Deck 6: The Repetition Structure

Question 1

If the stepValue is omitted when coding a For...Next statement,the stepValue is ____ at execution time.

A)-1
B)0
C)0.1
D)1

Answer 1

D

Question 2

The loop created by the For...Next statement is a ____ loop.

A)posttest
B)pretest
C)selection
D)sequential

Answer 2

B

Question 3

You can make a list box any size you want.

Answer 3

True

Question 4

Which of the following loop structures always executes at least once?

A)pretest
B)posttest
C)top-driven
D)selection

Question 5

The repetition programming structure is used to make decisions in a program.

Question 6

Like the condition in a selection structure,the condition in a loop must evaluate to either True or False.

Question 7

In either pretest or posttest loops,the controlling condition is evaluated with each repetition.

Question 8

In a Do...Loop statement,the keyword While indicates that the loop instructions should be processed while the condition is false.

Question 9

Which of the following statements adds the number stored in the decPrice variable to the number stored in the decSubtotal variable,and then assigns the result to the decSubtotal variable?

A)decSubtotal =+ decPrice
B)decPrice =+ decSubtotal
C)decSubtotal += decPrice
D)decPrice += decSubtotal

Question 10

The startValue in a For...Next loop structure may be omitted.

Question 11

In a pretest loop,the evaluation of the condition occurs after the instructions within the loop are processed.

Question 12

A counter is always incremented by a constant value.

Question 13

The symbol used to represent a loop condition on a flowchart is the ____ symbol.

A)diamond
B)rectangle
C)hexagon
D)parallelogram

Question 14

____ means assigning a beginning value to a counter or an accumulator.

A)Introducing
B)Initializing
C)Incrementing
D)Updating

Question 15

To leave a Do...Loop structure earlier than its full completion,you must execute a(n)____ statement.

A)End Do
B)Bypass
C)Leave
D)Exit Do

Question 16

A(n)____ is a numeric variable used for adding together something.

A)counter
B)updater
C)incrementer
D)accumulator

Question 17

The assignment statement that updates a counter or an accumulator is placed within the loop in a procedure.

Question 18

In a Do...Loop statement,a condition can be phrased as either a looping condition or a loop enter condition.

Question 19

Programmers use a(n)____ when they need the computer to repeatedly process one or more program instructions until some condition is met,at which time the ____ ends.

A)list box
B)loop
C)index
D)counter

Question 20

A ____ structure is also referred to as a loop.

A)selection
B)sequence
C)repetition
D)recursion

Question 21

A list box should contain a minimum of ____ item(s).

A)two
B)three
C)four
D)five

Question 22

The following code is not working properly.The message should display four times.What needs to be changed for the code to work properly? Do While intCounter < 5
MessageBox.Show("OK")
IntCounter = intCounter + 1
Loop

A)intCounter < 5 should be changed to intCounter = 5
B)intCounter < 5 should be changed to intCounter > 5
C)intCounter = 1 should be added before the Do statement
D)intCounter = 0 should be added before the Do statement

Question 23

Visual Basic's ____ class contains many methods that your applications can use to perform financial calculations.

A)Money
B)Monetary
C)Finance
D)Financial

Question 24

You use the ____ tool in the toolbox to add a list box to an interface.

A)LBox
B)ListBox
C)List
D)Box

Question 25

A(n)____ read is used to prepare or set up a loop.

A)priming
B)initialization
C)preparation
D)set up

Question 26

You can stop an endless loop by clicking Debug on the menu bar,and then clicking ____.

A)Stop Debugging
B)Cancel Debugging
C)Abort Debugging
D)End Debugging

Question 27

You should use a ____ control to provide keyboard access to a list box.

A)radio button
B)text
C)check box
D)label

Question 28

A unique number called a(n)____ identifies each item in a collection.

A)counter
B)index
C)accumulator
D)tracker

Question 29

Each time either the user or a statement selects an item in a list box,the list box's SelectedValueChanged and ____ events occur.

A)SelectedItemChanged
B)SelectionChanged
C)SelectedIndexChanged
D)ItemChanged

Question 30

You can use either the SelectedItem or ____ property to determine whether an item is selected in a list box.

A)Selection
B)SelectedIndex
C)ItemChoice
D)Items

Question 31

You can use a ____ to display a list of choices from which the user can select zero choices,one choice,or more than one choice.

A)list box
B)radio button group
C)check box
D)list

Question 32

The number of choices the user can select from a list box is controlled by the list box's ____ property.

A)Selection
B)Display
C)Control
D)SelectionMode

Question 33

Which of the following statements pauses program execution for 3 seconds?

A)System.Threading.Thread.Pause(300)
B)System.Threading.Thread.Sleep(300)
C)System.Threading.Thread.Pause(3000)
D)System.Threading.Thread.Sleep(3000)

Question 34

You can delay program execution using the ____ method.

A)Delay
B)Rest
C)Sleep
D)Break

Question 35

Which of the following statements selects the "blue" item,which appears fourth in the lstColor control?

