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

The expression in an if statement is sometimes called a(n) ____.

A) selection statement
B) action statement
C) decision maker
D) action maker

Answer 2

C

Question 3

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

Answer 3

True

Question 4

The operators != and == have the same order of precedence.

Question 5

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

Question 6

In C++, !, &&, and || are called relational operators.

Question 7

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

Question 8

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

Question 9

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

Question 10

What does <= mean?

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

Question 11

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

Question 12

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 13

Which of the following operators has the highest precedence?

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

Question 14

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

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

Question 15

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

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

Question 16

Suppose x is 5 and y is 7. Choose the value of the following expression: (x != 7) && (x <= y)

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

Question 17

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

Question 18

Which of the following operators has the lowest precedence?

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

Question 19

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

Question 20

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 21

To develop a program, you can use an informal mixture of C++ and ordinary language, called ____.

A) assert code
B) pseudocode
C) cppcode
D) source code

Question 22

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 23

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

Question 24

What is the output of the following C++ code? int x = 35;
Int y = 45;
Int z;
If (x > y)
Z = x + y;
Else
Z = y - x;
Cout << x << " " << y << " " << z << endl;

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

Question 25

What is the output of the following C++ code? int x = 55;
Int y = 5;
Switch (x % 7)
{
Case 0:
Case 1:
Y++;
Case 2:
Case 3:
Y = y + 2;
Case 4:
Break;
Case 5:
Case 6:
Y = y - 3;
}
Cout << y << endl;

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

Question 26

In C++, the logical operator AND is represented by ____________________.

Question 27

The symbol > is a(n) ____________________ operator.

Question 28

What is the output of the following code? char lastInitial = 'A';
Switch (lastInitial)
{
Case 'A':
Cout << "section 1" <Break;
Case 'B':
Cout << "section 2" <Break;
Case 'C':
Cout << "section 3" <Break;
Case 'D':
Cout << "section 4" <Break;
Default:
Cout << "section 5" <}

A) section 1
B) section 2
C) section 3
D) section 5

Question 29

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 30

The conditional operator ?: takes ____ arguments.

A) two
B) three
C) four
D) five

Question 31

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

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

Question 32

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 33

The appearance of = in place of == resembles a(n) ____.

A) syntax error
B) silent killer
C) compilation error
D) input failure

Question 34

A ____________________ operator allows you to make comparisions in a program.

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

What is the output of the following code fragment if the input value is 4? int num;
Int alpha = 10;
Cin >> num;
Switch (num)
{
Case 3:
Alpha++;
Break;
Case 4:
Case 6:
Alpha = alpha + 3;
Case 8:
Alpha = alpha + 4;
Break;
Default:
Alpha = alpha + 5;
}
Cout << alpha << endl;

A) 13
B) 14
C) 17
D) 22

Question 37

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

Question 38

What is the output of the following code? if (6 > 8)
{
Cout << " ** " << endl ;
Cout << "****" << endl;
}
Else if (9 == 4)
Cout << "***" << endl;
Else
Cout << "*" << endl;

A) *
B) **
C) ***
D) ****

Question 39

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

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

Question 40

What is the output of the following code? char lastInitial = 'S';
Switch (lastInitial)
{
Case 'A':
Cout << "section 1" <Break;
Case 'B':
Cout << "section 2" <Break;
Case 'C':
Cout << "section 3" <Break;
Case 'D':
Cout << "section 4" <Break;
Default:
Cout << "section 5" <}

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

Question 41

Every else must be paired with a(n) ____________________.

Question 42

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

Question 43

A(n) ____________________ structure does not require the evaluation of a logical expression.

Question 44

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

Question 45

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

Question 46

To output results correctly, the switch structure must include a(n) ____________________ statement after each cout statement, except the last cout statement.

Question 47

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 48

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

Question 49

Consider the following statements.
int score;
string grade;
if (score >= 65)
grade = "pass";
else
grade = "fail";
If score is equal to 75, the value of grade is "____________________".

Question 50

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.