13. 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, a part description, a quantity of the item being purchased and a price per item.

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C++ How to Program (8th Edition)

Chapter 3

Introduction to Classes, Objects and Strings

Exercise

Problem # 13: 

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). 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 get Invoice Amount 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.

#include<iostream>
#include <string>
using namespace std;

class Invoice
{
 public:
  Invoice( string, string, int, int );
  void setPartNumber( string );
  string getPartNumber();
  void setPartDescription(string);
  string getPartDescription();
  void setItemQuantity(int);
  int getItemQuantity();
  void setItemPrice(int);
  int getItemPrice();
  int getInvoiceAmount();
 private:
  string partNumber;
  string partDescription;
  int itemQuantity;
  int itemPrice;
};
Invoice::Invoice( string number, string description, int quantity, int price )
{
 partNumber=number;
 partDescription=description;
 if(quantity>0)
  itemQuantity=quantity;
 else
 {
  itemQuantity=0;
  cout<<"Initial quantity was invalid."<<endl;
 }
 if(price>0)
  itemPrice=price;
 else
 {
  itemPrice=0;
  cout<<"Initial price was invalid."<<endl;
 }
}
void Invoice::setPartNumber( string number)
{
 if ( number.length() <= 25 )
  partNumber = number;
 if ( number.length() > 25 )
 {
  partNumber = number.substr( 0, 25 );
  cout << "Name \"" << number <<"\" exceeds maximum length (25).\n"<< "Limiting partNumber to first 25 characters.\n" << endl;
 }
}
void Invoice::setPartDescription(string description )
{
 if ( description.length() <= 25 )
  partDescription = description;
 if ( description.length() > 25 )
 {
  partDescription = description.substr( 0, 25 );
  cout << "Name \"" << description <<"\" exceeds maximum length (25).\n"<< "Limiting partDescription to first 25 characters.\n" << endl;
 }
}
void Invoice::setItemQuantity(int quantity )
{
 if(quantity>0)
  itemQuantity=quantity;
 else
 {
  itemQuantity=0;
  cout<<"Initial quantity was invalid."<<endl;
 }
}
void Invoice::setItemPrice(int price )
{
 if(price>0)
  itemPrice=price;
 else
 {
  itemPrice=0;
  cout<<"Initial price was invalid."<<endl;
 }
}
string Invoice::getPartNumber()
{
 return partNumber;
}
string Invoice::getPartDescription()
{
 return partDescription;
}
int Invoice::getItemQuantity()
{
 return itemQuantity;
}
int Invoice::getItemPrice()
{
 return itemPrice;
}
int Invoice::getInvoiceAmount()
{
 return itemQuantity*itemPrice;
}
int main()
{
 Invoice Invoice1("ed34","Screw Guage",2,30);
 Invoice Invoice2("e322","Screws",10,3);
 cout << "Invoice1's initial part number is: "<< Invoice1.getPartNumber()<< "\nand part description is: "<< Invoice1.getPartDescription()<<endl;
 cout<< "quantity per item is: "<< Invoice1.getItemQuantity()<< "\nprice per item is: "<< Invoice1.getItemPrice()<< endl;
 cout<<"Invoice1's total amount is: "<<Invoice1.getInvoiceAmount()<<endl<<endl;
 cout << "Invoice2's initial part number is: "<< Invoice2.getPartNumber()<< "\nand part description is: "<< Invoice2.getPartDescription()<<endl;
 cout<< "quantity per item is: "<< Invoice2.getItemQuantity()<< "\nprice per item is: "<< Invoice2.getItemPrice()<< endl;
 cout<<"Invoice2's total amount is: "<<Invoice2.getInvoiceAmount()<<endl;
}

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Chapter 3

  1. Modify class GradeBook, Include a string data member for course instructor’s name, Provide a set function and a get function to change and retrieve it, Modify display Message to output the welcome message and course name.
  2. Create an Account class that a bank might use to represent customers bank accounts. Include a data member to represent the account balance. Provide three member functions. Member function credit should add an amount to the current balance. Member function debit should withdraw money from the Account. Member function get Balance should return the current balance.
  3. Create a class called Employee that includes three pieces of information as data members a first name, a last name and a monthly salary. Provide a set and a get function for each data member. Create two Employee objects and display each object’s yearly salary. Then give each Employee a 10 percent raise and display each Employee’s yearly salary again. 
  4. Create a class called Date that includes three pieces of information as data members a month, a day and a year. Provide a set and a get function for each data member. Provide a member function display Date that displays the month, day and year separated by forward slashes (/). 

 Chapter 2


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