Question

1. Include a second string auto-implemented property that represents the name of the course’s instructor.
2. Modify the constructor to specify two parameters—one for the course name and one for the instructor’s name.
3. Modify method 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.

Use your modified class in a test app that demonstrates the class’s new capabilities. NOTE: You will need both a GradeBook file and a GradeBookTest file.

The code from GradeBookTest.cs is:

// Exercise 4.10 Solution: GradeBookTest.cs
// GradeBook constructor used to specify the course name  
// and instructor name at the time each GradeBook object is created.
using System;

public class GradeBookTest
{
   // Main method begins program execution
   public static void Main( string[] args )
   {
      // create GradeBook object
      GradeBook gradeBook1 = new GradeBook(
         "CS101 Introduction to C# Programming", "Sam Smith" );

      gradeBook1.DisplayMessage(); // display welcome message

    Console.WriteLine( "\nChanging instructor name to Judy Jones\n" );
      gradeBook1.InstructorName = "Judy Jones";

      gradeBook1.DisplayMessage(); // display welcome message
   } // end Main
} // end class GradeBookTest

Answer 1

//GradeBook.cs

using System;

class GradeBook

{

public string title;

public string InstructorName;

public GradeBook(string tit,string aut)

{

title=tit;

InstructorName=aut;

}

public void DisplayMessage()

{

Console.WriteLine("#########Welcome#########");

Console.WriteLine("Course name: "+title);

Console.WriteLine("This course is presented by: "+InstructorName);

}

}

==========================================================================

using System;

public class GradeBookTest

{

// Main method begins program execution

public static void Main( string[] args )

{

// create GradeBook object

GradeBook gradeBook1 = new GradeBook(

"CS101 Introduction to C# Programming", "Sam Smith" );

gradeBook1.DisplayMessage(); // display welcome message

Console.WriteLine( "\nChanging instructor name to Judy Jones\n" );

gradeBook1.InstructorName = "Judy Jones";

gradeBook1.DisplayMessage(); // display welcome message

} // end Main

} // end class GradeBookTest

================================

//Output

#########Welcome#########
Course name: CS101 Introduction to C# Programming
This course is presented by: Sam Smith

Changing instructor name to Judy Jones

#########Welcome#########
Course name: CS101 Introduction to C# Programming
This course is presented by: Judy Jones