Deck 3: Control Structures

Question 1

A control statement is a statement that determines the control flow of a set of instructions.

Answer 1

True

Question 2

"Control structure" is another name for a control statement.

Answer 2

False

Question 3

Sequential, selection and iterative control are all based on a given condition.

Answer 3

False

Question 4

Most programs are straight-line programs.

Question 5

Control flow refers to

A) the order that instructions are executed in a program
B) the speed at which a set of instructions are executed in a program
C) the changing values of variables in a program

Question 6

Which of the following provide explicit control flow in a program?

A) sequential, selection and iterative control statements
B) selection and iterative control
C) sequential and selection control

Question 7

Which of the following is not a fundamental form of control that programming languages provide?

A) sequential control
B) iterative control
C) secondary control

Question 8

Most computer programs use

A) sequential and selection control
B) sequential, selection and iterative control
C) sequential and iterative control

Question 9

Match the descriptions with their terms:

-based on a condition that is checked once

A) sequential control
B) selection control
C) iterative control

Question 10

Match the descriptions with their terms:

-implicit form of control

A) sequential control
B) selection control
C) iterative control

Question 11

Match the descriptions with their terms:

-based on a condition that may be checked many times

A) sequential control
B) selection control
C) iterative control

Question 12

The order that instructions are executed in a program is called _____________________.

Question 13

11. Statements that determine the flow of control of a set of instructions are called _____________________.

Question 14

The three forms of control provided by programming languages are ________________,__________, and __________________ control.

Question 15

Program that do not have any form of control flow other than sequential control are called__________________________.

Question 16

What is the term for the order that instructions are executed in a program?

Question 17

What is the term for a statement that determines the control flow of a set of instructions?

Question 18

What are the three forms of control flow provided by programming languages?

Question 19

Which of the three forms of control flow is implicit in a program?

Question 20

What is the term for a program that does not have any control flow, other than sequential control?

Question 21

Which forms of control flow require the use of a condition?

Question 22

Which form of control flow repeatedly executes a set of instructions?

Question 23

The Boolean data type contains two Boolean values?

Question 24

A Boolean expression is an expression that evaluates to True or False.

Question 25

All Boolean expressions contain at least one Boolean literal (value).

Question 26

Boolean literals True and False are considered Boolean expressions.

Question 27

All relational operators produce a Boolean result (value).

Question 28

The == operator is used for the assignment of Boolean values.

Question 29

The != operators is used to determine if two values are not equal to each other.

Question 30

The relational operators can be applied to string values.

Question 31

The Boolean expression 'Abe' < 'Apple' evaluates to true.

Question 32

The Boolean expression 'apple' < 'Banana' evaluates to true.

Question 33

The membership operator in of Python can be used to determine if a given value occurs in a particular tuple, or if a given substring occurs in a given string value.

Question 34

In order to determine if a certain value is not in a particular list (or string), the membership operator not in can be used.

Question 35

The operators and, or, not, ==, !=, <, <=, >, >= are called Boolean operators.

Question 36

1 <= num <= 10 is not a valid Boolean expression in most programming languages, but is allowed in Python.

Question 37

Operator precedence applies to the arithmetic operators and relational operators, but not to the Boolean operators.

Question 38

All Boolean operators are applied before any relational operators.

Question 39

Short-circuit evaluation is when a Boolean expression contains the invalid use of Boolean operators.

Question 40

not (num == 0) and num != 0 are logically equivalent Boolean expressions, for integer value num.

Question 41

not (num != 0) is logically equivalent to num < 0 and num > 0, for integer value num.

Question 42

num1 <= num2 is logically equivalent to not (num1 > num2), where num1 and num2 each contain an integer value.

Question 43

not (flag1 and flag2) is logically equivalent to (not flag1) and (not flag2), where flag1 and flag2 are Boolean values.

Question 44

not (flag1 or flag2) is logically equivalent to (not flag1) and (not flag2), where flag1 and flag2 are Boolean values.

Question 45

Which of the following is not a Boolean operator?

