chapter 7 - arraysip204-5.sth.wku.edu/cs146web/quizzes/chapter07.pdf17. what two numbers are...

Chapter 7 Arrays

Section 7.1 Creating and Using Arrays

1. After the following Dim statement is executed, how many elements will the array myVar

have?

Dim myVar(7) As Double

(A) 0

(B) 1

(C) 8

(D) 9

C

2. In the line of code

Dim scores() As Integer = {55, 33, 12}

the upper bound of the array scores is which of the following?

(A) 2

(B) 1

(C) 11

(D) 0

A

3. Each individual variable in the list

student(0), student(1), student(2)

is known as a(n)

(A) subscript.

(B) dimension.

(C) element.

(D) type.

C

4. In the statement

Dim scores(30) As Double

the number 30 designates which of the following?

(A) the highest value of the subscripts of the elements for the array scores

(B) the maximum value that can be assigned to any element in the array scores

(C) the data type for the array scores

(D) the value initially assigned to each element in the array scores

A

5. Which statement is true regarding the following Dim statement?

Dim states(49) As String, populations(49) As Double

(A) It is invalid since more than one array is dimensioned by a single Dim statement.

(B) It is invalid since the two arrays must have the same data type.

(C) The subscripts of states range from 1 to 49.

(D) The subscripts of populations range from 0 To 49.

D

6. The Count method returns what information about an array?

(A) the highest number that can be used as a subscript for the array

(B) the largest value that can be assigned to an array element

(C) the number of elements in the array

(D)tThe highest dimension of the array

C


For index As Integer = 0 to (score.Count - 1)

the Count method is used to carry out which of the following tasks?

(A) determine the largest value for each of the elements

(B) determine the largest subscript in the array

(C) determine the smallest value for each of the elements

(D) declare a new array with the name Count

B

8. The ReDim statement causes an array to lose its current contents unless the word ReDim is

followed by the keyword

(A) CInt

(B) MyBase

(C) Preserve

(D) Add

C

9. Like other variables, array variables can be declared and assigned initial values at the same

time. (T/F)

T

10. After an array has been declared, its type (but not its size) can be changed with a ReDim

statement. (T/F)

F

11. If you use the ReDim statement to make an array smaller than it was, data in the eliminated

elements can be retrieved by using the Preserve keyword. (T/F)

F

12. What will be the size of the array stones after the following two lines of code are executed?

Dim stones() As String = {"Watts", "Jagger", "Wood", "Richards"}

ReDim Preserve stones(10)

11

13. The statement

Dim newlist(10) As String

is used to declare an array where each element has the value 10. (T/F)

F


Function Sum(scores() As Integer) As Integer

the pair of parentheses that follows scores can be removed. (T/F)

F


Dim scores() As Integer = {55, 33, 12}

the upper bound of the array scores is 12. (T/F)

F

16. What two names are displayed in the list box when the button is clicked on?

Dim krispies() as String

Private Sub frmCereal_Load(...) Handles MyBase.Load

krispies(0) = "snap"

krispies(1) = "crackle"

krispies(2) = "pop"

End Sub

Private Sub btnDisplay_Click(...) Handles btnDisplay.Click

lstBox.Items.Add(krispies.Max)

lstBox.Items.Add(krispies.Last)

End Sub

(A) crackle and pop

(B) crackle and snap

(C) snap and crackle

(D) snap and pop

D

17. What two numbers are displayed in the list box when the button is clicked on?

Dim nums() as Integer

Private Sub frmNumbers_Load(...) Handles MyBase.Load

nums(0) = 5

nums(1) = 3

nums(2) = 4

End Sub


lstBox.Items.Add(nums.Average)

lstBox.Items.Add(nums.Max)

End Sub

(A) 4 and 5

(B) 4 and 4

(C) 3 and 5

(D) 3 and 4

A

18. Either a For...Next loop or a For Each loop can be used to display every other value from an

array in a list box. (T/F)

F

19. An array can contain both numeric and string values. (T/F)

F

20. A Function procedure can return a number, but cannot return an array of numbers. (T/F)

F

21. What names are displayed in the list box when the button is clicked on?


Dim names() As String = IO.File.ReadAllLines("Data.txt")

lstBox.Items.Clear()

For i As Integer = (names.Count - 1) To 0 Step -2

lstBox.Items.Add(names(i))

Next

End Sub

Assume the five lines of the file Data.txt contain the following entries: Bach, Borodin,

Brahms, Beethoven, Britain.

