Deck 7: Arrays

Question 1

An array must be declared and allocated in the same statement.

Answer 1

False

Question 2

Arrays consist of items of different types.

Answer 2

False

Question 3

The braces { and } delimit an:

A)indexing list
B)allocator list
C)initializer list
D)array list

Answer 3

C

Question 4

An array reference may be assigned only to a different array of the same size as the array it's currently referencing.

Question 5

To declare an array one must provide the:

A)array name and array size
B)array name and data type
C)array size and data type
D)array name,array size and data type

Question 6

Which of the following statements about arrays are true?
I)Arrays are groups of variables that all have the same type.
II)Elements are located by index
III)The length of an array c is determined by the expression c.Length.
IV)The zeroth element of array c is specified by c(0).

A)I,III,and IV.
B)I,II,and IV.
C)both III and IV.
D)I,II,III,and IV.

Question 7

The amount of memory required by an array depends on the:

A)length of the array
B)size of the data type of the elements in the array
C)both a and b
D)None of the above

Question 8

The position number in square brackets is formally called an index.

Question 9

Consider the array: s( 0 )= 7

The value of s( s( 6 )- s( 5 ))is:

A)0.
B)3
C)9
D)0

Question 10

The first element in every array is the 0th element.

Question 11

The number in parentheses after an array name is the of the item in the array.

A)value
B)position
C)size
D)None of the above.

Question 12

Arrays normally are data structures.

A)constant
B)dynamic
C)static
D)None of the above.

Question 13

Only literal integer values can be used as an index into an array.

Question 14

All arrays have access to the methods and properties of this class:

A)VisualBasic.Array
B)Microsoft.Array
C)System.Array
D)None of the Above

Question 15

You must do the following before using an array:

A)declare then reference the array
B)initialize then declare the array
C)initialize then reference the array
D)declare then initialize the array

Question 16

Arrays may have dimensions.

A)one
B)two
C)any number of
D)a or b

Question 17

Which of the following correctly accesses element 13 of array Book?

A)Book(0)+ 13
B)Book(13)
C)Book[13]
D)None of the above.

Question 18

The value used to indicate a specific location within an array is called the index or subscript.

Question 19

Consider the code segment below.Which of the following statements is false?

A)The first statement declares an array reference.
B)The second statement creates the array.
C)array is a reference to an array of integers.
D)The value of array( 3 )is -1.

Question 20

The number of elements in the array must be specified in parentheses after the array name in the declaration.

Question 21

If an attempt is made to use an invalid index to access an element,a(an)__________exception occurs.

A)InvalidIndexException
B)RangeException
C)IndexOutOfRangeException
D)None of the above.

Question 22

Consider the code below:
The value of variable result will be:

A)280
B)154
C)286
D)332

Question 23

Values in an array can be totaled by using the ArrayTotal method.

Question 24

Arrays can be used as sets of counters.

Question 25

Invalid possibilities for array indices include .

A)positive integers
B)negative integers
C)zero

Question 26

Often,the elements of an array represent a series of related values that are used in a calculation.

Question 27

A ComboBox combines features of a TextBox and a __________.

A)Button
B)Itembox
C)ListBox
D)SliderBox

Question 28

In an array of reference types,each element may be a reference to a different type.

Question 29

In an array of Boolean variables,if the initializer list is empty,the elements in the array are initialized to the default value True.

Question 30

When an expression contains nested parentheses,its evaluation begins with the value in the outermost set of parentheses.

Question 31

Visual Basic can determine the array bounds from the number of elements in the initializer list.

Question 32

Arrays can hold only data of primitive types.

Question 33

The expression array.GetUpperBound(1)can be used to determine the upper bound of a one-dimensional array.

Question 34

The declaration and allocation of an array can be combined into one statement.

Question 35

Array method GetUpperBound returns the index of the last element in an array.The value returned by method GetUpperBound is one less than the value of the array's Length property.

Question 36

Each reference in an array of references is pointed to Nothing by default when the array is allocated.

Question 37

When a program is executed,array element indices are checked for validity-all indices must be greater than or equal to 0 and less than or equal to the length of the array.

Question 38

Referencing an element outside the array bounds is a:

A)syntax error
B)compile error
C)runtime error
D)None of the above

Question 39

Consider the code below:
The value of variable result will be:

A)62
B)64
C)65
D)67

Question 40

Which of the following will not produce a compiler error?

A)Changing the value of a constant after it's declared.
B)Changing the value at a given index of an array after it's created.
C)Using a constant variable before it's initialized.
D)All of the above will produce compiler errors.

Question 41

When passing an array to a procedure,the method's parameter list must
specify that an array will be received.

Question 42

The For Each…Next repetition statement is appropriate when the program doesn't need to refer to the indices of the elements in an array.

Question 43

String method Replace receives two arguments-the substring that should be replaced throughout the original String and the replacement substring.

Question 44

Which of the following is not a way of sorting data?

