Program that gives exact change of quarters, dimes, etc...

[jean28]

Hey guys. I'm trying to write a program that calculates the change of something that was bought, and then I have to say, in dollars,quarters, dimes, nickels, and pennies, how I will give the change back to the customer. I have most of it done but I'm having some problems. Could anyone tell me what's wrong with my code?

/*
 *  A cash register totals up sales and computes change due
 */

public class CashRegister 
{
	private double cost;
	private int amountpayed;
	private double change;
	private double dollarnext;
	private double quarternext;
	private double dimenext;
	private double nickelnext;

	
	
	/*
	 * Constructs a cash register with no money on it
	 */
	public CashRegister()
	{
		cost = 0;
		amountpayed = 0;
	}
	
	/** 
	 * Records the sale of an item
	 */
	public void RecordPurchase(double purchasecost)
	{
		cost = purchasecost;
	}
	
	/**
	 * Enters the payment received from the customer
	 */
	public void enterPayment(int dollar, int quarter, int dime, int nickel, int penny)
	{

		amountpayed = (int) ((dollar * 1.00) + (quarter * 0.25) + (dime * 0.10) + (nickel * 0.05) + (penny * 0.01));
		
		change = amountpayed - cost;
	}
	

	
	public int giveDollars()
	{
		int dollarchange = (int) (change/1);
		dollarnext = (int) (change % 1);
		return dollarchange;
	}
	
	public int giveQuarters()
	{
		int quarterchange = (int) (dollarnext/0.25);
		quarternext = (int) (dollarnext % 0.25);
		return quarterchange;
	}
	
	public int giveDimes()
	{
		int dimechange = (int) (quarternext/0.10);
		dimenext = (int) (quarternext % 0.10);
		return dimechange;
	}
	
	public int giveNickels()
	{
		 int nickelchange = (int) (dimenext/0.05);
		int pennynext = (int) (quarternext % 0.05);
		return nickelchange;
	}
	
	public int givePennies()
	{
		 int pennychange = (int) (nickelnext/0.01);
		return pennychange;
	}
}

public class ChangeTester 
{
	public static void main(String[] args)
	{
		CashRegister register = new CashRegister();
		
		register.RecordPurchase(8.37);
		register.enterPayment(10, 0, 0, 0, 0);
		System.out.println("Dollars: " + register.giveDollars());
		System.out.println("Quarters: " + register.giveQuarters());
		System.out.println("Dimes: " + register.giveDimes());
		System.out.println("Nickels: " + register.giveNickels());
		System.out.println("Pennies: " + register.givePennies());
		
	}

}

Output:

Dollars: 1
Quarters: 0
Dimes: 0
Nickels: 0
Pennies: 0

The expected output should be 1 Dollar, 2 Quarters, 1 Dime, 0 Nickels, 3 Pennies. I have the dollar. How do I fix the other four?

[jean28]

I have updated the code and now I'm almost there. I'm supposed to get 3 pennies, yet I get 0. Not sure why, though:

/*
 *  A cash register totals up sales and computes change due
 */

public class CashRegister 
{
	private double cost;
	private double amountpayed;
	private double change;
	private double dollarnext;
	private double quarternext;
	private double dimenext;
	private double nickelnext;
	private double pennynext;

	
	
	/*
	 * Constructs a cash register with no money on it
	 */
	public CashRegister()
	{
		cost = 0;
		amountpayed = 0;
	}
	
	/** 
	 * Records the sale of an item
	 */
	public void RecordPurchase(double purchasecost)
	{
		cost = purchasecost;
	}
	
	/**
	 * Enters the payment received from the customer
	 */
	public void enterPayment(int dollar, int quarter, int dime, int nickel, int penny)
	{

		amountpayed = ((dollar * 1.00) + (quarter * 0.25) + (dime * 0.10) + (nickel * 0.05) + (penny * 0.01));
		
		change = amountpayed - cost;
	}
	

	
	public int giveDollars()
	{
		int dollarchange = (int) (change/1);
		dollarnext = (change % 1);
		return dollarchange;
	}
	
	public int giveQuarters()
	{
		int quarterchange = (int) (dollarnext/0.25);
		quarternext = (dollarnext % 0.25);
		return quarterchange;
	}
	
	public int giveDimes()
	{
		int dimechange = (int) (quarternext/0.10);
		dimenext = (quarternext % 0.10);
		return dimechange;
	}
	
	public int giveNickels()
	{
		int nickelchange = (int) (dimenext/0.05);
		pennynext =(quarternext % 0.05);
		return nickelchange;
	}
	
	public int givePennies()
	{
		 int pennychange = (int) (nickelnext/0.01);
		 pennynext = (nickelnext % 0.01);
		 return pennychange;
	}
}

Dollars: 1
Quarters: 2
Dimes: 1
Nickels: 0
Pennies: 0

[JosAH]

Your method is fine, except you shouldn't do all those calculations in the double domain; use the int domain instead; all you have to do is consider the penny as the monetary unit, so a quarter is worth 25 pennies, a dollar is 100 pennies etc.

kind regards,

Jos