(A) Bach, Brahms, and Britain

(B) Britain, Beethoven, Brahms, Borodin, and Bach

(C) Bach, Borodin, Brahms, Beethoven, and Britain

(D) Britain, Brahms, and Bach

D

22. What names are displayed in the list box when the button is clicked on?


Dim file As String = "Ships.txt"

Dim ships() As String = FillArray(file)

lstBox.Items.Add(ships(2))

lstBox.Items.Add(ships.Min)

End Sub

Function FillArray(file As String) As String()

Dim names() As String = IO.File.ReadAllLines(file)

Return names

End Function

Assume the three lines of the file Ships.txt contain the following entries: Pinta, Nina, Santa

Maria.

(A) Pinta and Nina

(B) Santa Maria and Pinta

(C) Nina and Santa Maria

(D) Santa Maria and Nina

D

23. What numbers are displayed in the list box when the button is clicked on?


Dim file As String = "Beatles.txt"

Dim fabFour() As String = FillArray(file)

lstBox.Items.Add(Array.IndexOf(fabFour, "Ringo")

lstBox.Items.Add(fabFour.Count - 1)

End Sub

Function FillArray(file As String) As String()

Dim names() As String = IO.File.ReadAllLines(file)

Return names

End Function

Assume the four lines of the file Beatles.txt contain the following entries: John, Paul, Ringo,

George.

(A) 3 and 3

(B) 3 and 4

(C) 2 and 3

(D) 2 and 4

C

24. What names are displayed in the list box by the following program segment?

Dim newYork As String = "Manhatten,Bronx,Brooklyn,Queens,Staten Island"

Dim boroughs() As String = newYork.Split(","c)

lstBox.Items.Add(boroughs(0))

lstBox.Items.Add(borought.Min)

(A) Brooklyn and Queens

(B) Manhatten and Staten Island

(C) Bronx and Manhatten

(D) Manhatten and Bronx

D

25. What numbers are displayed in the list box by the following program segment?

Dim numbers As String = "1492,1776,1945"

Dim temp() As String = numbers.Split(","c)

Dim nums(2) As Integer

For i As Integer = 0 to 2

nums(i) = CInt(temp(i))

Next

lstBox.Items.Add(nums(1))

lstBox.Items.Add(nums.First)

(A) 1776 and 1492

(B) 1776 and 1776

(C) 1492 and 1492

(D) 1945 and 1492

A

26. What is the output of the following program segment?

Dim nums(8) As Integer

Dim total As Double = 0

For i As Integer = 0 To 8

nums(i) = i

Next

For k As Integer = 1 To 4

total += 10 ^ nums(k)

Next

txtBox.Text = CStr(total)

(A) 10000

(B) 11110

(C) 1110

(D) 0

B

27. What will be displayed when the following program segment is executed? Dim temp() As String = IO.File.ReadAllLines("Data.txt")

Dim n As Integer = temp.Count - 1

Dim a(n) As Double

For k As Integer = 0 To n

a(k) = CDbl(temp(i))

Next

txtBox.Text = CStr(a(3))

Assume the five rows of the file Data.txt contain the following entries: 3, 2, 5, 1, 4.

(A) 1

(B) 2

(C) 3

(D) 4

A


Dim temp() As String = IO.File.ReadAllLines("Data.txt")


Dim numbers(n) As Double, h As Double = 0

For i As Integer = 0 To n

numbers(i) = CDbl(temp(i))

Next

For k As Integer = 0 to n

h += numbers(k)

Next

txtBox.Text = CStr(h)

Assume the four rows of the file Data.txt contain the following entries: 2, 4, 2, 3

(A) 11

(B) 2

(C) 7

(D) 4

A

29. Given the Dim statement below, which set of statements will initialize all elements of

myArray to 100?

