// Fig. 5.7: GradeBookTest.cs
// Create GradeBook object and invoke its DetermineClassAverage method.
public class GradeBookTest
{
    public static void Main(string[] args)
    {
        // create GradeBook object myGradeBook and 
        // pass course name to constructor
        GradeBook myGradeBook = new GradeBook(
           "IT 528 – Developing .NET Applications Using C#");

        myGradeBook.DisplayMessage(); // display welcome message
        myGradeBook.DetermineClassAverage(); // find average of 10 grades
    } // end Main
} // end class GradeBookTest