[SOLVED] EIE2111 Lab 2 Introduction to Classes and Objects C/C

Department of Electronic and Information Engineering

EIE2111 Lab 2: Introduction to Classes and Objects

(Deadline for Submission: Check the course information)

Introduction

This laboratory exercise is designed to give you hand-on experience in Classes and Objects.

Part A: Develop your first class, GradeBook.

1.   Run the application software “Microsoft Visual Studio 2019” .

–    Choose and click “Visual Studio 2019”    from the program menu.

2.   Create a new project called Lab02PartA.

–     Select C++ under the “All languages” and click “Windows Desktop Wizard” .

–    Click the option “New” and then “Project” .

–    Type “Lab02PartA” in the field “Name” and then click the browse  button  “  ”  to  select  the  storage  location  e.g. “Desktop” .

–    Click the button “Create” . Select “Console Application” and “Empty Project” . Then, click the button “OK” (see the figure on the right hand side).

3.   Create a C++ program file called Lab02PartA.cpp.

–    Go to the window “Solution Explorer” and right click the folder “Source Files” .

–    Click the option “Add” and then “New Item …”.

Select “C++ file (.cpp)”, type “Lab02PartA.cpp” in the field “Name” and then click the button “Add” .

–    Type the following statements in the window “Lab02PartA.cpp” :

//Lab02PartA.cpp

//Name: <Replace with your Student Name>

#include <iostream> #include <string>

using namespace std;

class GradeBook {

public:

void displayMessage(string courseName) {

cout << “Welcome to the grade book for 
” << courseName << “!” << endl;

} };

int main() {

string nameOfCourse;

GradeBook myGradeBook;

cout << “Please enter the course name:” << endl; getline(cin, nameOfCourse);

cout << endl;

myGradeBook.displayMessage(nameOfCourse); }

4.   Compile the source file.

–    Goto the main menu. Click the option “Build” and then “Build Solution” . If there is no error, you should find the following message on the window “Output” (Fix any errors before you execute the program; alternatively, you may choose the option “Build” and then “Rebuild Solution” to delete all compiled files and compile the whole project again.):

========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

–    Goto the main menu. Click the option “Debug” and then “Start Without Debugging” (or Ctrl + F5). Then, type the highlighted text below and press “Enter” . You should find that the following window comes out to the screen:

 

5.   Create a C++ header file called GradeBook.h.

–    Go to the window “Solution Explorer” and right click the folder “Header Files” .

–    Click the option “Add” and then “New Item …”.

–    Select “Header File (.h)”, type “GradeBook.h” in the field “Name” and then click the button “Add” .

–    Cut and paste the following statements from “Lab02PartA.cpp” to “GradeBook.h” :

#include <string>

using namespace std;

class GradeBook {

public:

void displayMessage(string courseName)

{

cout << “Welcome to the grade book for 
” << courseName << “!” << endl;

} };

–    In “Lab02PartA.cpp”, add the following statement after “#include <iostream>”:

#include “GradeBook.h”

Compile the source file.

–      Goto the main menu. Click the option “Build” and then “Build Solution” . If there is no error, you should find the following message on the window “Output” (Fix any errors before you execute the program; alternatively, you may choose the option “Build” and then “Rebuild Solution” to delete all compiled files and compile the whole project again.):

========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

–    Goto the main menu. Click the option “Debug” and then “Start Without Debugging” (or Ctrl + F5). You should find that the following window comes out to the screen:

 

Part B: Develop your first static library, GradeBook.

1.   Run the application software “Microsoft Visual Studio 2019” .

–    Choose and click “Visual Studio 2019” from the program menu.

2.   Create a new project called GradeBook.

–    Select C++ under the “All languages” and click “Windows Desktop Wizard” .

–    Click the option “New” and then “Project” .

–    Type “GradeBook” in the field “Name” and then click the browse button “” to select the storage location e.g. “Desktop” .

–    Click the button “Create” .

–     Select “Static Library” and “Empty Project” . Then, click the button “OK” (see the figure on the right hand side).

3.   Create a C++ header file called GradeBook.h.

–    Go to the window “Solution Explorer” and right click the folder “Header Files” .

