Question

Please implement the following only using Javascript.

design a cash register class that can be used with inventory item class. The cash register class needs to:

1. ask user for item and quantity being purchased.

2. get the items cost from inventory item object

3. add 30% profit to the cost to get the items unit price

4. multiply the unit price times the quantity being purchased to get purchase subtotal

5. compute a 6% sales tax on the subtotal to get the purchase total

6. display the purchase subtotal, tax, and total to the screen

7. subtract the quantity being purchased from variable of inventory item class object

Thank you for all of your help. remember Only Javascript can be used.

Answer 1

Solution import java.awt.: import java util.*; import java lang.*: import java.io. import iava.util. String import java applet.*; import java Inventoryltem.*; import java io manip.* import java util.Sales; import iava price package cashregister; / InventoryItem class declaration public class Inventoryltem private String description; private double cost private double units; item description * item cost /* Number of units on hand* /l Private member function. private void InventoryItem.createDescription(int size, tangible.RefObject<String> value) // Allocate the default amount of memory for description. description-new byte [size+1]; / Store a value in the memory. description = value. argValue:

//constructor #1 public Inventoryltemo //store an empty string in the description attribute. createDescription(GlobalMembers.DEFAULT_SIZE, ) cost 0.0 units 0 initialize cost.* initialize units. * //constr-cutor #2 public InventoryItem(tangible RefObject<String> desc) /allocate memory and store the description. createDescription(desc argValue.length). desc): cost 0.0 units 0 initialize cost, * initialize units. * //constructor #3 public Inventoryltem(tangible.RefObject<String> desc, double c, double u) //allocate memory and store the description. createDescription(desc.argValue length0, desc); assign values to cost and units. cost = c: units - u Destructor public void dispose0 description null

//Mutator functions public final void setDescription(tangible.RefObject<String> d) description d.argValue; public final void setCost(double c) costc public final void setUnits(double u) unitsu; //Accessor functions //ORIGINAL LINE: const sbyte *getDescription0 const pubic nal String getDescriptiony return description; //ORIGINAL LINE: double getCost0 const public final double getCost0 return cost //ORIGINAL LINE: double getUnits0 const public final double getUnits0 return units;

public class GlobalMembers //Specification file for the Inventoryltem class. //constant for description's default size public static final int DEFAULT SIZE 51 package tangible; public final class RefObject<T> public T argValue; public RefObiect(T refArg) argValue refArg: Specication fle for the Inventoryltem class. public class Sale private double itemCost: private double taxRate; private double itemPrice; private double profitRate: public Sale(double cost) this(cost, 0.06) WORIGINAL LINE: Sale(double cost, double rate public Sale (double cost, double rate) 0.06) itemCost cost taxRate rate:

/ORIGINAL LINE: double getItemCostO const public final double getItemCostO return itemCost; /ORIGINAL LINE: double getTaxRate0 const public final double getTaxRate return taxRate; //ORIGİNAL LINE: double getTax) const public final double getTax) return (itemCost taxRate); WORIGINAL LINE: double getTotal0 const public final double getTotal0 return (itemCost + getTax0); //Specification file for the Inventoryltem class. public class Sale2 private double itemPrice; private double profitRate; public Sale2(double price) this(price, 0.3)

/ORIGINAL LINE: Sale2(double price, double profit- 0.3) public Sale2(double price, double profit) itemPrice price; profitRate profit /ORIGINAL LINE: double getItemPrice) const public final double getItemPriceO return itemPric /ORIGINAL LINE: double getProfitRate0 const e; public final double getProfitRateO return profitRate; /ORIGINAL LINE: double getProfit) const public final double getProfitO return (itemPrice * profitRate); /ORIGINAL LINE: double getTotalUnitPrice0 const public final double getTotalUnitPriceO return (itemPrice + getProfit0)

