Initializing Objects with constructors

[freddyvorhees]

Im very new to C++ and so im stuck. Im trying to do a problem and Im really curious how to solve it 

3.11 (Modifying Class GradeBook) Modify class GradeBook (Figs. 3.113.12) as follows:

Include a second string data member that represents the course instructor's name.

Provide a set function to change the instructor's name and a get function to retrieve it.

Modify the constructor to specify two parametersone for the course name and one for the instructor's name.

Modify member function displayMessage such that it first outputs the welcome message and course name, then outputs "This course is presented by: " followed by the instructor's name.

3.11

 5  #include <string> // class GradeBook uses C++ standard string class
 6  using std::string;
 7
 8  // GradeBook class definition
 9  class GradeBook
10  {
11  public:
12     GradeBook( string ); // constructor that initializes courseName    
13     void setCourseName( string ); // function that sets the course name
14     string getCourseName(); // function that gets the course name      
15     void displayMessage(); // function that displays a welcome message 
16  private:
17     string courseName; // course name for this GradeBook
18  }; // end class GradeBook


3.12

 4  #include <iostream>
 5  using std::cout;
 6  using std::endl;
 7
 8  #include "GradeBook.h" // include definition of class GradeBook
 9
10  // constructor initializes courseName with string supplied as argument
11  GradeBook::GradeBook( string name )
12  {
13     setCourseName( name ); // call set function to initialize courseName
14  } // end GradeBook constructor
15
16  // function to set the course name
17  void GradeBook::setCourseName( string name )
18  {
19     courseName = name; // store the course name in the object
20  } // end function setCourseName
21
22  // function to get the course name
23  string GradeBook::getCourseName()
24  {
25     return courseName; // return object's courseName
26  } // end function getCourseName
27
28  // display a welcome message to the GradeBook user
29  void GradeBook::displayMessage()
30  {
31     // call getCourseName to get the courseName
32     cout << "Welcome to the grade book for\n" << getCourseName()
33        << "!" << endl;
34  }

If you can show me how to do this I would really appreciate it, an can you please include an explanation thats what i needed the most,and can you make it light on the terms(lol).

Thanks!!!

[matsp]

1. Use CODE tags only around your code.
2. Can you, instead of just posting your assignment, please provide us with a distinct question as to what part you are stuck on?

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Mats