Answers to Review Questions

Solu�ons Manual for Advanced Visual Basic

2010, 5

th Edi�on By Kip Irvine, Tony Gaddis (All Chapters, 100% Original Verified, A+ Grade) Visual Basic Program Files Download Link at The End of This File. 1 / 3

Page 1 Answers to Review Questions Advanced Visual Basic 2010, 5 th Edition, by Kip Irvine and Tony Gaddis Copyright © 2012, 2007 Pearson Education, Inc., publishing as Addison-Wesley. All rights reserved. If you have questions or corrections relating to this document, please

send them to: [email protected].

Last update: March 4, 2011

Chapter 1: Classes

True or False

• False

2.True

• False
• False
• False

6.True

• False
• False

9.True 10.True 11.False Short Answer

1.No, you can write: If isFullTime Then . . .

• Presentation tier

3.As class methods

• Middle (business logic) tier

5.At runtime, when multiple instances of the class exist, no more than a single copy of a shared variable exists. In contrast, each instance of the class will contain its own copy of a non-shared va riable.

6.Shared property:

class Window Public Shared Property Color as String

7. Declaring the MyMethod method:

Sub MyMethod(ByRef str As String)

• Information hiding (encapsulation)

9.Create public properties that ge t and set the variable's value. 2 / 3

Page 2

10. Constructor with optional parameters:

Class Hero Public Sub New(Optional ByVal pStrength As Integer = 0, Optional ByVal pIntelligence As Integer = 0) Strength = pStrength Intelligence = pIntelligence End Sub

• The Set section is omitted.
• The Clone method.
• Right-click the project name in the Solution Explorer window, select Add, and select Class.

14. Variable declaration:

Private Shared smDefaultColor As String

• Parameterized constructor

16. Opening a text file for input:

Dim reader As StreamReader = OpenText("myfile.dat")

• Read from StreamReader

Dim line As String = reader.ReadLine()

• EndOfStream property

What Do You Think?

• You must use a subscript when inserting the items in the target array. But you can use a For

Each loop to access the source array:

Dim index As Integer = 0 Dim target(Names.Length-1) As String For Each nam As String in Source target(j) = nam j += 1 Next

• Because the Clone method returns an array of type Object, which cannot be directly

assigned to a specific array type.

• When the different instances of the class need to access a shared value. The default

background color for windows is a good example.

• Because the middle tier might be accessed by Web applications, Windows forms

applications, or other specialized application types.

• Because the parameter names hide the class-level variables, a technique called masking.
• Because it might not be appropriate to create an instance of the class without assigning it

custom values (such as ID number).

• It stores a message string in the LastError property and returns a value of False. It might be

better to throw an exception, which forces the calling method to acknowledge the error.Algorithm Workbench

• Property
• / 3