sting array input

[obdi]

This is a vending machine project. The vendor can input/change items and price... I'm stuck on how to make my VendingItem an "variable" type, and I may declare an int type to hold the price, but how can i make the price pointing to the right item? (Suppose I will input 5 items) Here is my code, it's not much.... Thanks~!

#include <iostream>
#include <string>
#include <math.h>
using namespace std;
//class vendor, vendor control, change items
class vendor
{
public:
	int VendorArraySize;
	string VendingItem[];
	char Choice;

	void call_user_interface()
	{
		cout << "Would you like to change the price or items? \n"
			<< "For Item Enter I or i \n"
			<< "For Price Enter P or p \n";
		cin >> Choice;
		//Item add/change
		if(Choice == 'I' || Choice == 'i')
		{
			cout << "Please enter how many items you want to put in:(1-5) " << endl;
			for(int E = 1; E < 2; E++)
			{
				cin >> VendorArraySize;
			}
			cout << "Please enter the item(s) that you wish to sell : " << endl;
			for(int E = 0; E <= VendorArraySize; E++)
			{
				getline(cin, VendingItem[]);
			}
		}
		cout << "You've Enter the following Items : " << endl;
		for ( int i = 0; i <= VendorArraySize; i++)
		{
			cout << i+1 << " " << VendingItem << endl;
		}
		//Price change
		if(Choice == 'P' || Choice == 'p')
		{
		}
	} 
};
//class customer, selling function
class customer
{
public:
	int itemNumber, totalCost;
	double amount, change;
	char Choice;
	void call_user_interface()
	{
		cout << "Items that entered from vendor() and price: Hello $ 3.90 ...." << endl;
		cout << "Please Enter The Amount You Wish To Spend: $" << amount << endl;
		cin >> amount;
		cout << "Please select your item!" << endl;
		cin >> itemNumber;
		/*if(amount < " *ITEM'S PRICE* ")
		{
			cout << "Not enough money, please reenter the amount!" << endl;
		}
		else
		{
		cout << "Here is your " << " *SELECTED ITEM* " << "!" << endl;
		change = amount - " *ItemPrice* ";
		cout << "And your change is: $" << change << endl;
		}*/
	}
};
//start up
class mainPrompt
{
	customer myCustomer;
	vendor myVendor;
public:
	void call_user_interface()
	{
		char Choice;
		do
		{
			cout <<"Please Enter Your Choice: \n"
			<<"-V- as vendor control \n"
			<<"-S- as ready to sell \n"
			<<"-Q- to quit the program \n";
			cin >> Choice;
 
			if (Choice == 'V' || Choice == 'v')
			myVendor.call_user_interface();
			if (Choice == 'S' || Choice == 's')
			myCustomer.call_user_interface();
		}while(Choice != 'Q' && Choice != 'q');
	}
};
//main 
int main()
{
	mainPrompt Prompt;
	Prompt.call_user_interface();
	return 0;
}