Question

Please help with this assignment. Thanks.

1. Write a C++ program containing a class Invoice and a driver program called invoiceDriver.cpp. The class Invoice is used in a hardware store to represent an invoice for an item sold at the store. An invoice class should include the following: A part number of type string A part description of type string A quantity of the item being purchased of type int A price per item of type int A class constructor that initializes the four data members An accessor (e.g. get member function) for each of the data member A mutator (i.e., a set member function) for each of the data member A member function named getInvoiceAmount that calculates the invoice amount i.e., multiplies the quantity by the price per item, then it returns the amount as an int value The constructor and the mutators functions should take into account the following conditions: i. If the quantity is not positive, it should be set to 0 ii. If the price per item is not positive, it should be set to 0 Write a test program Invoice Driver.cpp that demonstrates the capabilities of the class Invoice. Do the following:

Answer 1

I have written three programs.

Invoice.h has only declarations of data members and functions.

invoice.cpp has the definitions of these functions.

InvoiceDriver.cpp is the test program.

Invoice.h:

#include <iostream>
#include <string>

using namespace std;

class Invoice
{
public:
       Invoice(string p_number, string p_description, int quantity, int price) ;
       void setPartNumber( string ); // part number
       string getPartNumber();  
      
       void setPartDescription( string ); // part description
       string getPartDescription();
      
       void setQuantity( int ); // quantity
       int getQuantity();
      
       void setPricePerItem( int ); // price per item
       int getPricePerItem();
      
       int getInvoiceAmount() ;

private:
       string partNumber;
           string partDescription;
           int quantity;
           int pricePerItem;
};
      

invoice.cpp

#include <iostream>
#include <string>
#include "Invoice.h"

using namespace std;
Invoice::Invoice ( string p_number, string p_desc, int quant, int price )
{
   setPartNumber (p_number);
   setPartDescription (p_desc);
   setQuantity (quant);
   setPricePerItem (price);
}

void Invoice::setPartNumber (string number)
{
   partNumber = number;
}

string Invoice::getPartNumber ()
{
   return partNumber;
}

void Invoice::setPartDescription (string desc)
{
   partDescription = desc;
}

string Invoice::getPartDescription()
{
   return partDescription;
}

void Invoice::setQuantity (int quant)
{
   if (quant >= 0) {
   quantity = quant; }
   else quantity = 0;
}

int Invoice::getQuantity()
{
   return quantity;
}

void Invoice::setPricePerItem(int price)
{
   if (price >= 0) pricePerItem = price;
   else pricePerItem = 0;
}

int Invoice::getPricePerItem()
{
   return pricePerItem;
}

int Invoice::getInvoiceAmount()
{
  
   return quantity * pricePerItem;
}

InvoiceDriver.cpp

#include <string.h>
#include <iostream>
#include "Invoice.h"

using namespace std;

int main()
{
   Invoice invoiceObj1("P1111","item1",4,200);
   Invoice   invoiceObj2("P2222","item2",-2,50);
  
   // test getquantity and getprice functions
   int q1 = invoiceObj1.getQuantity();
   int p1 = invoiceObj1.getPricePerItem();
  
   int q2 = invoiceObj2.getQuantity();
   int p2 = invoiceObj2.getPricePerItem();
  
  
   cout << "Price per item1 = " << p1 << "\t Price per item2 = " << p2 << endl;
   cout << "Quantity1 = " << q1 << "\t Quantity2 = " << q2 << endl;
  
  
   // test getInvoiceAmount function
   cout << " Total Amount = " << invoiceObj1.getInvoiceAmount() << endl;
   cout << " Total Amount = " << invoiceObj2.getInvoiceAmount() << endl;
  
   // test set functions
  
   invoiceObj1.setPartNumber("S0001");
   invoiceObj1.setPartDescription("set item1");
   invoiceObj1.setPricePerItem(100);
   invoiceObj1.setQuantity(5);
  
   cout << "Part number = " << invoiceObj1.getPartNumber() << endl;
   cout << "Part description is " << invoiceObj1.getPartDescription() <<endl;
   cout << "Price per item = " << invoiceObj1.getPricePerItem() << endl;
   cout << "Quantity = " << invoiceObj1.getQuantity() << endl;
   cout << " Total Amount = " << invoiceObj1.getInvoiceAmount() << endl;
  
}

OUTPUT:

Price per item1 = 200    Price per item2 = 50
Quantity1 = 4    Quantity2 = 0
 Total Amount = 800
 Total Amount = 0
Part number = S0001
Part description is set item1
Price per item = 100
Quantity = 5
 Total Amount = 500

Hope this helps. Please Upvote .