### CashRegister.java

/**
A cash register totals up sales and computes change due. Also keeps track
of the number of items in sale.
*/
public class CashRegister
{
public static final double QUARTER_VALUE = 0.25;
public static final double DIME_VALUE = 0.1;
public static final double NICKEL_VALUE = 0.05;
public static final double PENNY_VALUE = 0.01;
private double purchase;
private double payment;
/**
Constructs a cash register with no money in it.
*/
public CashRegister()
{
purchase = 0;
payment = 0;
}
/**
Records the purchase price of an item.
@param amount the price of the purchased item
*/
public void recordPurchase(double amount)
{
double newTotal = purchase + amount;
purchase = newTotal;
}
/**
Enters the payment received from the customer.
@param dollars the number of dollars in the payment
@param quarters the number of quarters in the payment
@param dimes the number of dimes in the payment
@param nickels the number of nickels in the payment
@param pennies the number of pennies in the payment
*/
public void enterPayment(int dollars, int quarters,
int dimes, int nickels, int pennies)
{
payment = dollars + quarters * QUARTER_VALUE + dimes * DIME_VALUE
+ nickels * NICKEL_VALUE + pennies * PENNY_VALUE;
}
/**
Computes the change due and resets the machine for the next customer.
@return the change due to the customer
*/
public double giveChange()
{
double change = payment - purchase;
purchase = 0;
payment = 0;
return change;
}
public int getItemCount()
{
. . .
}
}