Dim myArray(100) As Double

(A) myArray = 100

(B) For i As Integer = 0 To 100 (i) = 100

Next

(C) For j As Integer = 0 to 100 myArray(j) = 100

Next

(D) myArray() is already initialized to 100 by the Dim statement.

C


Dim c As Double

Dim temp() As String = IO.File.ReadAllLines("Data1.txt")


Dim a(n) As Double


a(i) = CDbl(temp(i))

Next

temp() = IO.File.ReadAllLines("Data2.txt")

Dim b(n) As Double


b(i) = CDbl(temp(i))

Next

For k As Integer = 0 To n

If a(k) = b(k) Then

c += 1

End If

Next

lstBox.Items.Add(c)

Assume the twenty rows of the file Data1.txt contain the following entries: 3, 2, 5, 1, 7, 8, 3,

5, 6, 2, 3, 6, 1, 6, 5, 5, 7, 2, 5, 3.

Assume the twenty rows of the file Data2.txt contain the following entries: 5, 3, 3, 4, 8, 2, 3,

5, 9, 5, 3, 7, 3, 7, 6, 3, 2, 1, 3, 4.

(A) 2

(B) 3

(C) 4

(D) 5

(E) 6

B

31. What is displayed in the message box by the following code?

Dim message As String

Dim teamNames() As String = {"Packers", "Jets", "Seahawks"}

ReDim Preserve teamName(1)

message = teamNames(1)

MessageBox.Show(message)

(A) Packers

(B) Jets

(C) Seahawks

(D) 2

B

32. If the following statement appears in a program, the array scores must have been declared

using the String data type. (T/F)

scores(1) = 87

F

33. Consider the following Dim and assignment statements for myArray(). The assignment

statement will cause a "Subscript out of range" error. (T/F)

Dim myArray(50) As Double

myArray(34) = 51

F

34. Unless otherwise specified, Visual Basic assigns the value 0 to each element of a numeric

array when it is declared with a Dim statement. (T/F)

T

35. The following pair of statement is valid. (T/F)

x = CInt(InputBox("Enter number of items (must be a positive integer)"))

ReDim myArray(x - 1)

T

36. A fractional number such as 4.6 is not allowed as a subscript. (T/F)

T

37. Consider the following Visual Basic statements:

Dim nums(4) As Double

For index As Integer = 0 To 4

nums(index) = 1 + (index * 2)

Next

What values are placed in the array by the above statements? (Show each element of the

array and the value for that element.)

nums(0)=1, nums(1)=3, nums(2)=5, nums(3)=7, nums(4)=9

38. What is the output of the following program when the button is clicked on?


Dim result As Double

Dim number(4) As Double

FillArray(number)

result = SumArray(number)

txtBox.Text = CStr(result)

End Sub

Sub FillArray(ByRef anyArray() As Double)

Dim temp() As String = IO.File.ReadAllLines("Data.txt")

For i As Integer = 0 To 4

anyArray(i) = CDbl(temp(i))

Next

End Sub

Function SumArray(anyArray() As Double) As Double

Dim total As Double

total = 0

For i As Integer = 0 To 4 Step 2

total += anyArray(i)

Next

Return total

End Function

Assume the five rows of the file Data.txt contain the following entries: 1, 3, 5, 7, 9

(A) 0

(B) 25

(C) 15

(D) None of the above

C

39. Which of the tasks is the Join function used to carry out in the following statement?

Dim line As String

line = Join(strArrData, ",")

(A) Join concatenates the values of all elements of the array strArrData, and adds a comma

delimiter between successive values.

(B) Join concatenates the values of all elements of line, and adds a comma to the end of the

line.

(C) Join parses or separates out all items of text that are delimited by a comma in

strArrData.

(D) Join parses or separates out all items of text that are delimited by a comma in line.

