Deck 9: Arrays

Question 1

A two-dimensional array resembles a table in that the variables (elements) are in rows and columns.

Answer 1

True

Question 2

When a run time error occurs, the computer displays an error message and the application ends abruptly.

Answer 2

True

Question 3

An array called state() is loaded as follows: Dim state() As String = {"Ohio", "Michigan", "California", "Arizona"}
What is the value of the subscript used to reference "Arizona"?

A) 1
B) 2
C) 3
D) 4

Answer 3

C

Question 4

When an array is sorted in descending order, the first element in the array contains the smallest value and the last element contains the largest value.

Question 5

If the array's data type is Integer, each element in the array is initialized using the keyword Nothing .

Question 6

A(n) ____ is a group of variables that have the same name and data type, and are related in some way.

A) subscript
B) string
C) array
D) run time error

Question 7

The following statement will declare an array. What is the index value for the first element? Dim lakes(5)

A) 0
B) 1
C) 4
D) 5

Question 8

An advantage of using the For Each…Next statement to process an array is that your code does not need to keep track of the array subscripts or even know the number of array elements.

Question 9

The data used to initialize the elements of an array is enclosed in ____.

A) [ ]
B) { }
C) ( )
D) " "

Question 10

Assigning initial values to an array is often referred to as ____.

A) sorting the array
B) populating the array
C) assigning the array
D) declaring the array

Question 11

Which of the following correctly shows the syntax for storing data in a one-dimensional array?

A) arrayname = value
B) arrayname(subscript) = value
C) arrayname = {value}
D) arrayname(subscript) = {value}

Question 12

An array is defined as follows: Dim numbers(3) As Integer
How many elements does the array have?

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

Question 13

Before you can use an array, you first must declare it.

Question 14

If a one-dimensional array contains five elements, its Length property contains the number 5 but its highest subscript is 3.

Question 15

A simple variable is unrelated to any other variable in memory.

Question 16

The statement ____ assigns the string "Madrid" to the first element in the strCities array.

A) strCities(0) = Madrid
B) strCities(0) = "Madrid"
C) strCities(1) = Madrid
D) strCities(0) = {Madrid}

Question 17

The following statement will declare an array that has ____ elements. Dim lakes(5) As Integer

A) four
B) five
C) six
D) seven

Question 18

Storing data in an array decreases the efficiency of your code.

Question 19

If a one-dimensional array contains five elements, its highest subscript is ____.

A) 4
B) 5
C) 6
D) 7

Question 20

The data in a two-dimensional array are not required to have the same data type.

Question 21

Based on the code below, intScores(2, 0) is initialized to ____. Dim intScores(,) As Integer = {{75, 90}, {9, 25}, {23, 56}, {6, 12}}

A) 25
B) 23
C) 56
D) 75

Question 22

Case-Based Critical Thinking Questions Case 1 - Tony's Pizza & Pasta
The restaurant uses an application to update and display menu items and the related price information.
The intSub variable keeps track of array subscripts and is initialized to 0. The intHighSub variable contains the highest subscript for the strToppings array. Which of the following statements will traverse the strToppings array?

A) Do While intSub >= intHighSub
B) For intHighSub As Integer = 0 To intSub
C) Do While intSub
D) For intSub As Integer = 1 To intHighSub

Question 23

Based on the code below, intScores(1, 1) is initialized to ____. Dim intScores(,) As Integer = {{75, 90}, {9, 25}, {23, 56}, {6, 12}}

A) 9
B) 25
C) 75
D) 90

Question 24

Based on the code below, intScores(3, 1) is initialized to ____. Dim intScores(,) As Integer = {{75, 90}, {9, 25}, {23, 56}, {6, 12}}

A) 6
B) 12
C) 23
D) 56

Question 25

Consider the following array: Dim numbers(,) As Integer = {{1,2},{3,4},{4,5},{6,7},{8,9}}
What value will the following expression yield for total ?
Total = numbers(1,1) + numbers(2,0)

A) 4
B) 6
C) 8
D) 12

Question 26

Based on the code below, intScores(3, 0) is initialized to ____. Dim intScores(,) As Integer = {{75, 90}, {9, 25}, {23, 56}, {6, 12}}

A) 6
B) 12
C) 23
D) 56

Question 27

To arrange the elements in an array in ascending order, you use the ____ method.

A) Array.Arrange
B) Array.Ascending
C) Array.Sort
D) Array.Arrange

Question 28

An array's ____ method returns an integer that indicates the highest subscript in the specified dimension in the array.

