I am really struggling to understand this problem! Can someone show how to work this problem out cor

I am really struggling to understand this problem! Can someone show how to work this problem out correctly? This is a C++ problem; I am using Code::Blocks; Course Name is: Introduction to Engineering and Computing; Instructor Name: Wenbin Luo

3.13 (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 data members—a 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 values—to represent dollar amounts.] Your class should have a constructor that initializes the four data members. A constructor that receives multiple arguments is defined with the form:

ClassName( TypeName1 parameterName1 , TypeName2 parameterName2 , … )

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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 0. If the price per item is not positive, it should be set to 0. Write a test program that demonstrates class Invoice’s capabilities.

 

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