A

Section 7.2 Using LINQ with Arrays

1. What names are displayed in the list box by the following lines of code?

Dim oceans() As String = {"Atlantic", "Pacific", "Indian", "Arctic",

"Antartic"}

Dim query = From ocean in oceans

Where ocean.Length = 6

Select ocean

For Each ocean As String In query

lstBox.Items.Add(ocean)

Next

(A) Pacific and Indian

(B) Indian and Arctic

(C) Indian

(D) Atlantic and Pacific

B


Dim numbers() As Integer = {4, 7, 9, 3, 1}

Dim query = From number in numbers

Where number > 6

Select number

lstBox.Items.Add(query.Count)

lstBox.Items.Add(query.Average)

(A) 5 and 12

(B) 2 and 12

(C) 2 and 8

(D) 5 and 8

C


Dim numbers() As Integer = {4, 7, 9, 3, 1, 9, 7}


Where number > 6

Select number



(A) 7 and 12

(B) 4 and 8

(C) 2 and 12

(D) 7 and 8

B


Dim numbers() As Integer = {4, 7, 9, 3, 1, 7, 7}


Where number > 6

Select number

Distinct



(A) 5 and 12

(B) 2 and 12

(C) 2 and 8

(D) 5 and 8

C

5. What states are displayed in the list box by the following program segment?

Dim states() As String = {"Colorado", "New Mexico", "Arizona", "Utah"}

Dim query = From state in states

Where ContainsE(state)

Select state

For Each state in query

lstBox.Items.Add(state)

Next

Function ContainsE(word As String) As Boolean

If word.IndexOf("E") <> -1 Or word.IndexOf("e") <> -1 Then

Return True

Else

Return False

End If

End Function

(A) Colorado

(B) New Mexico

(C) Colorado, New Mexico, Arizona, Utah

(D) No states

B




Where state.length < 5

Select state.ToUpper

For Each state in query

lstBox.Items.Add(state)

Next

(A) Utah

(B) COLORADO, NEW MEXICO, ARIZONA, UTAH

(C) UTAH

(D) No states

C




Where state.EndsWith("o")

Select state.Length

For Each number in query

lstBox.Items.Add(number)

Next

(A) 8 and 10

(B) 8, 10, 7, 4

(C) 8

(D) 29

A

8. What names are displayed in the list box by the following program segment?

Dim tonightShow() As String = {"Allen", "Parr", "Carson", "Leno",

"O'Brien", "Leno"}

Dim query = From host in tonightShow

Where host.Length = 4

Select host

Distinct

For Each host in query

lstBox.Items.Add(host)

Next

(A) Parr, Leno, Leno

(B) Parr, Leno

(C) Leno

(D) No names

B


Dim numbers() As Double = {.5, 1, 2, 2.5}


Where number < 2

Let FormattedPer = number.ToString("P")

Select FormattedPer

For Each percent In query

lstBox.Items.Add(percent)

Next

(A) .5 and 1

(B) 50% and 100%

(C) 50.00%, 100.00%, 200.00%, 250.00%

(D) 50.00% and 100.00%

D

10. What years are displayed in the list box by the following program segment?

Dim years() As Integer = {1492, 1776, 1840, 1929, 1945, 2005}

Dim query = From year in years

Where Is20thCentury(year)

Select year

For Each year in query

lstBox.Items.Add(year)

Next

Function Is20thCentury(num As Integer) As Boolean

If (num >= 1900) and (num < 2000) Then

Return True

Else

Return False

End IF

End Function

(A) 1929 and 1945

(B) 1929

(C) 1492, 1776, 1840, 1929, 1945, 2005

(D) No years

A




Order By state Ascending

Select state

lstBox.Items.Add(query.First)

lstBox.Items.Add(query.Min)

(A) Arizona and Colorado

(B) Arizona and Utah

(C) Colorado and Arizona

(D) Arizona and Arizona

D

12. What words are displayed in the list box by the following program segment?

Dim deadlySins() As String = {"pride", "greed", "anger", "envy",

"lust", "gluttony", "sloth"}

Dim query = From sin in deadlySins

Order By sin Ascending

Where sin.StartsWith("g")

Select sin


lstBox.Items.Add(query.Max)

