Deck 3: Variables and Calculations

Question 1

The control is used to gather input the user has typed at the keyboard.

A) Label
B) Button
C) TextBox
D) ListBox

Answer 1

C

Question 2

What is the result after evaluating the following expression: 24 MOD 9

A) 6
B) 3
C) 2
D) 5

Answer 2

A

Question 3

What will be assigned to the label when the following statements execute? Dim dblVal As Double = 11.75
LblResult.Text = dblVal.ToString("n3")

A) $11.75
B) 11.75
C) 11.750
D) 12

Answer 3

C

Question 4

The order in which controls receive the focus is called the __________.

A) control order
B) tab order
C) sequence order
D) focus order

Question 5

Which of the following statements will assign the contents of a TextBox control named txtInput into the Text property of a Label control named lblDisplay?

A) txtInput = lblDisplay
B) txtInput.Text = lblDisplay.Text
C) lblDisplay = txtInput
D) lblDisplay.Text = txtInput.Text

Question 6

A keyboard access key is assigned to a button using the button control's ______property.

A) ShortCut
B) Text
C) AccessKey
D) Alt

Question 7

A Date literal can contain _____________.

A) a date
B) a time
C) a floating-point value
D) both a date and a time

Question 8

The operator performs string concatenation.

A) ampersand (&)
B) dollar sign ($)
C) percent symbol (%)
D) pound symbol (#)

Question 9

You can break up a long statement into multiple lines as long as you don't break up a __________.

A) keyword
B) quoted string
C) variable name
D) all of the above

Question 10

It's possible to view the order in which all controls on a form will receive the focus by __________.

A) clicking TabOrder in the Properties window
B) pressing the Esc key
C) clicking View on the menu bar and then Tab Order
D) all of the above

Question 11

If you want to display multiple lines of information in a message box, use the constant .

A) ControlChars.CrLf
B) strNEW_LINE
C) CARRAGE_RETURN_LINE_FEED
D) vbReturn

Question 12

You can perform all of the following actions with variables except:

A) Copy and store values entered by the user, so they may be manipulated
B) Assign a variable's value to a constant
C) Perform arithmetic on values
D) Remember information for later use in the program

Question 13

Only controls capable of receiving some sort of input, such as _________________, may have the focus.

A) labels
B) text boxes
C) buttons
D) text boxes and buttons

Question 14

All of the following are advantages of using named constants except

A) they can be used in the place of keywords.
B) it is easier to make a consistent change throughout a program.
C) they help make the program more self documenting.
D) they're useful for common values such as pi.

Question 15

All numeric and date data types have a ______method that returns a string representation of the contents of the variable.

A) Convert
B) String
C) ToString
D) ToText

Question 16

The contents of a text box may be cleared in Visual Basic code by __________.

A) by assigning the predefined constant String.Empty to the text property
B) by setting the focus on the control and using the delete key
C) by setting the focus on the control and using the back space key
D) by clicking the clear button

Question 17

When you assign a value of one data type to a variable of another data type, Visual Basic attempts to perform _____type conversion.

A) string
B) explicit
C) implicit
D) numeric

Question 18

In order to execute code before a form is displayed, place the code in the form's ______event handler.

A) SetUp
B) Load
C) Focus
D) Initialize

Question 19

The statement to declare strName as a variable that can hold character data is _______________.

A) Dim strName As Text
B) Dim strName As Single
C) Dim strName As Word
D) Dim strName As String

Question 20

The value returned by passing #12/31/10# to the CSng function is_________________

A) 12/31/2010
B) 123,110
C) 0
D) No value is returned. A runtime error is generated.

Question 21

Identify the error in the following code: Private Sub btnCalculate_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnCalculate.Click
' Declare some variables
Dim sngNumber1 As Single
Dim sngNumber2 As Single
Dim sngSum As Single
' Get the two numbers
SngNumber1 = txtNumber1.Text
SngNumber2 = txtNumber2.Text
' Calculate their sngSum... is the next line working?
SngSum = sngNumber1 + sngNumber2
' Display the result
LblSum.Text = sngSum.ToString
End Sub

A) A local variable is misplaced.
B) A conversion function such as CSng was not used.
C) The variable name sngNumberl was misspelled.
D) The variable sngSum was declared as the wrong data type.

