Deck 5: Looping

Question 1

What keyword(s) should you use to initiate a for-loop in C#?

A) while
B) do
C) repeat each
D) for

Answer 1

D

Question 2

Unlike the while and for loops, the do loop is considered to be in what category of loops?

A) intest loops
B) pretest loops
C) posttest loops
D) fortest loops

Answer 2

C

Question 3

What type of loop allows you to indicate the starting value for the loop control variable, the test condition that controls loop entry, and the expression that alters the loop control variable, all in one convenient place?

A) for
B) do
C) repeat
D) while

Answer 3

A

Question 4

Loops that are controlled by reducing a variable are utilizing what type of loop control variable?

A) incrementing
B) comparing
C) decrementing
D) expanding

Question 5

A bug has resulted in your program executing an infinite loop.What key can be pressed in conjunction with the C or Break (Pause) key to escape the loop?

A) Esc
B) Ctrl
C) Shift
D) Alt

Question 6

Many loop control variable values rely on an added value through each loop.What type of loop control variable is this?

A) A comparing loop control variable.
B) A reducing loop control variable.
C) An expanding loop control variable.
D) An incrementing loop control variable.

Question 7

A Boolean expression is evaluated within every while loop to determine whether the loop body will execute.

Question 8

What type of loop checks a Boolean expression at the "bottom" of the loop after each repetition has occurred?

A) do
B) for
C) switch
D) while

Question 9

You cannot use a while loop for indefinite loops.

Question 10

Both the while loop and for loops are considered to be in what category of loops?

A) posttest loops
B) pretest loops
C) intest loops
D) for-test loops

Question 11

What is any single execution of a loop referred to as?

A) A lap of the loop.
B) An iteration of the loop.
C) A path through the loop.
D) A round in the loop.

Question 12

You can improve loop performance by using prefix incrementing.

Question 13

Statements in a for loop body cannot be blocked.

Question 14

What type of loop checks a Boolean expression at the "top" of the loop before the body has a chance to execute?

A) do
B) repeat
C) switch
D) while

Question 15

A loop for which the number of iterations is predetermined is known as what type of loop?

A) indefinite
B) infinite
C) while
D) definite

Question 16

When loop structures are nested, the inner loop must be entirely contained within the outer loop; loops can never overlap.

Question 17

A loop that is controlled by user input rather than altered by arithmetic is known as what type of loop?

A) definite
B) indefinite
C) sentinel
D) infinite

Question 18

What type of loop is one in which the loop control variable is tested after the loop body executes?

A) posttest
B) intest
C) fortest
D) pretest

Question 19

What are the block of statements that are executed in a loop considered to be part of?

A) a loop body
B) an iteration block
C) the loop header
D) the loop block

Question 20

When using nested loops, what loop is contained entirely within an outer loop?

A) posttest loop
B) pretest loop
C) inner loop
D) for loop

Question 21

Why do event-driven GUI programs sometimes require fewer coded loops than their counterpart console applications?

A) Some events are determined by the user's actions when the program is running.
B) GUI programs have better loop performance and can benefit more from loop fusion.
C) A GUI's properties removes the need for some loops.
D) A GUI program can utilize loop nesting, while a console program cannot.

Question 22

A value such as a 'Y' or 'N' that must be supplied in order to stop a loop is known as what type of value?

A) control value
B) sentinel value
C) stop value
D) switch value

Question 23

When a loop might execute many times, it becomes increasingly important to consider the number of evaluations that take place.How can considering the order of evaluation of short-circuit operators affect the performance of a loop?

Question 24

You are writing a program that defines a variable within a loop, and then tries to use that variable outside the loop.However, the program does not run as intended.What is the issue?

A) The variable is being overwritten inside the loop.
B) The variable is declared with an incorrect type.
C) The variable is limited to the scope of the loop.
D) The variable name conflicts with a built in keyword.

Question 25

Write two code segments that print the integers 1 through 10.One segment should use a while loop and the other should use a for loop.

Question 26

When using a nested loop, what should always be thought of as the all-encompassing loop?

A) inner loop
B) outer loop
C) while loop
D) for loop

Question 27

After executing your GUI program, you realize that your code has created an infinite loop.How can you break free of the loop in your GUI program?

A) Use Ctrl + C
B) Use Ctrl + Break
C) Close the Frame that hosts the application
D) Close the IDE

Question 28

What are three common ways that the value of a loop control variable is changed during the loop's execution?

Question 29

What should an accumulator variable be set to before it is used to accumulate a total?

A) 1
B) false
C) true
D) 0

Question 30

Why is it important to initialize an accumulator variable?

Question 31

What technique can be used to combine two different loops into one?

A) pretesting loop
B) short-circuiting loop
C) loop accumulation
D) loop fusion

Question 32

The expressions in each part of an AND or OR expression are evaluated only as much as necessary to determine whether the entire expression is true or false.What type of evaluation is this?

A) while
B) stopwatch
C) short-circuit
D) loop

Question 33

When writing a while loop, how can you ensure that it will end correctly?

Question 34

Suppose a loop should execute while x is less than the sum of two integers, a and b.The loop could be written as:
while(x < a + b)
// loop body
Although this code fragment will run, it is not particularly efficient.In what way is it inefficient, and how could you improve the loop's performance?

Question 35

Briefly describe the structure of a for loop.

Question 36

What is a garbage value in the C# programming language?

A) It is an unknown, unassigned value.
B) It is a variable that is assigned a value that has no purpose.
C) It is a variable that is used as a placeholder.
D) It is a variable that holds output text after it is displayed.

Question 37

Write a short program that prints Hello on the console four times using a while loop.

Question 38

What tasks can be performed in the three sections of a for loop in addition to initializing a single variable, testing the variable, and incrementing it?

Question 39

Statements in a while loop or for loop body can be blocked.Write a for loop that displays Hello and Goodbye four times each using a blocked loop body.

Question 40

Totals that are summed one at a time in a loop are known as what type of totals?

A) decremented
B) incremented
C) derived
D) accumulated