Question 1

In the line of code 
Function Sum(scores As Integer) As Integer 
the pair of parentheses that follows scores can be removed.

Accepted Answer

The parentheses around "scores As Integer" are necessary for declaring the parameter in the function signature in many programming languages, including Visual Basic. Removing them would result in a syntax error.

Question 2

The statement 
Dim newlist(10) As String 
is used to declare an array where each element has the value 10.

Accepted Answer

The statement declares an array of 11 elements (indexed from 0 to 10) where each element is a string datatype. The value 10 does not have any relation to the array elements.

Question 3

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.

Accepted Answer

Using the Preserve keyword with ReDim only allows you to keep the data in the existing elements when resizing an array; it does not enable you to retrieve data from elements that have been eliminated by making the array smaller.

Question 4

The ReDim statement causes an array to lose its current contents unless the word ReDim is followed by the keyword

Accepted Answer

The Preserve keyword should follow the ReDim statement in order to retain the current contents of the array. Without it, the contents will be lost.

Question 5

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

Accepted Answer

The ReDim statement is used in some programming languages like Visual Basic to resize an array, but it cannot change the type of an already declared array.

Question 6

After the following Dim statement is executed, how many elements will the array myVar have? 
Dim myVar(7) As Double

Accepted Answer

The statement creates an array named "myVar" with 8 elements, indexed from 0 to 7, and each element is a Double data type. Therefore, the answer is C - 8 elements.

Question 7

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

Accepted Answer

The code attempts to assign values to an undeclared array, which would cause a runtime error. However, if it were corrected to be a proper array declaration, the `.Max` method would return "snap" as the maximum value in alphabetical order, and `.Last` would return "pop" as the last element in the array.

Question 8

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.

Accepted Answer

The answer of Either a For...Next loop or a For...

Question 9

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 
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click 
lstBox.Items.Add(nums.Average) 
lstBox.Items.Add(nums.Max) 
End Sub

Accepted Answer

The code calculates the average and maximum of the numbers in the `nums` array, which are 4 (average of 5, 3, 4) and 5 (maximum number in the array), respectively.

Question 10

Which statement is true regarding the following Dim statement? 
Dim states(49) As String, populations(49) As Double

Accepted Answer

In many programming languages, including Visual Basic, array indices start at 0 by default. Therefore, an array declared with a size of 49 (as in `states(49)` or `populations(49)`) will have indices ranging from 0 to 49, making option D correct. Options A and B are incorrect because it is perfectly valid to declare multiple arrays in a single Dim statement, and they do not need to have the same data type. Option C is incorrect because, as mentioned, the default starting index is 0, not 1, making the range 0 to 49, not 1 to 49.

Question 11

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

Accepted Answer

Array variables can be declared and assigned initial values at the same time using the syntax: data_type array_name[] = {value1, value2, value3, ...};

Question 12

A Function procedure can return a number, but cannot return an array of numbers.

Accepted Answer

A function procedure can return an array of numbers by specifying the data type of the returned value as an array.

Question 13

In the line of code 
For index As Integer = 0 to (score.Count - 1) 
the Count method is used to carry out which of the following tasks?

Accepted Answer

The Count method returns the number of elements in the array, so in this line of code, it is being used to determine the largest subscript in the array. This is because the loop is iterating through each index from 0 to (score.Count - 1), which is the total number of elements in the array minus 1 (since indexing starts at 0).

Question 14

In the statement 
Dim scores(30) As Double 
the number 30 designates which of the following?

Accepted Answer

The number 30 designates the highest value of the subscripts of the elements for the array scores. This means that the array scores can hold up to 31 elements, numbered from 0 to 30.

Question 15

The Count method returns what information about an array?

Accepted Answer

The Count method returns the number of elements in the array.

Question 16

In the line of code 
Dim scores As Integer = {55, 33, 12} 
the upper bound of the array scores is 12.

Accepted Answer

The upper bound of the array scores is actually 2 because there are 3 elements in the array and the index starts at 0. Therefore, the index values go from 0 to 2, not 0 to 12.

Question 17

An array can contain both numeric and string values.

Accepted Answer

The answer of An array can contain both numeric and...

Question 18

What names are displayed in the list box when the button is clicked on? 
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click 
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.

Accepted Answer

The loop iterates from the last line to the first line, adding every second name to the list box. Thus, it adds Britain, Brahms, and Bach.

Question 19

Each individual variable in the list 
student(0), student(1), student(2) 
is known as a(n)

Accepted Answer

Each individual variable in the list student(0), student(1), student(2) is known as an element. A subscript is the index or position within an array or list, a dimension refers to the size of the array or list, and a type refers to the data type of the variables.

Question 20

In the line of code 
Dim scores As Integer = {55, 33, 12} 
the upper bound of the array scores is which of the following?

Accepted Answer

The upper bound of an array is always one less than the length of the array. In this case, the length of the array is 3, so the upper bound is 2 (the index of the last element in the array). Therefore, the correct answer is A, 2.

Quiz 7: Arrays

In the line of code Function Sum(scores As Integer) As Integer the pair of parentheses that follows scores can be removed.

The statement Dim newlist(10) As String is used to declare an array where each element has the value 10.

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.

The ReDim statement causes an array to lose its current contents unless the word ReDim is followed by the keyword

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

After the following Dim statement is executed, how many elements will the array myVar have? Dim myVar(7) As Double

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.

Which statement is true regarding the following Dim statement? Dim states(49) As String, populations(49) As Double

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

A Function procedure can return a number, but cannot return an array of numbers.

In the line of code For index As Integer = 0 to (score.Count - 1) the Count method is used to carry out which of the following tasks?

In the statement Dim scores(30) As Double the number 30 designates which of the following?

The Count method returns what information about an array?

In the line of code Dim scores As Integer = {55, 33, 12} the upper bound of the array scores is 12.

An array can contain both numeric and string values.

Each individual variable in the list student(0) , student(1) , student(2) is known as a(n)

In the line of code Dim scores As Integer = {55, 33, 12} the upper bound of the array scores is which of the following?