Question 22

Which statement is true regarding the CInt function?

A) It converts letters to numbers.
B) It cannot convert a string such as "24.7" to an integer.
C) A floating-point number such as 24.7 is converted to 24, dropping its decimal positions.
D) A floating-point number such as 24.7 is converted to 25, rounding its decimal positions.

Question 23

Which of the following is not a valid Visual Basic data type?

A) Integer
B) Number
C) Decimal
D) Short

Question 24

What is the purpose of using the following type of structure? Try
Some statements
Catch
Other Statements
End Try

A) To try different types of commands to see which will give you the correct answer.
B) In order to catch run-time errors such as divide-by-zero and not have the program shut down.
C) This is not a valid structure.
D) To use for temporary debugging and remove later when the program functions properly.

Question 25

When you declare a constant, you must assign it an initial value.

Question 26

What will be the value of intAnswer after execution of these statements? Const intNumA As Integer = 6
Const intNumB As Integer = 2
IntAnswer = intNumA / intNumB + intNumA * intNumB

A) 12
B) 15
C) 16
D) 18

Question 27

Which of the following has the highest order of precedence in arithmetic expressions?

A) Multiplication and division
B) Addition and subtraction
C) Exponentiation (the ^ operator)
D) None of the above; calculations are always evaluated from left to right.

Question 28

Which will be displayed in the label lblResult following execution of the code below? Dim dblGrossPay as Double
DblGrossPay = 3500
LblResult.Text = dblGrossPay.ToString("c")

A) 3500.00
B) 3500
C) $3500.00
D) $3,500.00

Question 29

What is the value of intE after the following statements execute? Dim intC As Integer
Dim intD As Integer
Dim intE As Integer
IntC = 20
IntD = 3
IntE = intC \ intD

A) 7
B) 6
C) 6.666667
D) 0

Question 30

When included in the Text property of a button, the && symbols placed side by side will display as a single & character.

Question 31

Declaration statements ___________________.

A) are only used for variables and are not needed for constants
B) are only allowed in the Declarations section of a form
C) give a name to variables or constants and specify the type of data they will hold
D) both answers B and C are correct

Question 32

A variable is a storage location on a computer's hard drive that holds information while the computer is off.

Question 33

Which of the following declares a variable that can store the first name of a student?

A) Dim strFirstName as Char
B) Dim strFirstName as Short
C) Dim strFirstName as Long
D) Dim strFirstName as String

Question 34

Which of the following declares an Integer variable named intLength and assigns it the integer literal 12?

A) Dim intLength As Integer initialize to 12
B) Dim intLength = 12 As Integer
C) Dim intLength As Integer = 12
D) Dim intLength As Integer 12

Question 35

A Boolean type variable can hold only one of two possible values: _____________.
Or False
B) 0 or 1
C) A or B
D) −1 or +1

Question 36

Variables declared within a button's Click event handler are ________variables.

A) local
B) String
C) global
D) private

Question 37

Which of the following is not true in regard to naming variables?

A) Names may contain underscores.
B) Names may contain letters.
C) Names may contain digits.
D) Names may contain spaces.

Question 38

What is the value of dblOutcome after the following section of code executes? Dim dblA as Double
Dim dblB as Double
Dim dblC as Double
Dim dblOutcome as Double
DblA = 45
DblB = 30
DblC = 3 * dblA / dblB
DblOutcome = 2 * (dblC + 15)

A) 39
B) 24
C) 0
D) 80

Question 39

Which of the following declares a variable named intIndex that will be used to store whole numbers?

A) Dim intIndex As WholeNumber
B) Dim intIndex As String
C) Dim Integer As intIndex
D) Dim intIndex As Integer

Question 40

A form's Load event takes place when the user first clicks on the form at run time.

Question 41

A class-level variable ___________________.

A) is declared inside a class but outside any procedure
B) is accessible to all procedures in a class
C) is visible to all statements inside the class
D) all of the above