A) Sort
B) Reverse
C) TryParse
D) GetUpperBound

Question 29

Using an invalid subscript will result in a ____.

A) run time error
B) breakpoint
C) logic error
D) design-time error

Question 30

The statement ____ assigns the string "Paris" to the element located in the first row, second column in the strCities array.

A) strCities(1, 1) = {Paris}
B) strCities(0, 1) = "Paris"
C) strCities(0, 0) = (Paris)
D) strCities(1, 0) = "Paris"

Question 31

Consider the following array: Dim numbers(,) As Integer = {{1,2},{3,4},{4,5},{6,7},{8,9}}
What row index value would be required to create this two-dimensional array?

A) 2
B) 3
C) 4
D) 5

Question 32

Case-Based Critical Thinking Questions Case 1 - Tony's Pizza & Pasta
The restaurant uses an application to update and display menu items and the related price information.
Which of the following statements declares a class-level one-dimensional array named strToppings that stores the 14 available pizza toppings?

A) Dim strToppings(13) As String
B) Private strToppings(13) As String
C) Dim strToppings(14) As String
D) Private strToppings(14) As String

Question 33

Based on the code below, intScores(2, 1) is initialized to ____. Dim intScores(,) As Integer = {{75, 90}, {9, 25}, {23, 56}, {6, 12}}

A) 25
B) 23
C) 56
D) 75

Question 34

You do not need to specify the highest array subscript in the ____ statement.

A) Do...Loop
B) For...Next
C) For Each...Next
D) While...Wend

Question 35

The strRoom and strRate arrays are parallel arrays. If Deluxe is stored in the third element in the strRoom array, where is its rate (115) stored?

A) strRate(0)
B) strRate(1)
C) strRate(2)
D) strRate(3)

Question 36

The syntax ____ assigns either the value entered in the txtSales control (converted to Decimal) or the number 0 to the third element in the decSales array.

A) Decimal.TryParse(txtSales.Text, decSales(3))
B) Decimal.TryParse(txtSales.Text, decSales(0))
C) Decimal.TryParse(txtSales.Text, decSales(2))
D) TryParse(txtSales.Text, decSales(1))

Question 37

Two or more arrays whose elements are related by their positions in the arrays are referred to as ____ arrays.

A) parallel
B) two-dimensional
C) accumulator
D) related

Question 38

Based on the code below, intScores(0, 0) is initialized to ____. Dim intScores(,) As Integer = {{75, 90}, {9, 25}, {23, 56}, {6, 12}}

A) 9
B) 25
C) 75
D) 90

Question 39

To refer to the element located in the first row, first column in a two-dimensional array named strProducts , you use ____.

A) strProducts(0, 0)
B) strProducts{0, 1}
C) strProducts(1, 1)
D) strProducts[0, 0]

Question 40

Based on the statement below, which of the following If clauses determines whether the intSub variable contains a valid subscript for the array? Dim strColors() As String = {"red", "green", "blue"}

A) If intSub > 0 AndAlso intSub
B) If intSub >= 0 AndAlso intSub =
C) If intSub > 0 AndAlso intSub
D) If intSub >= 0 AndAlso intSub =

Question 41

Describe two advantages to using arrays to store data.

Question 42

Case-Based Critical Thinking Questions Case 1 - Tony's Pizza & Pasta
The restaurant uses an application to update and display menu items and the related price information.
Daily "Chef's Specials" are stored using two one-dimensional parallel arrays. The days of the week are stored in the strDays array, with Sunday as the first element. The daily special for each day is stored in a parallel array named strSpecial . Which of the following statements assigns Friday's special, which is rigatoni, to the appropriate element?

A) strSpecial(6) = rigatoni
B) strSpecial(5) = rigatoni
C) strSpecial(6) = "rigatoni"
D) strSpecial(5) = "rigatoni"

Question 43

Write the statement to declare a six-element class-level array named strAnimal , and initialize the array with the following values: dog, cat, mouse, bird, snake, fish.

Question 44

Write the statements to traverse the strCategory array and display each element's value in the lstCategory control. Use a For Each...Next statement.

Question 45

Explain the difference between a simple variable and an array.

Question 46

How do the elements in parallel one-dimensional arrays relate to each other? Provide an example.

Question 47

Write the statement that assigns the string "Treasurer" to the element located in the third row, second column in the strOfficers array.