(A) gluttony and greed

(B) gluttony and gluttony

(C) pride and gluttony

(D) greed and greed

A


Dim deadlySins() As String = {"pride", "greed", "anger", "envy",

"lust", "gluttony", "sloth"}

Dim query = From sin in deadlySins

Order By sin.Length Descending

Select sin.ToUpper



(A) GLUTTONY and GLUTTONY

(B) GLUTTONY and SLOTH

(C) GLUTTONY and ANGER

(D) PRIDE and ENVY

C

14. What colleges are displayed in the list box by the following program segment?

Dim ivies() As String = {"Harvard", "Princeton", "Yale", "Dartmouth",

"Brown", "Columbia", "Univ. of PA", "Cornell"}

Dim query = From college in ivies

Order By college Descending

Select college



(A) Yale and Brown

(B) Yale and Yale

(C) Brown and Brown

(D) Harvard and Brown

A





Where college.Length <= 9

Order By college.Length Descending, college Descending

Select college

lstBox.Items.Add(query.Last)


(A) Dartmouth and Princeton

(B) Yale and Brown

(C) Yale and Cornell

(D) Dartmouth and Yale

B





Where college.Length <= 9

Order By college.Length Descending, college Ascending

Select college


lstBox.Items.Add(query.Max)

(A) Dartmouth and Princeton

(B) Yale and Brown

(C) Yale and Cornell

(D) Dartmouth and Yale

D


Dim dimensions() As String = {"width", "height", "depth"}

Dim query = From dimension in dimensions

Order By dimension.Length Descending, dimension Ascending

Select dimension

lstBox.DataSource = query.ToList

lstBox.SelectedIndex = Nothing

(A) width, height, depth

(B) height, depth, width

(C) height, width, depth

(D) depth, width, height

B


Dim numbers() As Integer = {5, 79, 8, 33, 27}


Let formattedNum = number.ToString("N0")

Order By formattedNum Ascending

Select formattedNum



(A) 5, 8, 27, 33, 79

(B) 79, 33, 27, 8, 5

(C) 27, 33, 5, 79, 8

(D) 5, 79, 8, 33, 27

C

19. In an ascending ordered array, the value of each element is

(A) less than or equal to the value of the next element.

(B) greater than or equal to the value of the next element.

(C) equal to the value of the next element.

(D) greater than the value of the next element.

A

20. Which of the following is NOT an example of an ordered array?

(A) years

1877 1944 2011 4301

(B) cities

Selah Wapato Yakima Zillah

(C) nbrhoods

Hockinson Brush Prairie Dollars Corner Battle Ground

(D) nums

457 457 457 458

C

21. Which of the following is an ordered descending array?

(A) years

1011 1112 1112 1377

(B) cities

Selah Wapato Yakima Zillah

(C) nbrhoods

Parkrose Hockinson Dollars Corner Battle Ground

(D) nums

459 457 457 458

C

22. Arrays are said to be ordered only if the values are in ascending order. (T/F)

F

23. Searching successive elements of an ordered list beginning with the first element is known

as a binary search. (T/F)

F

Section 7.3 Some Additional Types of Arrays

1. Consider the following structure definition. Which Dim statement would correctly declare

an array of this structure for elements having subscripts from 0 through 30?

Structure carType

Dim yr As Integer

Dim make As String

Dim model As String

End Structure

(A) You cannot have an array of structures.

(B) Dim carType(30)

(C) Dim car(30) As carType

(D) Dim carType(30) As car

C

2. Consider the following Structure definition and declaration. Which assignment statement

would correctly record that player number 13 had three home runs so far this season?

Structure playerType

Dim fullname As String

Dim team As String

Dim position As String

Dim homerun As Double

Dim average As Double

Dim rbi As Double

End Structure

Dim player(45) As playerType

(A) player(13) = 3

(B) player(13).homerun(3)

(C) playerType(13).homerun = 3

(D) player(13).homerun = 3

(E) None of the above

D

3. Suppose a structure is created with the code

Structure stateUSA

Dim capCity As String

Dim stateNum As Integer

End Structure

in the Declarations section of the Code Editor. Which of the following statements correctly

declares a variable of type stateUSA?

(A) Dim stateUSA As stateWA

(B) Dim stateWA As Structure

(C) Dim stateWA As stateUSA

(D) Dim stateWA As Member

C


Structure stateUSA



End Structure

in the Declarations section of the Code window. The code

Dim stateWA As stateUSA

Dim message As String

stateWA.stateNum = 42

stateWA.capCity = "Olympia"

message = stateWA.capCity & " " & stateWA.stateNum

MessageBox.Show(message)

is placed in the Click event procedure for one of the program’s buttons. What output will be

displayed in the message box when the button is clicked on?

