Chapter 8, Problem 11PP

Program Plan Intro

Program plan:

CashRegister.java:

• Define a class named “CashRegister” and track the total price as an integer to avoid roundoff errors.
  • Declare an integer variable named “itemCount”.
  • Declare an integer variable named “totalPrice”.
  • Create a constructor named “CashRegister” and assign the value of variables “itemCount” and “totalPrice” as “0”
  • Define a function named “addItem” and calculate the “totalPrice” as an integer and increment the “itemCount” variable.
  • Define a function named “getTotal”.
    • Using “getTotal” retrieve and return the “totalPrice” of the current sale.
  • Define a function named “getCount”
    • Using the “getCount” method, retrieve and return the “itemCount” of the number of items.
  • Define a function named “clear”.
    • Using the “clear()” method, clear the garbage values of  “itemCount” and “totalPrice”.

CashRegisterTest.java:

• Define another class named “CashRegisterTest” and the keyword “extends” indicates that a class is inherited from another class named “CashRegister”.
  • Define a main function.
    • Create an object named “register1” of another class “CashRegister”.
    • Call the function “clear()”and remove all the garbage values from the “register1” object.
    • Call the function “addItem()”and add the values to the object “register1”.
    • Call the function “getCount()” and print the number of items in the current sale.
    • Call the function “getTotal()” and display the total of all items.