Date: Thu, 27 Jul 2006 17:26:01 -0500 (CDT)
   From: Mark Jacobson <jacobson@math-cs.cns.uni.edu>
     To: 810-030-01@uni.edu
Subject: Part Three Study Guide...

Hi VB students,

    Here is the last portion of the study guide for the final exam...

    18.  Be able to use a cbo ComboBox or a lst ListBox and its
         Items() collection with a For Next loop....

         Example:

         Write the code to place all of the contents of array colors()
         into cboColors ComboBox.  Assume that there are 10 colors
         stored in the colors() array, i.e.

         Dim colors(10) As String

         ANSWER:

         for i as integer = 1 to 10

            cboColors.Items.Add( colors(i) )

         next i

    19.  Be able to modify some code to do slightly different
         pattern, such as the example I gave you yesterday in class where
         you had the code to do some squares, and I wanted you to modify
         it to do

                  rectangles that were 3 times as wide as they were tall.

         You will be given the code for any graphics and would just
         have to modify it and adapt it for different output.

         Here is the solution to yesterday's (after you modify it to do
               rectangles instead of squares, by using 3 * i, etc..

Private Sub Form1_Click( sender... , e... ) Handles Me.Click
         Dim draw As System.Drawing.Graphics
         Dim rect As Rectangle
         Dim brush As SolidBrush

         draw = Me.CreateGraphics
         brush = New SolidBrush(Color.Purple)

         rect = New Rectangle(0, 0, 10, 10)

         For i As Integer = 5 To 100 Step 5
             rect.Width = 3 * i                   <--------------- 3 times i
             rect.Height = i

             draw.FillRectangle(brush, rect)

             brush.Color = Color.FromArgb(Rnd() * 255, Rnd() * 255, Rnd() * 255)

             rect.X = rect.X + 3 * i              <--------------- 3 times i
             rect.Y = rect.Y + i
         Next
End Sub

    20.  Global versus Local variables.

         Do not worry about Static variables (see previous study guide
         for midterm).      ------

         What I call Global variables are also called Form level variables.
         They are declared outside of any Sub or Function, usually at the
         beginning of the entire Form or Class code.

         They are available to ALL of the functions and subs.

    21.  WebBrowser control.

         .Navigate() method
         .Navigated() method
         .DocumentTitle property

    22.  Know the difference between ByRef and ByVal for parameters
         with Functions or with Subs.

         Sub SwapHasABug(ByVal x as Integer, ByVal y As Integer)
             Dim temp As Integer

             temp = x
             x = y
             y = temp

         End Sub

         What is wrong with the ABOVE SwapHasABug() procedure????
         Explain why it won't work and draw a picture if that helps
         to explain the difference between passing arguments By Value
         and passing arguments By Reference.                 -- ---
                               -- ---

         Correct it and rename it SwapOK() please:

         SwapOK ANSWER:

         Sub SwapOK(ByRef x as Integer, ByRef y As Integer)
             Dim temp As Integer

             temp = x
             x = y
             y = temp

         End Sub

   END OF STUDY GUIDE - be sure to look at Part I and Part II too!!!

   See you at the final exam.

   Mark