Deck 5: Looping

Question 1

You begin a for statement with the keyword ____ followed by a set of parentheses.

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

Answer 1

D

Question 2

A loop for which the number of iterations is predetermined is called a(n) ____ loop.

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

Answer 2

D

Question 3

The ____ 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

Answer 3

D

Question 4

Many loop control variable values are altered by ____ (or adding to) them.

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

Question 5

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

Question 6

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

Question 7

The do  loop is a(n) ____ loop.

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

Question 8

You can improve loop performance by using prefix incrementing.

Question 9

Often, the value of a loop control variable is not altered by arithmetic, but instead is altered by user input. This type of loop is a(n) ____ loop.

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

Question 10

The ____ 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 11

Statements in a for loop body cannot be blocked.

Question 12

One execution of any loop is called a(n) ____.

A) lap
B) iteration
C) path
D) round

Question 13

With a ____ loop, you can 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

Question 14

When loops are nested, each pair contains a(n) ____ loop and an outer loop.

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

Question 15

You cannot use a while loop for indefinite loops.

Question 16

Some loops are controlled by ____ (or reducing) a variable and testing whether the value remains greater than some benchmark value.

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

Question 17

A while loop is a(n) ____ loop.

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

Question 18

If you ever find yourself in the midst of executing an infinite loop, you can break out by holding down the ____ key and pressing the C key or the Break (Pause) key.

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

Question 19

The block of statements executed in a loop is known as the ____.

A) loop body
B) iteration block
C) loop header
D) loop block

Question 20

A(n) ____ 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 21

Why is it important to initialize an accumulator variable?

Question 22

Often, totals are ____; that is, summed one at a time in a loop.

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

Question 23

The expressions in each part of an AND or OR expression use ____ evaluation; that is, they are evaluated only as much as necessary to determine whether the entire expression is true or false .

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

Question 24

Loop ____ is the technique of combining two loops into one.

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

Question 25

You can use a(n) ____________________ loop to execute a body of statements continuously as long as some condition continues to be true .

Question 26

Event-driven GUI programs sometimes require fewer coded loops than their counterpart console applications because some events are determined by the ____ when the program is running.

A) user's actions
B) loop performance
C) GUI's properties
D) loop nesting

Question 27

A value that a user must supply to stop a loop (for example, 'Y' or 'N' ) is called a(n) ____________________ value.

Question 28

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 29

When a variable is declared inside a loop, it can be referenced only for the duration of the loop body. Once the loop finishes execution, the variable is out of ____________________, which means it is not usable because it has ceased to exist.

Question 30

When you use a loop within a loop, you should always think of the ____ loop as the all-encompassing loop.

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

Question 31

A(n) ____________________ is a structure that allows repeated execution of a block of statements.

Question 32

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

Question 33

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
// 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 34

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 35

Because you need definite loops so frequently when you write programs, C# provides a shorthand way to create such a loop. This shorthand structure is called a(n) ____________________ loop.

Question 36

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 37

Briefly describe the structure of a for loop.

Question 38

An accumulator variable must be set to ____ before it is used to accumulate a total.

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

Question 39

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

Question 40

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

Question 41

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?