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(Invoice Class) Create a class called Invoice that a hardware store might use to represent an invoice for an item sold at the store. An Invoice should include four pieces of information as data membersa part number (type string \(),\) a part description (type string), a quantity of the item being purchased (type int) and a price per item (type int). [Note: In subsequent chapters, we'll use numbers that contain decimal points (e.g., 2.75 )called floating- point valuesto represent dollar amounts.] Your class should have a constructor that initializes the four data members. Provide a set and a get function for each data member. In addition, provide a member function named getInvoiceAmount that calculates the invoice amount (i.e., multiplies the quantity by the price per item), then returns the amount as an int value. If the quantity is not positive, it should be set to \(\theta\). If the price per item is not positive, it should be set to \(\theta .\) Write a test program that demonstrates class Invoice's capabilities.

(Date Class) Create a class called oate that includes three pieces of information as data membersa month (type int), a day (type int) and a year (type int). Your class should have a constructor with three parameters that uses the parameters to initialize the three data members. For the purpose of this exercise, assume that the values provided for the year and day are correct, but ensure that the month value is in the range 112 ; if it is not, set the month to \(1 .\) Provide a set and a get function for each data member. Provide a member function displayoate that displays the month, day and year separated by forward slashes ( \(/\) ). Write a test program that demonstrates class bate's capabilities.