solution of question 1
[SET –2]

A common place to buy candy is from a machine. The machine sells candies, chips, gum, and cookies. You have been asked to write a program for this candy machine.
The program should do the following:
1. Show the customer the different products sold by the candy machine.
2. Let the customer make the selection.
3. Show the customer the cost of the item selected.
4. Accept money from the customer.
5. Release the item.

 

//************************************************************
// class cashRegister 
// This class specifies the members to implement a cash register.
//************************************************************

class cashRegister
{
    private:
	int cashOnHand; 
    public:
	cashRegister(); //Constructor Sets the cash in the register to a default amount.
	cashRegister(int cashIn); //Constructor Sets the cash in the register to a specific amount.
	int getCurrentBalance();	//The value of cashOnHand is returned.
	void acceptAmount(int amountIn);//Function to receive the amount deposited by the customer  
                                          //and update amount in the register.
};

//************************************************************
// class dispenserType
// This class specifies the members to implement a dispenser.
//************************************************************

class dispenserType
{
   private:
	int numberOfItems; //variable to store the number of items in the dispenser
	int cost; //variable to store the cost of an item
   public:
	dispenserType(); //Constructor Sets the cost and number of items in the dispenser to the default
	dispenserType(int setNoOfItems, int setCost); //Constructor Sets to the values specified
	int getNoOfItems();	//The value of numberOfItems is returned.
	int getCost();	//Function to show the cost of the item. The value of cost is returned.
	void makeSale(); //Function to reduce the number of items by 1.
};


cashRegister::cashRegister()
{
	cashOnHand = 500;
}

cashRegister::cashRegister(int cashIn)
{
	cashOnHand = cashIn;
}

int cashRegister::getCurrentBalance()
{
	return cashOnHand;
}

void cashRegister::acceptAmount(int amountIn)
{

	cashOnHand = cashOnHand + amountIn;
}

dispenserType::dispenserType()
{
	numberOfItems = 50;
	cost = 50;
}

dispenserType::dispenserType(int setNoOfItems, int setCost)
{
	numberOfItems = setNoOfItems;
	cost = setCost;
}

int dispenserType::getNoOfItems()
{
	return numberOfItems;
}

int dispenserType::getCost()
{
	return cost;
}

void dispenserType::makeSale()
{
	numberOfItems--;
}


//*****************************************************
// This program uses the classes cashRegister and
// dispenserType to implement a candy machine.
// ****************************************************

#include <iostream.h>

void showSelection();
void sellProduct(dispenserType& product, cashRegister& pCounter);
int main()
{
	cashRegister counter;
	dispenserType candy(100, 50);
	dispenserType chips(100, 65);
	dispenserType gum(75, 45);
	dispenserType cookies(50, 85);
	int choice;
	showSelection();
	cin >> choice;
	while (choice != 5)
	{
		switch (choice)
		{
			case 1:
				sellProduct(candy, counter);
				break;
			case 2:
				sellProduct(chips, counter);
				break;
			case 3:
				sellProduct(gum, counter);
				break;
			case 4:
				sellProduct(cookies, counter);
				break;
			default:
				cout << "Invalid selection." << endl;
		}
		showSelection();
		cin >> choice;
	}	
	return 0;
}

void showSelection()
{
	cout << "*** Welcome to Candy Shop ***" << endl;
	cout << "To select an item, enter " << endl;
	cout << "1 for Candy" << endl;
	cout << "2 for Chips" << endl;
	cout << "3 for Gum" << endl;
	cout << "4 for Cookies" << endl;
	cout << "5 to exit" << endl;
}

void sellProduct(dispenserType& product, cashRegister& pCounter)
{
	int amount; //variable to hold the amount entered
	int amount2; //variable to hold the extra amount needed
	if (product.getNoOfItems() > 0) //if the dispenser is not empty
	{
		cout << "Please deposit " << product.getCost() << " cents" << endl;
		cin >> amount;
		if (amount < product.getCost())
		{
			cout << "Please deposit another " << product.getCost()- amount << " cents" << endl;
			cin >> amount2;
			amount = amount + amount2;
		}
		
		if (amount >= product.getCost())
		{
			pCounter.acceptAmount(amount);
			product.makeSale();
			cout << "Collect your item at the bottom and " << "enjoy." << endl;
		}

		else
			cout << "The amount is not enough. " << "Collect what you deposited." << endl;
		cout << "*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*" << endl << endl;
	}
	else
		cout << "Sorry, this item is sold out." << endl;
}