Nothing = { " ", -1 };	//Used when the person has dropped an item

class CPerson
{
public:
	void PrintItems()
	{
		cout << "-------Items-------" << endl;
		for(int i=0;i<ItemCount;++i)
			cout << Items[i].Name << endl;
		cout << "-----End Items-----" << endl;
	}
	void Pay(int amount)	//send a negative amount to pay
				//or a positive amount to get paid
	{
		Money += amount;
	}
	void AddItem(CItem item)	//Puts an item at the end of your list
	{
		Items[ItemCount] = item;
		++ItemCount;
	}
	void DropItem(int item)		//drop the item at index item
					//then push each item under that up
					//and finally add a Nothing at the end
	{
		do
		{
			Items[item] = Items[item+1];
			item++;
		} while(item < 8);
		Items[8] = Nothing;
		--ItemCount;
	}
	string Name;
	int Money;
	int ItemCount;
	CItem Items[9];
};

class CStore
{
public:
	bool MainMenu(CPerson& customer)
	{
		cout << "We deal in datatypes and bytes." << endl
			<< "Dost thou wish to buy anything today (y/n)?" << endl;
		char c;
		cin >> c;
		if(c == 'y')
		{
			while(ItemMenu(customer));
		}
		cout << "Please, come again." << endl;
		return false;
	}
	bool ItemMenu(CPerson& customer)
	{
		cout << "What dost thou wish to buy?" << endl
			<< "$" << customer.Money << endl;
		for(int i=0;i<ItemCount;++i)
		{
			cout << i << ") $" << Items[i].Price
				<< "\t\t\t" << Items[i].Name << endl;
		}
		cout << "i) Items" << endl
			<< "q) Quit" << endl;
		char c;
		cin >> c;
		if('0' <= c && c <= (char)'0'+ItemCount-1 && c != 'q')
		{
				int i = (int)(c - '0');	//ugly workaround

			if(customer.Money >= Items[i].Price)
			{
				if(customer.ItemCount < 9)
				{
				   cout << "The " << Items[i].Name << "?" << endl
						<< "Is that okay (y/n)?" << endl;
					char d;
					cin >> d;
					if(d == 'y')
					{
						customer.Pay(-Items[i].Price);
						cout << "You pay $" << Items[i].Price << endl;
						customer.AddItem(Items[i]);
						cout << "You bought the " << Items[i].Name << endl;
						
					}
				}
				else cout << "You cannot hold anymore." << endl;
			}
			else cout << "Sorry. Thou hast not enough money." << endl;
			return true;
		}
		else if(c == 'i') customer.PrintItems();
		else return false;
	}
	CPerson Cashier;
	int Money;
	int ItemCount;		//How many unique items. store doesn't run out.
	CItem Items[4];
};

int main()
{
	CPerson myPerson = { "Michael Toy", 300, 0, {} };
	
	CStore myStore = {
		{ "Dennis Ritchie", 0, 0, {} },	//doesn't do anything
		9001,
		4,				//only 4 items sold
		{
			{ "int", 32 },		//store items & prices
			{ "float", 32},
			{ "char", 8},
			{ "bool", 8}
		}
	};
	
	myStore.MainMenu(myPerson);
}

The code initializes a person and a store and automatically has
the menu displayed.
After the person has bought something and
returned to the main menu all their data
(money, itemcount, items[]) is reset...
I'm guessing I don't fully understand how classes work.

edit: changed member functions to reference arguments (CPerson& customer)

[helios]

You're passing the object by value, not by reference, which makes a copy of the object, so the changes made to it are not reflected in the original.

[The Rogue Effect]

...omg i feel dumb, I actually saw this just now and came to close my topic.
Thanks for the reply though.

[Hammurabi]

You're using your classes a lot like structs:
* You don't have constructors.
* You've made all of the data members in all classes public.
That misses two of the main purposes of classes: automatic initialization and data hiding / encapsulation.

Also, you should move the implementation code out of the class declarations.

class Obj {
public:
  Obj (int, int, int);
  void func ();
private:
  int a;
  int b;
  int c;
};

Obj::Obj (int a_, int b_, int c_) : a(a_), b(b_), c(c_) { }

void Obj::func () { }

int main () {
  Obj obj (1, 2, 3);
}