(A) 42 Olympia

(B) Olympia42

(C) 42Olympia

(D) Olympia 42

D

5. The members of a structure must all be of the same data type. (T/F)

F


Structure stateUSA


Dim yearFounded As Integer

End Structure

in the Declarations section of the Code window. In this structure, the variable capCity is

known as a member. (T/F)

T


Structure stateUSA



End Structure

in the Declarations section of the Code window. The following statement correctly makes

use of the stateNum member of this structure. (T/F)

Dim stateWA As stateUSA

StateWA.stateNum = 42

T

8. A structure can contain members that are simple variables only; members cannot be arrays.

(T/F)

F

9. When a variable with a user-defined data type is passed to a procedure, the corresponding

parameter in the Sub or Function statement must be declared to be of the same data type.

(T/F)

T

10. Suppose a structure and an array are created with the code

Structure Nation

Dim name As String

Dim continent As String

Dim population As Double 'in millions

Dim area As Double 'in square miles

End Structure

Dim nations(191) As Nation

in the Declarations section of the Code editor and the array is filled with data for the 192

member nations of the UN. What will be displayed in the list box when the following code

is executed?

Dim query = From country In nations

Where country.continent = "Africa"

Order By country.population Descending

Select country.name



(A) the names of the countries in Africa in alphabetical order

(B) the names of the countries in Africa beginning with the name of the least populous

country

(C) the names of the countries in Africa beginning with the name of the most populous

country

(D) the names of the countries in Africa in reverse alphabetical order

C


Structure Nation

Dim name As String




End Structure



member nations of the UN. What will be displayed in the list box when the following code

is executed?


Order By country.area Descending

Select country.name, country.population

lstBox.Items.Add(query.First.name)

lstBox.Items.Add(1000000 * query.First.population)

(A) the name and population of the smallest country in the UN

(B) the name and population of the largest country in the UN

(C) the name and population of the least populous country in the UN

(D) the name and population of the most populous country in the UN

B


Structure Nation

Dim name As String




End Structure



member nations of the UN. What will be displayed in the DataGridView control when the

following code is executed?


Where country.population > 200

Order By country.area Descending

Select country.name, country.continent

dgvNations.DataSource = query.ToList

dgvNations.CurrentCell = Nothing

(A) Two columns, with headers name and continent. The grid will display the countries

(along with their continents) whose populations are greater than 200 million people.

The countries will be displayed in order to their population, beginning with the most

populous country.

(B) Four columns, with each row containing data about a single country whose population

is greater than 200 million people. The countries will be displayed in order of their area,

beginning with the largest country.

(C) Two columns, with headers country.name and country.continent. The grid will display

the countries (along with their continents) whose populations are greater than 200

million people. The countries will be displayed in order to their area, beginning with the

largest country.

(D) Two columns, with headers name and continent. The grid will display the countries

(along with their continents) whose populations are greater than 200 million people.

The countries will be displayed in order to their area, beginning with the largest

country.

D


Structure Nation

Dim name As String




End Structure



member nations of the UN. What will be displayed in the DataGridView control when the

following code is executed?


Where (country.continent = "Europe") And

country.name.StartsWith("S")

Let countryUC = country.name.ToUpper

Let pop = (1000000 * country.population).ToString("N0")

Let area = (country.area).ToString("N0")

Order By countryUC Ascending

Select countryUC, pop, area

(A) Three columns, with headers country, population, and area. The grid will display the

countries in Europe (along with their populations and areas) whose names begin with

the letter S. The countries will be displayed capitalized in alphabetical order and their

populations and areas will be formatted with commas as thousands separators.

(B) Four columns, with headers countryUC, continent, pop, and area. The grid will display

the countries in Europe (along with their continents, populations and areas) whose

names begin with the letter S. The countries will be displayed capitalized in alphabetical

order and their populations and areas will be formatted with commas as thousands

separators.

