Modify class GradeBook (GradeBook.cpp, and GradeBook.h) (attached) as follows: a
ID: 3878554 • Letter: M
Question
Modify class GradeBook (GradeBook.cpp, and GradeBook.h) (attached) as follows:
a) Include a second private data member instructorName in the GradeBook class. It represents the course instructor’s name. The data type of the instructorName is a string.
b) Create a new setInstructorName function in the GradeBook class. The function sets the instructor name. It accepts a string argument and does not return anything.
c) Create a new getInstructorName function in the GradeBook class. The function retrieves the instructor name. It does not accept any argument and returns one string data.
d) Modify the constructor to accept two parameters—one for the course name and one for the instructor’s name.
d) Modify member function displayMessage such that it will display the welcome message and course name, then outputs "This course is presented by: " followed by the instructor’s name.
e) Adjust all the necessary statements in the GradeBook.cpp file to display the required space(s) and line space(s).
// GradeBook.cpp
// GradeBook member-function definitions. This file contains
// implementations of the member functions prototyped in GradeBook.h.
#include <iostream>
#include "GradeBook.h" // include definition of class GradeBook
using namespace std;
// constructor initializes courseName with string supplied as argument
GradeBook::GradeBook( string name )
: courseName( name ) // member initializer to initialize courseName
{
// empty body
} // end GradeBook constructor
// function to set the course name
void GradeBook::setCourseName( string name )
{
courseName = name; // store the course name in the object
} // end function setCourseName
// function to get the course name
string GradeBook::getCourseName() const
{
return courseName; // return object's courseName
} // end function getCourseName
// display a welcome message to the GradeBook user
void GradeBook::displayMessage() const
{
// call getCourseName to get the courseName
cout << "Welcome to the grade book for " << getCourseName()
<< "!" << endl;
} // end function displayMessage
// GradeBook.h
// GradeBook class definition. This file presents GradeBook's public
// interface without revealing the implementations of GradeBook's member
// functions, which are defined in GradeBook.cpp.
#include <string> // class GradeBook uses C++ standard string class
// GradeBook class definition
class GradeBook
{
public:
explicit GradeBook( std::string ); // constructor initialize courseName
void setCourseName( std::string ); // sets the course name
std::string getCourseName() const; // gets the course name
void displayMessage() const; // displays a welcome message
private:
std::string courseName; // course name for this GradeBook
}; // end class GradeBook
Explanation / Answer
// GradeBook.h
// GradeBook class definition. This file presents GradeBook's public
// interface without revealing the implementations of GradeBook's member
// functions, which are defined in GradeBook.cpp.
#include <string> // class GradeBook uses C++ standard string class
// GradeBook class definition
class GradeBook
{
public:
explicit GradeBook( std::string ); // constructor initialize courseName
void setCourseName( std::string ); // sets the course name
std::string getCourseName() const; // gets the course name
void setInstructorName( std::string ); // sets the instructor name
std::string getInstructorName() const; // gets the instructor name
void displayMessage() const; // displays a welcome message
private:
std::string courseName; // course name for this GradeBook
std:: string instructorName; // data member instructorName represents the course instructor’s name
}; // end class GradeBook
// GradeBook.cpp
// GradeBook member-function definitions. This file contains
// implementations of the member functions prototyped in GradeBook.h.
#include <iostream>
#include "GradeBook.h" // include definition of class GradeBook
using namespace std;
// constructor initializes courseName with string supplied as argument
GradeBook::GradeBook( string name, string insName ) : courseName( name ), instructorName( insName ) // member initializer to initialize courseName
{
// empty body
} // end GradeBook constructor
// function to set the course name
void GradeBook::setCourseName( string name )
{
courseName = name; // store the course name in the object
} // end function setCourseName
// function to set the instructor name
void GradeBook::setInstructorName( string name )
{
instructorName = name; // store the instructor name in the object
} // end function setInstructorName
// function to get the course name
string GradeBook::getCourseName() const
{
return courseName; // return object's courseName
} // end function getCourseName
// function to get the instructor name
string GradeBook::getInstructorName() const
{
return instructorName; // return object's instructorName
} // end function getInstructorName
// display a welcome message to the GradeBook user
void GradeBook::displayMessage() const
{
// call getCourseName to get the courseName
cout << "Welcome to the grade book for " << getCourseName() << "!" << endl;
cout << "This course is presented by: " << getInstructorName() << "." << endl;
} // end function displayMessage
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