–    Click the option “Add” and then “New Item …”.

–    Select “Header File (.h)”, type “GradeBook.h” in the field “Name” and then click the button “Add” .

–    Type the following statements in the window “GradeBook.h” :

//GradeBook.h

#include <string>  using std::string;

class GradeBook

{

public:

GradeBook(string);

void setCourseName(string); string getCourseName();

void displayMessage();

private:

string courseName; };

4.   Compile the header file.

–    Goto the main menu. Click the option “Build” and then “Build Solution” . If there is no error, you should find the following message on the window “Output” (Fix any errors before you execute the program; alternatively, you may choose the option “Build” and then “Rebuild Solution” to delete all compiled files and compile the whole project again.):

========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

5.   Create a C++ source file called GradeBook.cpp.

–    Go to the window “Solution Explorer” and right click the folder “Header Files” .

–    Click the option “Add” and then “New Item …”.

–    Select “C++ file (.cpp)”, type “GradeBook.cpp” in the field “Name” and then click the button “Add” .

–    Type the following statements in the window “GradeBook.cpp” :

//GradeBook.cpp

//Name: <Replace with your student name>

//Student ID: <Replace with your student ID>

#include <iostream> using std::cout;

using std::endl;

#include “GradeBook.h”

GradeBook::GradeBook(string name) {

setCourseName(name); }

void GradeBook::setCourseName(string name) {

courseName = name; }

string GradeBook::getCourseName() {

return courseName; }

void GradeBook::displayMessage() {

cout << “Welcome to the gradebook for
” << getCourseName() << “!” <<

endl; }

6.   Compile the source file.

–    Goto the main menu. Click the option “Build” and then “Build Solution” . If there is no error, you should find the following message on the window “Output” (Fix any errors before you execute the program; alternatively, you may choose the option “Build” and then “Rebuild Solution” to delete all compiled files and compile the whole project again.):

========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

Go to the project directory and then the sub-directory “Debug”, you will find that you create an object file called GradeBook.lib (see the figure below). We call the object file as a static library.

 

7.   Create anew project called GradeBookTest.

–    Select C++ under the “All languages” and click “Windows Desktop Wizard” .

–    Click the option “New” and then “Project” .

–    Type “GradeBookTest” in the field “Name” and then click the browse button “” to select the storage location e.g. “Desktop” .

–    Click the button “Create” . Select “Console Application” and “Empty Project” . Then, click the button “OK” .

8.   Create a C++ source file called GradeBookTest.cpp.

–    Go to the window “Solution Explorer” and right click the folder “Source Files” .

–    Click the option “Add” and then “New Item …”.

–    Select “C++ File (.cpp)”, type “GradeBookTest.cpp” in the field “Name” and then click the button “Add” .

–    Type the following statements in the window “GradeBookTest.cpp” :

//GradeBookTest.cpp

//Name: <Replace by your student name>

//Student ID: <Replace by your student ID>

#include <iostream> using std::cout;

using std::endl;

#include “GradeBook.h”

int main() {

GradeBook gradeBook1(“CS101 Introduction to C++ Programming”); GradeBook gradeBook2(“CS102 Data Structures in C++”);

cout << “gradeBook1 created for course: ” << gradeBook1.getCourseName()  << ”
gradeBook2 created for course: ” << gradeBook2.getCourseName() << endl;

return 0; }

9.   Use  “File  Explorer”  to  copy  the  files  “GradeBook.h”  and  “GradeBook.lib”  from  previous

GradeBook project folder to the working directory with “GradeBookTest.cpp” .

 

10. Add these two files into the project “GradeBookTest” .

–    Go to the window “Solution Explorer” and right click the folder “Source Files” .

–    Click the option “Add” and then “Existing Item …”.

–    Select “GradeBook.h” and “GradeBook.lib” and then click the button “Add” .

