Deck 4: Control Structures I Selection

Question 1

Which of the following is a relational operator?

A) =
B) ==
C) !
D) &&

Answer 1

B

Question 2

A compound statement functions as if it was a single statement.

Answer 2

True

Question 3

Suppose x is 5 and y is 7.Choose the value of the following expression:

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

Answer 3

B

Question 4

In C++, both ! and != are relational operators.

Question 5

Which of the following is the "not equal to" relational operator?

A) !
B) |
C) !=
D) &

Question 6

In a ____ control structure, the computer executes particular statements depending on some condition(s).

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

Question 7

If the expression in an assert statement evaluates to true, the program terminates.

Question 8

Suppose P and Q are logical expressions.The logical expression P && Q is true if both P and Q are true.

Question 9

In C++, && has a higher precedence than ||.

Question 10

Suppose that x is an int variable.Which of the following expressions always evaluates to true?

A) (x > 0) || ( x <= 0)
B) (x >= 0) || (x == 0)
C) (x > 0) && ( x <= 0)
D) (x > 0) && (x == 0)

Question 11

You can use either a(n) ____ or a ____ to store the value of a logical expression.

A) float, double
B) char, string
C) int, bool
D) float, string

Question 12

A control structure alters the normal sequential flow of execution in a program.

Question 13

The operators !, &&, and || are called relational operators.

Question 14

Which of the following operators has the lowest precedence?

A) !
B) ||
C) &&
D) =

Question 15

The result of a logical expression cannot be assigned to an int variable, but it can be assigned to a bool variable.

Question 16

Which of the following operators has the highest precedence?

A) !
B) *
C) %
D) =

Question 17

In C++, the operators != and == have the same order of precedence.

Question 18

What does <= mean?

A) less than
B) greater than
C) less than or equal to
D) greater than or equal to

Question 19

The expression (x >= 0 && x <= 100) evaluates to false if either x < 0 or x >= 100.

Question 20

Which of the following expressions correctly determines that x is greater than 10 and less than 20?

A) 10 < x < 20
B) (10 < x < 20)
C) 10 < x && x < 20
D) 10 < x || x < 20

Question 21

Which of the following will cause a logical error if you are attempting to compare x to 5?

A) if (x == 5)
B) if (x = 5)
C) if (x <= 5)
D) if (x >= 5)

Question 22

Putting ____________________ in front of a logical expression reverses the value of that logical expression.

Question 23

In a switch statement, if the value of the expression does not match any of the case values, the statements following the ____________________ label execute.

Question 24

The ____________________ of relational and logical operators is said to be from left to right.

Question 25

When one control statement is located within another, it is said to be ____.

A) blocked
B) compound
C) nested
D) closed

Question 26

Assume you have three int variables: x = 2, y = 6, and z.Choose the value of z in the following expression: z = (y / x > 0) ? x : y;.

A) 2
B) 3
C) 4
D) 6

Question 27

Consider the following statements.
If score is equal to 75, the value of grade is "____________________".

Question 28

The value of the expression 6 < 5 || 'g' > 'a' && 7 < 4
is ____________________.

Question 29

What is the value of x after the following statements execute? int x;
X = (5 <= 3 && 'A' < 'F') ? 3 : 4

A) 2
B) 3
C) 4
D) 5

Question 30

Suppose found = true and num = 6.The value of the expression (!found) || (num > 6) is ____________________.

Question 31

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

A) 2
B) 5
C) 8
D) 10

Question 32

The term ____________________ describes a process in which the computer evaluates a logical expression from left to right and stops as soon as the value of the expression is known.

Question 33

Once an input stream enters a(n) ____________________ state, all subsequent input statements associated with that input stream are ignored, and the computer continues to execute the program, which produces erroneous results.

Question 34

Putting a semicolon after the parentheses following the expression in an if statement (that is, before the statement) is a(n) ____________________ error.

Question 35

You can disable assert statements by using which of the following?

A) #include
B) #define
C) #clear NDEBUG
D) #define NDEBUG

Question 36

Which of the following will cause a logical error if you are attempting to compare x to 5?

A) if (x == 5)
B) if (x = 5)
C) if (x <= 5)
D) if (x >= 5)

Question 37

What is the output of the following code?

A) section 2
B) section 3
C) section 4
D) section 5

Question 38

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

A) 35 45 80
B) 35 45 10
C) 35 45 -10
D) 35 45 0

Question 39

The value of the expression 7 + 8 <= 15 is ____________________.

Question 40

For a program to use the assert function, it must include which of the following?

A) #include
B) #include
C) #include
D) #include NDEBUG