Deck 5: Looping

Question 1

The while loop is a(n) ________ loop, whereas the do-while loop is a(n) ________ loop.

A) finite, infinite
B) infinite, finite
C) simple, complex
D) pretest, post test
E) post test, pretest

Answer 1

D

Question 2

What will the following code print?
Num = 8;
Cout << --num << " ";
Cout << num++ << " ";
Cout << num;

A) 7 7 8
B) 7 8 8
C) 8 7 7
D) 8 7 8
E) None of these

Answer 2

A

Question 3

An initialization expression may be omitted from the for loop if no initialization is required.

Answer 3

True

Question 4

The ++ operator

A) is a unary operator.
B) adds one to the value of its operand.
C) can operate in prefix or postfix mode.
D) All of the above.
E) Both B and C, but not A.

Question 5

In a for statement, the ________ expression is executed only once.

A) initialization
B) test
C) repeat
D) validate
E) update

Question 6

A for statement contains three expressions: initialization, test, and

A) repeat.
B) validate.
C) update.
D) quit.
E) increment.

Question 7

A while loop is somewhat limited, because the counter can only count up, not down.

Question 8

To use files in a C++ program you must include the ________ header file.

A) file
B) iostream
C) fstream
D) Both A and B.
E) Both B and C.

Question 9

The statements in the body of a do-while loop are executed

A) exactly once.
B) at least once.
C) only if the test condition is initially True.
D) until the test condition becomes True.
E) forever until the user hits the break key.

Question 10

A variable that keeps a running total of data values is called a(n)

A) total.
B) sum.
C) accumulator.
D) counter.
E) loop control variable.

Question 11

The block of code in the body of a while statement can contain an unlimited number of statements, provided they are enclosed in a set of braces.

Question 12

To use an output file in a C++ program you must

A) make sure the file already exists.
B) create a file stream object that will "point to" (i.e. reference) the file.
C) open the file.
D) do all of the above.
E) do B and C, but not A.

Question 13

For data validation, it is best to use a(n)

A) if statement.
B) while loop.
C) for loop.
D) nested loop.
E) switch statement.

Question 14

The while loop has two important parts: a condition that is tested and a statement or block of statements that is

A) repeated as long as the condition is True.
B) repeated until the condition becomes True.
C) done once if the condition is True.
D) always done at least once, then repeated if the condition is True.
E) always skipped.

Question 15

When a loop is nested inside another loop, the outer loop goes through all its iterations for each iteration of the inner loop.

Question 16

________ are C++ operators that change their operands by one.

A) + and -
B) ++ and --
C) binary and unary
D) arithmetic and relational
E) conditional and relational

Question 17

A sentinel is a special value that

A) is used for data validation.
B) must be Boolean.
C) marks the end of a list of values.
D) must be a negative number.
E) is all of the above.

Question 18

You may define a(n) ________ in the initialization expression of a for loop.

A) new data type
B) new keyword
C) constant
D) variable
E) operator

Question 19

A while loop may have a semicolon after the test expression and before the body of the loop, but it is not required.

Question 20

To decrement a number means to increase its value.

Question 21

The ideal type of loop to use if you want a user to enter exactly 20 values is a(n) ________ loop.

A) do-while
B) for
C) sentinel controlled
D) infinite
E) nested

Question 22

You can nest a for loop inside another for loop, but cannot nest a while loop inside another while loop or a do-while loop inside another do-while loop.

Question 23

When a loop is nested inside another loop, the inner loop goes through all its iterations for each iteration of the outer loop.

Question 24

To ________ a value means to increase it.

A) decrement
B) increment
C) add up
D) accumulate
E) total

Question 25

A while loop is somewhat limited because the counter can only be incremented or decremented by one each time through the loop.

Question 26

If nothing within a while loop ever causes the condition to become false, a(n) ________ may occur.

A) null value
B) infinite loop
C) unexpected exit
D) compiler error
E) system crash

Question 27

To use files in a C++ program you must include the ________ header file.

A) fstream
B) iostream
C) file
D) Both A and B are needed.
E) Both B and C are needed.

Question 28

What will the following code print?
Num = 5;
Cout << num++ << " ";
Cout << num-- << " ";
Cout << --num;

A) 5 4 3
B) 5 5 4
C) 5 6 4
D) 5 6 5
E) 6 5 4

Question 29

The ideal type of loop to use for repeating a menu is a(n) ________ loop.

A) do-while
B) for
C) sentinel controlled
D) infinite
E) nested

Question 30

A(n) ________ is a variable that is regularly incremented or decremented each time a loop iterates.

A) counter
B) accumulator
C) sentinel
D) total
E) loop control variable

Question 31

The while loop has two important parts: a condition that is tested and a statement or block of statements that is executed

A) as long as the condition is True.
B) until the condition becomes True.
C) at least once.
D) exactly once.
E) Both A and C are True, but B and D are not.

Question 32

The statements in the body of a do-while loop are executed

A) only if the test condition is initially True.
B) at least once.
C) until the test condition becomes True.
D) until an exit statement is encountered.
E) forever until the user presses the break key.

Question 33

The ________ statement causes a loop to terminate early.

A) stop
B) break
C) quit
D) terminate
E) continue

Question 34

A(n) ________ is a variable that controls the number of times a loop iterates.

A) counter
B) accumulator
C) sentinel
D) total
E) loop control variable

Question 35

Before beginning to add value to it, an accumulator should be initialized to 1.

Question 36

A(n) ________ is a special value that marks the end of a list of values.

A) counter
B) accumulator
C) sentinel
D) total
E) loop control variable

Question 37

If a while loop has no braces around the body of the loop

A) there is no loop body.
B) the loop body ends when the endwhile statement is encountered.
C) the loop body contains just one statement.
D) the program will not compile.
E) the program will compile, but not run.

Question 38

The -- operator

A) is a unary operator.
B) subtracts one from the value of its operand.
C) must have an lvalue, such as a variable, as its operand.
D) can be used in either prefix or postfix mode.
E) All of the above are True.

Question 39

The do-while loop is a(n) ________ loop, whereas the while loop is a(n) ________ loop.

A) finite, infinite
B) infinite, finite
C) simple, complex
D) pretest, post test
E) post test, pretest

Question 40

In order for a C++ program to read data from a file,

A) the file must already exist.
B) the program must define a file stream object that can "point to" (i.e., reference) the file.
C) the program must open the file.
D) All of the above are required.