Deck 20: Iteration Principles

Question 1

The control specification of the for loop includes three operations: <initialization>, <continuation>, and <next iteration> .

Answer 1

True

Question 2

A for loop continues as long as the <continuation> test is true .

Answer 2

True

Question 3

The starting point for a for loop is always 0 .

Answer 3

False

Question 4

The step size of a for loop is always 1 .

Question 5

Loops cannot count backwards .

Question 6

Iteration variables must always be single letter identifiers .

Question 7

The iteration variable is often used in computations in the <statement list> .

Question 8

Iteration variables should be declared with the keyword iter instead of var because they are special variables .

Question 9

All for loops should have a <continuation> test .

Question 10

The <continuation> operation of a for loop has the same form as the predicate in a conditional statement .

Question 11

You can put a loop inside another loop .

Question 12

You cannot put a conditional statement inside a loop .

Question 13

An array index must be a non-negative integer .

Question 14

The off-by-one error is an uncommon error in computing .

Question 15

Image prefetching can be performed at any time prior to the start of the associated animation .

Question 16

If the loop initialization of a for loop makes the continuation test false, the loop body will only execute once .

Question 17

A World-Famous Iteration (WFI) loop which has n iterations generates exactly all the legal subscripts for an array of size n .

Question 18

Anything you can do by modifying the DOM could also be done with the document . write() function .

Question 19

Timers can be set but not canceled .

Question 20

Which of the following controls the number of iterations of a for loop?

A) function
B) iteration variable
C) incrementization
D) initialization

Question 21

How many iterations will occur in the following loop?
For (again = 0; again < 5; again++) { . . . . }

A) six
B) five
C) four
D) cannot tell

Question 22

For the elements of an array to store images, they must each be initialized to a(n)

A) prefetch object
B) src object
C) gifpix object
D) image object

Question 23

Which of the following will create a loop that will iterate ten times?

A) for (i = 0; i <=10; i = i + 1)
B) for (i = 1; i < 10; i = i + 1)
C) for (i = 0; i <10; i = i + 1)
D) None of these

Question 24

Which of the following is an infinite loop?

A) for (k = 1; k <= 4; k = k + 1)
B) for (k = 1; k < 3; k = k + 1)
C) for (k = 0; k <= 10; k = k + 1)
D) for (k = 1; k <= 4; k = k - 1)

Question 25

Which of the following is the correct code for the step size of the loop shown to ensure that the loop will repeat exactly five times?
For ( c = 3; c < 13; ________)

A) c = c + 2
B) c++
C) c = c + 3
D) c = c + 4

Question 26

Which of the following is the correct way to declare an array named myArray with ten elements?

A) var myArray = new(10);
B) myArray = new var(10);
C) var myArray = new Array(10);
D) new myArray = Array(10);

Question 27

Which of the following is the standard form for the World-Famous Iteration?

A) for (i = 0; i <= n; i++) { . . . }
B) for (i = 1; i < n; i++) { . . . }
C) for (i = 0; i < n; i++) { . . . }
D) None of these

Question 28

Which of the following statements is TRUE about the following JavaScript declaration?var rows = new Array(5);

A) The array will have six items .
B) The first item in the array will be rows[0] .
C) The last item in the array will be rows[5] .
D) All of these are true .

Question 29

In a for loop, the operation that sets the variable's value for the first iteration of the loop is the

A) initialization
B) test
C) condition
D) iteration

Question 30

The clearTimeout() function is used to

A) restart the timer
B) reset the interval of the timer
C) cancel the timer
D) reset the number of times the timer runs

Question 31

If you have a nested loop structure where the outside loop runs five times and the inside loops runs seven times, the statements of the inside loop will be executed ________ times .

A) seven
B) five
C) twelve
D) thirty-five

Question 32

On a web page, images can be loaded and stored in a(n)

A) image array
B) form load
C) image object
D) pic array

Question 33

Given the following JavaScript code, which of the following is the handle?
TimerID = setTimeout("animate()", 30);
ClearTimeout(timerID);

A) setTimeout()
B) clearTimeout()
C) clearTimeout(timerID)
D) timerID

Question 34

Given the following JavaScript code, which of the following is the event handler?
TimerID = setTimeout("animate()", 30);
ClearTimeout(timerID);

A) setTimeout()
B) animate()
C) setTimeout(animate())
D) timerID

Question 35

In programming ________ means looping through a series of statements to repeat them .

Question 36

The proper programming term for <continuation> is ________ test because it checks to see if the loop should terminate .

Question 37

The ________ size is the amount that an iteration variable is changed after each cycle of a for loop .

Question 38

In JavaScript '\n' is the ________ symbol .

Question 39

The point at which array indexing begins (the least index) is the index ________ .

Question 40

The index origin in JavaScript is ________ .

Question 41

A(n) ________ is an indexed base name .

Question 42

An array index is also called a(n) ________ .

Question 43

In animation, one of many images that is rapidly redrawn to create the illusion of motion is known as a(n) ________ .

Question 44

In JavaScript, i++ is an example of ________ notation and means the same as i = i + 1 .

Question 45

Loading images ahead of time is called ________ .

Question 46

The number of elements in an array is referred to as the array ________ .

Question 47

A(n) ________ is the common name for the repetition of a block of programming code .

Question 48

A(n) ________ is the single still image in a series of rapidly moving still images .

Question 49

In JavaScript, timers ________ a thousand times per second .

Question 50

If myArray is an array of length 10, the largest subscript is ________ .

Question 51

A JavaScript program can change the content of a page that is already displayed by changing the ________ .

Question 52

The timed event code that displays an animation must update the displayed frame and finally set the ________ so the next frame will be displayed .