Deck 5: Control Structures II Repetition

Question 1

The control statements in the for loop include the initial statement, loop condition, and update statement.

Answer 1

True

Question 2

The number of iterations of a counter-controlled loop is known in advance.

Answer 2

True

Question 3

What is the output of the following C++ code?

A) 0
B) 6
C) 8
D) 10

Answer 3

D

Question 4

Assume that all variables are properly declared. The following for loop executes 20 times.

Question 5

The statement in the body of a while loop acts as a decision maker.

Question 6

Which of the following statements generates a random number between 0 and 50?

A) srand(time(0));
Num = rand() % 50;
B) srand(time(10));
Num = rand()/50;
C) srand(time(0));
Num = rand()50;
D) srand(time(10));
Num = rand() % 50;

Question 7

In the case of the sentinel-controlled while loop, the first item is read before the while loop is entered.

Question 8

In a counter-controlled while loop, the loop control variable must be initialized before the loop.

Question 9

What is the next Fibonacci number in the following sequence? 1, 1, 2, 3, 5, 8, 13, 21, ...

A) 34
B) 43
C) 56
D) 273

Question 10

The control variable in a flag-controlled while loop is a bool variable.

Question 11

Consider the following code. (Assume that all variables are properly declared.) This code is an example of a(n) ____ while loop.

A) sentinel-controlled
B) flag-controlled
C) EOF-controlled
D) counter-controlled

Question 12

The following while loop terminates when j > 20.

Question 13

Consider the following code. This code is an example of a(n) ____ while loop.

A) flag-controlled
B) counter-controlled
C) EOF-controlled
D) sentinel-controlled

Question 14

A loop that continues to execute endlessly is called a(n) ____ loop.

A) end
B) unhinged
C) infinite
D) definite

Question 15

In ____ structures, the computer repeats particular statements a certain number of times depending on some condition(s).

A) looping
B) branching
C) selection
D) sequence

Question 16

What is the output of the following C++ code?

A) 24 0
B) 24 1
C) 25 0
D) 25 1

Question 17

Assume all variables are properly declared. The output of the following C++ code is 2 3 4 5.

Question 18

A(n) ____-controlled while loop uses a bool variable to control the loop.

A) counter
B) sentinel
C) flag
D) EOF

Question 19

In a sentinel-controlled while loop, the body of the loop continues to execute until the EOF symbol is read.

Question 20

Suppose sum and num are int variables, and the input is 18 25 61 6 -1. What is the output of the following code?

A) 92
B) 109
C) 110
D) 119

Question 21

The ____________________ statement is typically used for two purposes:
• To exit early from a loop.
• To skip the remainder of a switch structure.

Question 22

Which of the following loops does not have an entry condition?

A) EOF-controlled while loop
B) sentinel-controlled while loop
C) do...while loop
D) for loop

Question 23

What is the output of the following loop?

A) St
B) Sto
C) Stop
D) This is an infinite loop.

Question 24

Which executes first in a do...while loop?

A) the statement
B) loop condition
C) the expression
D) update statement

Question 25

The ____ statement can be used to eliminate the use of certain (flag) variables.

A) while
B) switch
C) break
D) if

Question 26

What executes immediately after a continue statement in a while and do-while loop?

A) loop-continue test
B) update statement
C) loop condition
D) the body of the loop

Question 27

When a continue statement is executed in a ____, the update statement always executes.

A) while loop
B) for loop
C) switch structure
D) do...while loop

Question 28

A loop ____________________ is a set of statements that remains true each time the loop body is executed.

Question 29

To generate a random number, you can use the function rand of the header file ____________________.

Question 30

What is the initial statement in the following for loop? (Assume that all variables are properly declared.)

A) i = 1;
B) i < 20;
C) i++;
D) cout << "Hello World";

Question 31

Suppose sum, num, and j are int variables, and the input is 4 7 12 9 -1. What is the output of the following code?

A) 24
B) 25
C) 41
D) 42

Question 32

A semicolon at the end of the for statement (just before the body of the loop) is a(n) ____________________ error.

Question 33

The function eof is a member of the data type ____________________.

Question 34

What is the value of x after the following statements execute?

A) 5
B) 10
C) 20
D) 40

Question 35

Which of the following loops is guaranteed to execute at least once?

A) counter-controlled while loop
B) for loop
C) do...while loop
D) sentinel-controlled while loop

Question 36

____ loops are called posttest loops.

A) break
B) for
C) while
D) do...while

Question 37

Suppose j, sum, and num are int variables, and the input is 26 34 61 4 -1. What is the output of the code?

A) 124
B) 125
C) 126
D) 127

Question 38

Which of the following is a repetition structure in C++?

A) if
B) switch
C) while...do
D) do...while

Question 39

What is the output of the following C++ code?

A) 10
B) 10 10
C) 10 11
D) 11 11

Question 40

In a while and for loop, the loop condition is evaluated before executing the body of the loop. Therefore, while and for loops are called ____________________ loops.