11. Compile and execute the program.

–    Goto the main menu. Click the option “Build” and then “Build Solution” . If there is no error, you should find the following message on the window “Output” (Fix any errors before you execute the program; alternatively, you may choose the option “Build” and then “Rebuild Solution” to delete all compiled files and compile the whole project again.):

========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

–    Goto the main menu. Click the option “Debug” and then “Start Without Debugging” (or Ctrl + F5). You should find that the following window comes out to the screen:

 

Part C: Develop your C++ programs with classes and objects. Create a class called “Account”

1.   Create a header file Account.h which includes a class called Account.

2.   A bank uses the class Account to represent customers ’ bank accounts. Your class should include one data member of type  int to represent the account balance. Your class should provide a constructor  that  receives  an  initial  balance  and  uses  it  to  initialize  the  data  member.  The constructor should validate the initial balance to ensure that it is greater than or equal to 0. If not, the balance should be set to 0 and the constructor should display an error message, indicating that the initial balance was  invalid. The  class  should provide three member  functions. Member function credit should add an amount to the current balance. Member function debit should withdraw money from the Account and should ensure that the debit amount does not exceed the Account’s balance. If it does, the balance should be left unchanged and the function should print a message indicating “Debit amount exceeded account balance.”. Member function getBalance should return the current balance.

Create a class called “Invoice”

3.   Create a header file Invoice.h which includes a class called Invoice.

4.   A hardware core uses the class Invoice to represent an invoice for an item sold at the store. An Invoice should include four pieces of information as data members — a part number (type string), apart 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 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.

5.   You have to create two static libraries for two classes Account and  Invoice for the test program in step 6.

6.   The following main program can be used to test two classes Account and Invoice:

//Name: <Replace with your student name>

//Student ID: <Replace with your student ID>

#include <iostream> using std::cout;

using std::endl;

#include “Account.h” #include “Invoice.h”

int main() {

Account myAccount1(100); Account myAccount2(-10);

cout << “myAccount1: Balance = $” << myAccount1.getBalance() << endl; cout << endl;

cout << “Deposit $100 into the account.” << endl; myAccount1.credit(100);

cout << “myAccount1: Balance = $” << myAccount1.getBalance() << endl; cout << endl;

cout << “Withdraw $500 from the account.” << endl; myAccount1.debit(500);

cout << “myAccount1: Balance = $” << myAccount1.getBalance() << endl; cout << endl;

cout << “Withdraw $50 from the account.” << endl; myAccount1.debit(50);

cout << “myAccount1: Balance = $” << myAccount1.getBalance() << endl; cout << endl;

Invoice myInvoice(“12345”, “Hammer”, 100, 5);

cout << “Part number: ” << myInvoice.getPartNumber() << endl;

cout << “Part description: ” << myInvoice.getPartDescription() << endl; cout << “Quantity: ” << myInvoice.getQuantity() << endl;

cout << “Price per item: $” << myInvoice.getPricePerItem() << endl;  cout << “Invoice amount: $” << myInvoice.getInvoiceAmount() << endl; cout << endl;

myInvoice.setPartNumber( “123456” );

myInvoice.setPartDescription( “Saw” ); myInvoice.setQuantity( -5 );

myInvoice.setQuantity( 5 );

myInvoice.setPricePerItem( -10 ); myInvoice.setPricePerItem( 10 );  cout << endl;

cout << “After modification, ” << endl;

cout << “Part number: ” << myInvoice.getPartNumber() << endl;

cout << “Part description: ” << myInvoice.getPartDescription() << endl; cout << “Quantity: ” << myInvoice.getQuantity() << endl;

cout << “Price per item: $” << myInvoice.getPricePerItem() << endl;  cout << “Invoice amount: $” << myInvoice.getInvoiceAmount() << endl;

return 0; }

The output of the above test program is listed below:

 

Instructions

a.  You are required to submit ALL your C++ programs (i.e. whole project folders with source code inside; each project is stored inside a single folder which is created by Microsoft Visual Studio 2019) in Part A, B and C to Blackboard. Use Zip or 7-Zip to compress all of them into a single file. Pleaseadd your student name & ID as a comment (e.g. //Student Name/ID: XXX XXX) at the beginning of each .cpp file. Remember to close any output window and Visual Studio before compression and submission.

b.  The deadline of the submission: Check the course information.