Deck 10: Arrays

Question 1

Like other variables, an array must be declared with a data type, but the number of elements it contains is not declared.

Answer 1

False

Question 2

Declaring an array, like declaring a variable, does not necessarily give it a value.

Answer 2

True

Question 3

An array that has been loaded with data values is said to be "populated."

Answer 3

True

Question 4

Array subscripts are numbered with negative integers (whole numbers) starting with 0.

Question 5

You can define a numeric array named custNumber with 10 elements like this:
Declare Numeric custNumber = 10

Question 6

A For loop is an excellent tool for traversing an array.

Question 7

Because the first element has a subscript of 1, the subscripts for an array of 10 elements range from 0 to 10.

Question 8

In JavaScript, an array can be declared and instantiated in one statement.

Question 9

A limitation of the For loop is that it is designed for counter-controlled loops, in which only one condition is used to determine when to quit.

Question 10

The For loop's syntax makes it easy to use multiple conditions.

Question 11

When an array has already been sorted and you are looking for only a single match, search algorithms other than a sequential search are more efficient, even with a Boolean flag for an early exit.

Question 12

An easy way to create a sorted array is to increment the value of each element as you increment the subscript.

Question 13

A binary search will work whether or not values in the array have been sorted first.

Question 14

An array has a single name and data type.

Question 15

In arrays where values are expected to occur only once (such as ID numbers), a search normally ends when a single match is found.

Question 16

In arrays that might have multiple occurrences of values, such as an array of last names in a parallel array, a search normally lists all matches, along with values from other parallel arrays.

Question 17

An array can be thought of as a list of variables, each numbered with its subscript.

Question 18

A two-dimensional array has three subscripts.

Question 19

-The above table represents a one-dimensional array.

Question 20

A For loop works well to traverse a one-dimensional array

Question 21

Languages in which arrays are objects, including JavaScript, implement a two-dimensional array as an array of arrays, so separate brackets must be used for the subscripts.

Question 22

In JavaScript, two-dimensional arrays are implemented by making each array element contain an array object of its own.

Question 23

A one-dimensional array in JavaScript is an array of arrays.

Question 24

To assign values to a 2-D array in JavaScript, create a one-dimensional array as usual, and then add a for loop that sets each array element to an array of its own.

Question 25

If a two-dimensional array is organized in rows and columns, its values can be displayed row by row for easy readability.

Question 26

The solution for keeping multiple occurrences of similar variables is a(n) ____.

A) subscript
B) truth table
C) array
D) decision table

Question 27

An array is a collection of variables called ____, each with the same name and data type.

A) elements
B) subscripts
C) variables
D) sentinels

Question 28

A(n) ____ is a nonnegative integer used to identify an element in an array.

A) sentinel
B) subscript
C) iteration
D) counter

Question 29

What is the size of the following array?
Declare Numeric custNumber[10]
//Load custNumber array
CustNumber[0] = 10001
CustNumber[1] = 10643
CustNumber[2] = 10922
CustNumber[3] = 11532
CustNumber[4] = 11765

A) 2
B) 5
C) 10
D) 15

Question 30

Based on the information below, what is the value in the fourth position of the array?
Declare Numeric custNumber[10]

//Load custNumber array
CustNumber[0] = 10001
CustNumber[1] = 10643
CustNumber[2] = 10922
CustNumber[3] = 11532
CustNumber[4] = 11765

A) 10001
B) 10643
C) 10922
D) 11532

Question 31

Based on the information below, what is the value of the first element?
Declare Numeric custNumber[10]
//Load custNumber array

CustNumber[0] = 10001
CustNumber[1] = 10643
CustNumber[2] = 10922
CustNumber[3] = 11532
CustNumber[4] = 11765

A) 10001
B) 10643
C) 10922
D) 11532

Question 32

Based on the information below, which of the following sets the tenth element of the array to 20643?
Declare Numeric custNumber[10]

A) custNumber[10] = 20643
B) custNumber[9] = 20643
C) custNumber[8] = 20643
D) custNumber[7] = 20643

Question 33

Which of the following is considered an interactive array?

A) Declare Numeric numbersEntered[numEntries]
B) For index = 0 to SIZE - 1
CustNumber[index] = 0
End For

C) Declare String vegetables[] = "asparagus", "beans", "carrots"

D) Declare index
For index = 0 to SIZE - 1
Display "Enter the customer ID for subscript " + index
Input custNumber[index]
End For

Question 34

JavaScript arrays are objects created (instantiated) with the keyword ____.

