Deck 5: Control Structures Ii Repetition

Question 1

Assume that all variables are properly declared.The following for loop executes 20 times.
for (i = 0; i <= 20; i++)
cout << i;

Answer 1

False

Question 2

The following while loop terminates when j > 20.
j = 0;
while (j < 20)
j++;

Answer 2

False

Question 3

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

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

Answer 3

C

Question 4

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 5

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

Question 6

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

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

Question 7

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 8

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

Question 9

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

Question 10

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

Question 11

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 12

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

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

Question 13

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

Question 14

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

Question 15

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

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

Question 16

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 17

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

Question 18

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

Question 19

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 20

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 21

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

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

Question 22

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

Question 23

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

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

Question 24

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 25

What is the output of the following loop?

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

Question 26

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

Question 27

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.

Question 28

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

Question 29

____ loops are called posttest loops.

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

Question 30

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 31

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 32

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 33

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

Question 34

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

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

Question 35

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

Question 36

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

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

Question 37

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

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

Question 38

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 39

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 40

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