A)lstColor.SelectedIndex = 3
B)lstColor.SelectedIndex = 4
C)lstColor.SelectedItem = 3
D)lstColor.SelectedItem = 4

Question 36

In a For...Next statement,if stepValue is positive,then startValue must be ____ endValue for the loop instructions to be processed.

A)less than
B)more than
C)less than or equal to
D)more than or equal to

Question 37

In a nested repetition structure,one loop,referred to as the ____ loop,is placed entirely within another loop,called the ____ loop.

A)inner, outer
B)primary, secondary
C)minor, major
D)dependent, independent

Question 38

The ____ method ensures that any code appearing before it that affects the interface's appearance is processed.

A)Process
B)Affect
C)Apply
D)Refresh

Question 39

How many times will the message display based on the counter being initialized to 0? intCounter = 0
Do While intCounter < 5
MessageBox.Show("OK")
IntCounter = intCounter + 1
Loop

A)zero
B)one
C)four
D)five

Question 40

Adding increments of a negative number is referred to as ____.

A)decrementing
B)initializing
C)deprocessing
D)negating

Question 41

Explain the purpose of priming and update reads in a program.

Question 42

What is an accumulator? What does it mean to initialize and update an accumulator in a program?

Question 43

Write two different Do...Loop clauses that stop the loop when the value in the intAmount is less than or equal to the value in the intLimit variable.Use the Until keyword in the first clause,and use the While keyword in the second clause.

Question 44

Explain the difference between a looping condition and a loop exit condition.

Question 45

What is the Refresh method? Write the syntax for this method.

Question 46

What is a list box? Provide two of the Windows standards for its use on a form.

Question 47

The strCode variable contains an uppercase letter.Write two different Do...Loop clauses that process the loop instructions as long as the value in the strCode variable is either A or B.Use the Until keyword in the first clause,and use the While keyword in the second clause.

Question 48

An application allows the user to enter a salary amount.The application should then calculate and display the possible bonuses based on that salary,using bonus rates of 3-6% in increments of .5%.
' displays bonus amounts using rates
' of 3% - 6% in increments of .5%
Dim dblSalary As Decimal
Dim decBonus As Decimal
TryParse(txtSalary.Text,decSalary)
lblBonus.Text = String.Empty
For decRate As Decimal = 0.03 To 0.06 Step 0.5
decBonus = decSalary + decRate
lblBonus.Text = lblBonus.Text & decRate.ToString("P1")& " " & decBonus.ToString("C2")& ControlChars.NewLine
Next decRate

Question 49

Write a pretest loop that adds together the integers 2,4,6,8,10,12,14,16,18,and 20.Use the intNum variable to keep track of the integers.Store the result in the intResult variable (which contains the number 0).Use the For...Next statement.

Question 50

Your supervisor wants you to change the Do...Loop in the previous problem to a For...Next loop.He also wants the message to display only three times.Which of the following For clauses should you use?

A)For intCounter As Integer = 1 To 4
B)For intCounter As Integer = 1 To 3
C)For intCounter As Integer = 0 To 3
D)For intCounter = 1 To 3

Question 51

'fill list boxes with values for men's pant sizes for
'pant waist and pant length
For intWaist As Double = 28 to 46
lstWaist.Items(intWaist.ToString("N0"))
Next intWaist
SelectedItem = "28"
For intLength As Integer = 26 to 36 Step .5
lstLength.Items.Add(dblLength.ToString("N1"))
Next dblLength
lstLength.SelectedIndex = "26"

Question 52

You changed the Do clause to the correct For clause in the previous problem.You also changed the Loop keyword to the Next keyword for the For...Next loop.What else needs to be changed about the Do loop?

A)The statement before the loop declaring the counter variable needs to be removed.
B)The statement within the loop incrementing the counter variable needs to be removed.
C)You need to add a step value to the For clause because the default step value is 0.
D)a and b

Question 53

Write a pretest loop that adds together integers from 1 to 50.Use the intNumber variable (which contains the number 1)to keep track of the integers.Store the result in the intResult variable (which contains the number 0).Use the Do...Loop statement and the While keyword.

Question 54

Explain the difference between using the keywords While and Until within a Do...Loop statement.

Question 55

Write a counter-controlled loop that adds 5,10,15,20,25,and 30 to the lstMinutes control.

Question 56

Write the assignment statements needed to increment the intCount counter by 1 and update the decBalance variable by the value stored in the decOrderAmount variable.

Question 57

What is a counter? What does it mean to initialize and update a counter in a program?

Question 58

Explain the difference between a pretest loop and a posttest loop.

Question 59

What is a counter-controlled loop and when is it used in a program? What statement provides the most efficient way to write a counter-controlled loop?

Question 60

The following code in a different program is not working properly.The message should display the value of the intCounter variable if the intCounter variable contains a balance that is less than or equal to 15.The message does not display.What mistake did the previous programmer make? intCounter = 1
Do Until intCounter <= 15
MessageBox.Show(intCounter)
IntCounter += 1
Loop

A)The counter is not initialized.
B)The While keyword should be used instead of the Until keyword.
C)The counter is not incrementing.
D)intCounter += 1 should be changed to intCounter = intCounter + 1.