private static int MainO int numSelected double qtySelected; byte again; double price, double cost; final int NUM ITEMS 5 InventoryItem[] inventory = {1mventoryItem(''Hammer". 6.95, 12) Inventoryltem("Wrench", 8.75, 20), InventoryItem( Pliers", 3.75, 10), Inventoryltem("Ratchet", 7.95, 14), Inventoryltem(" Screwdriver", 2.50, 22)): 0 System. out.print("Here is a list of our current inventory); System.out.print( n") System.out.print(" "): System.out.print( n: System-out.printf("%7d'. "Item Number"): System.out.printf("%d": cout) System. out-printff'%14d". "Description"): System.out.printf("%8a", "Cost"); System.out.printf("%d". "Units on Handn'). System.out.printf("%d". "-- for (int i = 0.1 < NUM ITEMS: i++) Il System out.printf("%7d".): System.out.printf(%21d", inventory[i] getDescription0); System.out.printf("%14d", inventoryli].getCostO); if (qwS elected 0) System.out.printf("%a" inventory[1].getlnitsO): System.out.printf("%d",''in");

else System-out.printf %7d".inventory[i].getUnitsO-qwSelected): System.out.printf"%d", "n'); System-out.printf("%d". "''); System.out.printf("%d","\n") System.out.printf"%d". "") System.out.printf("%d"," n") System-out-printf("%d", "Please enter the item number you wish to purchase: "); numSelected Integer.parselnt(ConsoleInput.readToWhiteSpace(true) whie ((numSelected< 0) (numSelected >5) System.out.printf("%d". "Please enter an inventory item number 0-5. "); numSelected- Integer.parselnt(Consolelnput.readToWhiteSpace(true); System.out.printf"%d". "Please enter the quantity you wish to purchase,''): gtySelected Double.parseDouble(ConsoleInput.readTo WhiteSpace(true)) while (gtySelected > inventorv[numSelectedl.getUnits)) System-out-printf"%d": "Please enter quantity less than or equal to "); System-out. printf %d". Inventory[numSelected].getUnits() System-out.printf("%d". " units: "); qtySelected- Double.parseDouble(ConsoleInput.readTo WhiteSpace(true));

price - inventorv[numSelectedl.getCost: System-out.printf("%d''. '' '') System-out-printf("%d": ''in''); System-out-printf(%d", "Here is the b ,''); System.out.printf("%d" "\n") System.out.printf("%d". " ") System-out.printf("%d". "in'') Sale2 itemSale2-new Sale2(price); double subTotalitemSale2.getTotalUnitPrice0* qtySelected; System.out.printf"%d". "Subtotal: t $"). System.out.printf("%d". subTotal); System.out.printf("%d",''in''): cost = SubTotal: Sale item Sale new Sale(cost): System. out-printf("%d", "Sales taxht S"); system out.printf("%d", itemsale.getlaxO); System-out-printf("%d": "\n") System.out.printf(%d", "Total tt S); System-out-printf("%d". item Sale. getTotalO): System.out.printf("%d". " n') System.out.printf("%d". "Do you want to make another purchase?"); again - Byte.parseByte(ConsoleInput.readToWhiteSpace(true)); System.out.printi(%d". " ") System-out-printf("%d": "\n"); while (againY againy) return 0:

package tangible; public final class Consolelnput private static boolean goodLastRead- false; public static boolean lastReadWasGood(O return goodLastRead; public static String readToWhiteSpace(boolean skipLeadingWhiteSpace) String input char nextChar while (Character is Whitespace(nextChar- (char)System in.read0)) /accumulate leading white space if skipLeadingWhiteSpace is false: if IskipLeading WhiteSpace) inputnextChar; /the first non white space character input+nextChar; //accumulate characters until white space is reached: while (ICharacter is Whitespace(nextChar -(char)System in read input +nextChar; goodLastRead- input length) > 0 return imput

public static String scanfRead return scanfRead(null, -1) public static String scanfRead(String unwantedSequence) return scanfRead(unwantedSequence, -1) public static String scanfRead(String unwantedSequence, int maxFieldLength) String input char nextChar if (unwantedSequence != null) nextChar-''O': for (int charIndex = 0: charIndex < unwantedSequence.length(): charlndex++) if (Characteris Whitespace(unwantedSequence.charAt(charIndex))) //ignore all subsequent white space: while (Character.is Whitespace(nextChar- (char)System in.read))

else /lensure each character matches the expected character in the sequence: nextChar (char)System in.read0; if (nextCharunwantedSequence.charAt(charIndex)) return null, input (new Character(nextChar).toString0; if (maxFieldLength-1) return input; whie (ICharacter.is Whitespace(nextChar-(char)System.in.read0) input nextChar. if (maxFieldLengthinput.length0) return input; return input