A) var
B) new
C) start
D) Display

Question 35

Which of the following creates an array of five book titles?

A) var bookTitles = new Array(5);
B) var bookTitles = Array(5);
C) var bookTitles = new Array(0 to 5);
D) var SIZE = 5; var bookTitles;
BookTitles = new Array(SIZE-1);

Question 36

Which of the following creates an array with the elements 5, 19, 25, and 4?

A) myArray = new Array(5, 19, 25, 4);
B) var myArray = new Array(5, 19, 25, 4);
C) myArray = Array(5, 19, 25, 4);
D) var myArray = Array(5, 19, 25, 4);

Question 37

A shorthand notation for decrementing a variable is ____.

A) variable++
B) variable=+
C) variable--
D) variable+-

Question 38

A shorthand notation for incrementing a variable is ____.

A) variable++
B) variable=+
C) variable--
D) variable+-

Question 39

____ is the process of examining the elements of an array in order, looking for a match for a specific value.

A) Bubble sort
B) Sequential search
C) Heap sort
D) Shell sort

Question 40

The following algorithm depicts a ____ search.
// Prompt for customer number, search array for matches
Declare Numeric searchValue
Declare Numeric index = 0
Display "Enter the customer number you're looking for: "
Input searchValue

For index = 0 to SIZE - 1
If custNumber[index] == searchValue Then
Display "Match found at subscript: " + index
End If
End For

A) binary search
B) sequential search
C) parallel search
D) multidimensional search

Question 41

A search algorithm that's more efficient on large arrays-meaning it requires far fewer comparisons-is a ____.

A) sequential search
B) selection search
C) binary search
D) repetition search

Question 42

A ____ checks whether the search value is lower or higher than an element in the array, adjusting the limits of the array's searchable area with each comparison.

A) sequential search
B) selection search
C) binary search
D) repetition search

Question 43

____ use a common subscript to relate data fields.

A) Two-dimensional arrays
B) Parallel arrays
C) Multidimensional arrays
D) Single arrays

Question 44

____ arrays have a single name and data type, but they use two or more subscripts to identify a particular element.

A) Multidimensional
B) Single
C) Parallel
D) Sequential

Question 45

Which of the following statements is correct?

A) Case structures are ideal for traversing two-dimensional arrays.
B) Nested For loops are ideal for traversing two-dimensional arrays.
C) Do while loops are ideal for traversing two-dimensional arrays.
D) Nested For loops are ideal for traversing one-dimensional arrays.

Question 46

JavaScript uses which of the following notations for the first element of a two-dimensional array: ____.

A) [0][1]
B) [1][0]
C) [0][0]
D) [1][1]

Question 47

Based on the information below, how would you access the first index of the array?
Var x = [0, 1, 2, 3, 4, 5];
Var y = [x];

A) document.write(y[0]);
B) document.write(y[0][0]);
C) document.write(y[3]);
D) document.write(y[0][1]);

Question 48

Based on the information below, what is the value of the third index array x?
Var x = [0, 1, 2, 3, 4, 5];
Var y = [x];

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

Question 49

Which of the following is a three-dimensional array?

A) var SIZE = 5000000;
Var numberArray = new Array(SIZE);

B) Declare Constant SIZE = 1000
Declare Numeric empNumber[SIZE]
Declare String empLastName[SIZE], empFirstName[SIZE]
Declare Numeric index
Declare String moreInput = "Y"
For index = 0 to SIZE - 1
EmpNumber[index] = 0
EmpLastName[index] = ""
EmpFirstName[index] = ""
End For

C) var ROWS = 4;
Var COLUMNS = 6;
Var scores = new Array(ROWS);
For (index = 0; index < ROWS; index++) {
Scores[index] = new Array(COLUMNS);
}

D) var cube = new Array();
Cube[0] = new Array();
Cube[0][0] = new Array();

Question 50

Which of the following will cause a syntax error?

A) for (index = 0; index < 6000000;) {
X = 123.456789 / 987.654321;
}

B) numberArray = new Array(SIZE);

C) for (index = 0; index < SIZE; index++) {
NumberArray[index] = index + 1;
}

D) for (index = 0; index < SIZE; index++) {
BookTitles[index] = prompt
("Enter title for book #" + (index + 1) + ":",ES);
}