(C) Three columns, with headers countryUC, pop, and area. The grid will display the


the letter S. The countries will be displayed capitalized in alphabetical order and their

populations and areas will be formatted with commas as thousands separators.

(D) Three columns, with headers countryUC, pop, and area. The grid will display the


the letter S. The countries will be displayed capitalized in reverse alphabetical order and

their populations and areas will be formatted with commas as thousands separators.

C

14. Which of the following methods is used to change the words in a column header of a

DataGridView control?

(A) HeaderText

(B) HeaderName

(C) HeaderContent

(D) HeaderCaption

A

Section 7.4 Two-Dimensional Arrays

1. Given the following array, what value will be assigned to num?

myArray num = myArray(3,4) 0 1 2 3 4

0 0 1 2 3 4

1 5 6 7 8 9

2 10 11 12 13 14

3 15 16 17 18 19

4 20 21 22 23 24

(A) 19

(B) 4

(C) 24

(D) 0


A

2. Assume the array nums has been filled as shown. What is the output of the following

program segment?

nums 0 1 2 3

s = 0 |------------------------

For k As Integer = 0 To 2 0 | 2 3 4 5

s += nums(k, k + 1) |

Next 1 | 6 5 4 3

lstBox.Items.Add(s) |

2 | 2 3 4 5

|

3 | 6 5 4 3

(A) 64

(B) 12

(C) 13

(D) 25


B

3. How many elements are in the array declared by

Dim myArray(3, 2) As Double

(A) 12

(B) 8

(C) 6

(D) 2


A

4. Which of the following types of variables is capable of holding the information contained in

a table that has four rows and four columns?

(A) one-dimensional arrays

(B) simple variables

(C) single-subscripted variables

(D) double-subscripted variables

D

5. Which of the following types of variables can only hold a single item of data?

(A) two-dimensional arrays

(B) simple variables

(C) single-subscripted variables

(D) double-subscripted variables

B

6. Which of the following declarations creates a two-dimensional array?

(A) Dim newVar(2, 2) As Double

(B) Dim newVar As Integer

(C) Dim newVar(2) As Double

(D) Dim newVar(2)

A

7. Which of the following declarations can be used to create a three-dimensional array?

(A) Dim newVar(3, 3) As Double

(B) Dim newVar(2, 2, 2) As Double

(C) Dim newVar(3) As Double

(D) Dim newVar(3)

B

8. Arrays that are capable of holding the contents of a table with several rows and columns, are

known as two-dimensional arrays or double subscripted variables. (T/F)

T

9. The statement

Dim nextVar(3, 5) As Double

declares a two-dimensional array that can store a table containing 4 columns and 6 rows of

numeric data. (T/F)

F

10. A two-dimensional array can be declared and initialized at the same time. (T/F)

T

11. If the two-dimensional array nums has three rows and six columns, then the value of

nums.GetUpperBound(0) is 3 and the value of nums.GetUpperBound(1) is 6. (T/F)

F

12. In the two-dimensional array declaration

Dim newVar(,) As Double = {{1, 2, 3}, {4, 5, 2054}, {6, 802, 2786}}

the comma in newVar(,) can be removed. (T/F)

F

13. The ReDim and Preserve keywords can be used with two-dimensional arrays. (T/F)

T

14. Variable arrays can only be one- or two-dimensional. (T/F)

F

15. ReDim statements cannot be used to change a one-dimensional array into a two-dimensional

array. (T/F)

T

16. ReDim statements can be used to change a one-dimensional array into a three-dimensional

array. (T/F)

F

17. Given the following statements, the first subscript in the second statement references a

column. (T/F)

Dim myArray(15, 20) As Double

myArray(5, 10) = 0

F

18. Two-dimensional arrays are often referred to as tables or matrices. (T/F)

T

19. The third statement below is NOT valid. (T/F)

row = 5

col = 3

someArray(col, row) = 25

F

20. Write code using a For...Next loop to fill a 5-by-5 matrix so that the two diagonals have

asterisks (*) in them as shown.

0 1 2 3 4

0 * *

1 * *

2 *

3 * *

4 * *

Ans: For i As Integer = 0 to 4 matrix(i, i) = "*"

matrix(i, 4 - i) = "*"

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