Question 1

A ______-controlled loop uses a true/false condition to control the number of times that it repeats.a. Booleanb. conditionc. decisiond. count

Accepted Answer

b. condition

Question 2

A ______-controlled loop repeats a specific number of times.a. Boolean b. conditionc. decisiond. count

Accepted Answer

d. count

Question 3

Each repetition of a loop is known as a(n) ______.a. cycleb. revolutionc. orbitd. iteration

Accepted Answer

d. iteration

Question 4

The While loop is a ______ type of loop.a. pretestb. posttestc. prequalifiedd. post iterative

Accepted Answer

a. pretest

Question 5

The Do-While loop is a ______ type of loop.a. pretestb. posttestc. prequalifiedd. post iterative

Accepted Answer

b. posttest

Question 6

The For loop is a ______ type of loop.a. pretestb. posttestc. prequalifiedd. post iterative

Accepted Answer

a. pretest

Question 7

A(n) ______ loop has no way of ending and repeats until the program is interrupted.a. indeterminateb. interminablec. infinited. timeless

Accepted Answer

c. infinite

Question 8

A ______ loop always executes at least once.a. pretestb. posttestc. condition-controlledd. count-controlled

Accepted Answer

b. posttest

Question 9

A(n) ______ variable keeps a running total.a. sentinelb. sumc. totald. accumulator

Accepted Answer

d. accumulator

Question 10

A(n) ______ is a special value that signals when there are no more items from a list of items to be processed. This value cannot be mistaken as an item from the list.a. sentinel b. flagc. signald. accumulator

Accepted Answer

a. sentinel

Question 11

True or False. A condition-controlled loop always repeats a specific number of times.

Accepted Answer

False

Question 12

True or False. The While loop is a pretest loop

Accepted Answer

True

Question 13

True or False. The Do-While loop is a pretest loop.

Accepted Answer

False

Question 14

True or False. You should not write code that modifies the contents of the counter variable in the body of a For loop.

Accepted Answer

True

Question 15

True or False. You cannot display the contents of the counter variable in the body of a loop.

Accepted Answer

False

Question 16

True or False. It is not possible to increment a counter variable by any value other than 1.

Accepted Answer

False

Question 17

True or False. The following statement decrements the variable x: Set x = x - 1.

Accepted Answer

True

Question 18

True or False. It is not necessary to initialize accumulator variables.

Accepted Answer

False

Question 19

True or False. In a nested loop, the inner loop goes through all of its iterations for every single iteration of the outer loops.

Accepted Answer

True

Question 20

True or False. To calculate the total number of iterations of a nested loop, add the number of iterations of all the loops.

Accepted Answer

False

Question 21

Why should you indent the statements in the body of a loop?

Accepted Answer

By indenting the that statements in the body of the loop you visually set them apart from the surrounding code. This makes your program easier to read and debug. Also, this is similar to the style that most programmers follow when writing loops in actual code.

Question 22

Describe the difference between pretest loops and posttest loops.

Accepted Answer

Pretest loops tests its condition before performing an iteration. Because the test is done at the beginning of the loop, you usually have to perform some steps prior to the loop to make sure that the loop executes at least once.Posttest loops performs an iteration before testing its condition. The posttest loop always perform at least once iteration even if its condition is false to begin with.

Question 23

What is a condition-controlled loop?

Accepted Answer

A condition-contrlled loop uses a true/false condition to control the number of times that it repeats.

Question 24

What is a count-controlled loop?

Accepted Answer

A count-controlled loop iterates a specific number of times.

Question 25

What three actions do count-controlled loops typically perform using the counter variable?

Accepted Answer

Initialization, Test, and Increment

Question 26

What is an infinite loop? Write the code for an infinite loop.

Accepted Answer

An infinite loop continues to repeat until the program is interrupted. Infinite loops usually occur when the programmer forgets to write code inside the loop that makes the test condition false.Declare Integer awesome = 5While awesome > 0 set awesome = awesome + 1 display awesomeEnd While

Question 27

A For loop looks like what other loop in a flowchart?

Accepted Answer

While loop

Question 28

Why is it critical that accumulator variables are properly initialized?

Accepted Answer

When the loop finishes, the accumulator will contain the total of the numbers that were read by the loop. This is a critical step. Each time the loop reads a number, it adds it to the accumulator. If the accumulator starts with any value other than 0, it will not contain the correct total when the loop finishes.

Question 29

What is the advantage of using a sentinel?

Accepted Answer

When processing a long list of values with a loop, perhaps a better technique is to use a sentinel. A sentinel is a special value that marks the end of a list of items. When a program reads the sentinel value it knows it has reached the end of the list, so the loop terminates.

Question 30

Why must the value chosen for use as a sentinel be carefully selected?

Accepted Answer

A sentinel value must be unique enough that it will not be mistaken as a regular value in the list.

CSC 10 Chapter 5

Unlock all answers in this set

Haven't found what you need?