Question 48

Write the statement to declare a procedure-level two-dimensional array named dblRates using the following table of data:

Question 49

Write the statement to declare a five-element procedure-level array named decGPA , and initialize the array with the following values: 2.58, 3.85, 3.6, 1.45, 2.75. Then write a statement to assign the number 2.55 to the last element in the array.

Question 50

Case-Based Critical Thinking Questions Case 1 - Tony's Pizza & Pasta
The restaurant uses an application to update and display menu items and the related price information.
Which of the following statements assigns the daily special of lasagna to Tuesday?

A) strDailySpecial(3, 2) = lasagna
B) strDailySpecial(3, 2) = "Tuesday"
C) strDailySpecial(2, 1) = "lasagna"
D) strDailySpecial(3, 2) = "lasagna"

Question 51

Case-Based Critical Thinking Questions Case 1 - Tony's Pizza & Pasta
The restaurant uses an application to update and display menu items and the related price information.
You have decided the Daily "Chef's Specials" need to be stored in a two-dimensional array rather than two parallel one-dimensional arrays. Which of the following statements will declare the array as a procedure-level array named strDailySpecial ? The number of rows is based on the number of days in the week, and Sunday remains the first element for the days of the week.

A) Dim strDailySpecial(6, 1) As String
B) Dim strDailySpecial(7, 2) As String
C) Dim strDailySpecial(1, 6) As String
D) Dim strDailySpecial(2, 7) As String

Question 52

The following array is declared and initialized:
Dim dblMilesPerTrip() As Double = {542, 28, 79.5, 322.6, 114}
Write the statements to total the values in the array.

Question 53

Write the statement to declare a four-element procedure-level array named intNum with each element initialized to 0. Then write the statements necessary to add the number 5 to each element in the intNum array.

Question 54

Problems - Correcting Logic and Code Errors
The following sample of code contains errors. Rewrite the incorrect statements to correct all errors.
Private Sub btnGetHighest_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnGetHighest.Click
' displays the highest prize amount and the
' number of people who won that amount
Dim intPrizes(10) As Integer = {50, 25, 100, 25, 100,
25, 75, 50, 40, 60}
Dim intHighSub As Integer = intPrizes.GetHighest()
Dim intHighPrize As Integer = intPrizes(0)
Dim intWinners As Integer = 1
For intX As Integer = 1 To intHighSub
If intPrizes(intX) = intHighPrize Then
intWinners *= 1
Else
If intPrizes(intX)
intHighPrize = intPrizes(intX)
intWinners = 1
End If
End If
Next intX
lblHighest.Text = intHighPrize.ToString("C0")
lblWinners.Text = intWinners.ToString
End Sub

Question 55

Write the statement to declare a seven-element procedure-level array named strItemCode with each element initialized to the keyword Nothing .

Question 56

The following array is declared and initialized:
Dim dblMilesPerTrip() As Double = {542, 28, 79.5, 322.6, 114}
Write the statements to sort the values in the array in descending order.

Question 57

Problems - Correcting Logic and Code Errors
The following sample of code contains errors. Rewrite the incorrect statements to correct all errors.
Private Sub btnDisplay_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDisplay.Click
' displays the pay rate associated with a pay code
Dim strCodes() As String = {PT1, PT2, FT1, FT2, FT3}
Dim dblRates() As Integer = {10.5, 12, 13.5, 14}
Dim strSearchForCode As String
Dim intSub As Integer
' assign the code to a variable
txtCode.Text = strSearchForCode
' search the strCodes array for the pay code
' continue searching until the end of the array
' or the pay code is found
Do Until intSub > strCodes.Length OrElse
strSearchForCode = strCodes(intSub)
intSub = intSub + 1
Loop
' determine whether the pay code was found
If intSub
lblRate.Text = dblRates(1).ToString("C0")
Else
MessageBox.Show("Invalid Pay Code",
"Employee Pay Application",
MessageBoxButtons.OK,
MessageBoxIcon.Information)
End If
txtCode.Focus()
End Sub

Question 58

Write the statement to declare a twelve-row, two-column procedure-level array named strLocations , initializing each element to the keyword Nothing .

Question 59

Write the statement that assigns the length of the strBooks array to the intNumElements variable. Then write the statement that assigns the highest subscript in the array to the intHighestSub variable.

Question 60

Write the statements to traverse the strCategory array and display each element's value in the lstCategory control. Use a Do...Loop statement.