A)ascending
B)descending
C)random
D)None of the above

Question 45

For Each…Next loop is barely used because it's more complicated than the For…Next loop.

Question 46

Which method call does the method head Sub ModifyArray(ByVal a As Double())represent? Assume that the array being passed (list)is already defined.

A)ModifyArray( double()list )
B)ModifyArray( double(): list )
C)ModifyArray( double list())
D)ModifyArray( list )

Question 47

ComboBox property ItemSource specifies the source of the items displayed in the ComboBox.

Question 48

The For Each…Next repetition statement requires you to provide an array,its type and a variable for the purpose of:

A)preventing the statement from going past the end of the array
B)storing the value of each typed element that's traversed
C)acting as a counter to traverse the array
D)None of the above.

Question 49

When using the Sort method from the Array class,the method will sort the passed in array in descending order.

Question 50

Array element values of primitive data types,such as Integer,can be passed to a method by:

A)value
B)reference
C)both a and b
D)None of the above

Question 51

An individual element of an integer array is passed to a method by value.

Question 52

Class Array provides methods for _________ arrays.

A)creating
B)modifying
C)sorting
D)searching
E)All of the above

Question 53

Changes made to an entire array that has been passed to a method will not affect the original values of the array.

Question 54

ComboBox property __________specifies the maximum number of items to display at one time.

A)MaxDropDownItems
B)MaxItems
C)MaxDisplayItems
D)None of the above

Question 55

When we pass an array object to a procedure,we do not need to pass the upper
bound of the array as a separate argument.

Question 56

What is the proper For Each…Next header format?

A)For Each Type in arrayName
B)For Each arrayName
C)For Each type_identifer As Type In arrayName
D)None of the above.

Question 57

If you want to pass an array element into a method by reference,what will you need to do?

A)It always passes the element as a reference automatically.
B)Use the keyword ByRef
C)Each of the above.
D)None of the above,passing in by reference of an array element is only possible if the array type is a reference type.

Question 58

To pass an array argument to a method,specify the name of the array followed by empty parentheses.

Question 59

An array itself can be passed to a method by:

A)value
B)reference
C)both a and b
D)None of the above

Question 60

Class Array's method SortDesc will sort an array in descending order.

Question 61

The optional ________ keyword in the ReDim statement will keep the existing array elements after the array is resized.

A)Keep
B)Copy
C)Preserve
D)Save

Question 62

After each comparison,the binary search algorithm eliminates from consideration half the elements in the array that's being searched.

Question 63

The linear search method works best for searching arrays.

A)small and sorted
B)large and sorted
C)small and unsorted
D)large and unsorted

Question 64

The ReDim statement is used only to expand an array.

Question 65

In array items,which expression below will retrieve the value at row 3 and column 5?

A)items( 3 ).( 5 )
B)items( 3( 5 ))
C)items( 3 )( 5 )
D)items( 3,5 )

Question 66

What does the ReDim statement allow for?

A)Expanding any dynamic data structure.
B)Re-declaring a variable.
C)Expanding an array.
D)None of the above.

Question 67

The binary search method only works for searching arrays.

A)small
B)large
C)sorted
D)unsorted

Question 68

A RadioButton is known as a switch button because it can be in only the "on" (True)state or the "off" (False)state.

Question 69

A linear search always compares every element in an array to a certain key value.

Question 70

For the array in the previous question,what is the value returned by items( 1,0 )?

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

Question 71

The ReDim statement will automatically save the data stored in the array.

Question 72

RadioButtons can be separated into several groups,but all of the groups must be in the same container (typically a GroupBox).

Question 73

Which statement below initializes array items to contain 3 rows and 2 columns?

A)Dim items(,)As Integer = {{ 2,4 },{ 6,8 },{ 10,12 }}
B)Dim items(,)As Integer = {{ 2,6,10 },{ 4,8,12 }};
C)Dim items(,)As Integer = { 2,4 },{ 6,8 },{ 10,12 };
D)Dim items(,)As Integer = { 2,6,10 },{ 4,8,12 };

Question 74

The ReDim statement enables you to dynamically change the array size,type of the array elements,and the number of dimensions in the array.

Question 75

How many RadioButtons in a group can be selected at a time?

A)0
B)1
C)2
D)all of them

Question 76

A __________ event occurs when a RadioButton is either selected or deselected.

A)SelectChanged
B)CheckedChanged
C)SelectDeselect
D)None of the above

Question 77

Rectangular arrays are often used to represent tables of values consisting of information arranged in:

A)rows
B)columns
C)both a and b
D)None of the above

Question 78

Multi-dimensional arrays require two or more indices to identify particular elements.

Question 79

An array with m rows and n columns is not:
I.An m-by-n array.
II.An n-by-m array.
III.A two-dimensional array.
IV.A dual-transcripted array.

A)I and III
B)I and IV
C)II and IV
D)II and III