A) and
B) or
C) not
D) with

Question 46

Examine the following statements.
X = 10
X == 10
What will the second line evaluate to?

A) False
B) 10
C) True
D) None of the Above

Question 47

Examine the following expression:
10 < 20 and 30 > 50
What does this expression evaluate to?

A) True
B) False
C) True and False
D) That line of code is not valid in Python and will result in an error

Question 48

Examine the following expression.
10 in (10, 20, 30)
What will this expression evaluate to?

A) False
B) 10
C) True
D) None of the Above

Question 49

Match the expressions that they are logically equivalent to the Boolean expressions :

-not (x != y)

A) x < y
B) x <= y
C) x == y
D) x != y
E) not (x and y)
F) not (x or y)

Question 50

Match the expressions that they are logically equivalent to the Boolean expressions :

-(not x) or (not y)

A) x < y
B) x <= y
C) x == y
D) x != y
E) not (x and y)
F) not (x or y)

Question 51

Match the expressions that they are logically equivalent to the Boolean expressions :

-(not x) and (not y)

A) x < y
B) x <= y
C) x == y
D) x != y
E) not (x and y)
F) not (x or y)

Question 52

Match the expressions that they are logically equivalent to the Boolean expressions :

-not (x >= y)

A) x < y
B) x <= y
C) x == y
D) x != y
E) not (x and y)
F) not (x or y)

Question 53

Match the expressions that they are logically equivalent to the Boolean expressions :

-not (x == y)

A) x < y
B) x <= y
C) x == y
D) x != y
E) not (x and y)
F) not (x or y)

Question 54

Match the expressions that they are logically equivalent to the Boolean expressions :

-not (x > y)

A) x < y
B) x <= y
C) x == y
D) x != y
E) not (x and y)
F) not (x or y)

Question 55

True and False are the two _________ values in Python.

Question 56

A _____________ expression is an expression that evaluates to True or False.

Question 57

The Boolean operators in Python are _____, _____, and _____.

Question 58

Both the Boolean and _____________ operators evaluate to a Boolean result.

Question 59

Fill in the table, evaluating the Boolean expressions for x and y with the given values. Some have already been filled in.

Question 60

Evaluate the following Python expressions.

-14 <= 14

Question 61

Evaluate the following Python expressions.

-5 > 4 or 12 < 8

Question 62

Evaluate the following Python expressions.

-6 != 5

Question 63

Evaluate the following Python expressions.

-10 not in (10, 20, 30)

Question 64

Evaluate the following Python expressions.

-5 < 10 and 8 > 20 or 4 < 2

Question 65

Evaluate the following Python expressions.

-not (12 == 12 and 4 < 6)

Question 66

Evaluate the following Python expressions for the variable assignments given.


-num1 > num2 and flag1

Question 67

Evaluate the following Python expressions for the variable assignments given.


-num1 == 12 or num1 == num2 or flag1

Question 68

Evaluate the following Python expressions for the variable assignments given.


-num1 + 10 < num2 and flag2

Question 69

Evaluate the following Python expressions for the variable assignments given.


-not flag1 or not flag2 and num2 < num1

Question 70

For each of the following Boolean expressions, indicate the value of x that would make each expression false.
(a) x and True
(b) x or False
(c) not (x or False)
(d) not (x and True)

Question 71

Give an appropriate expression for each of the following:
-To determine if the number 25 appears in a list of numbers called nums.

Question 72

Give an appropriate expression for each of the following:
-To determine if the numbers 10 and 20 do not appear in a list of numbers named nums.

Question 73

Give an appropriate expression for each of the following:
-To determine if the name 'Charles' appears in a list called names.

Question 74

Give a logically equivalent expression for each of the following:
-num1 > 0 and num2 > 0

Question 75

Give a logically equivalent expression for each of the following:
-num1 <= 0 or num2 <= 0

Question 76

Give a logically equivalent expression for each of the following:
-not (num1 == 0 and num2 == 0)

Question 77

The if statement in Python provides selection control.

Question 78

If statements always make use of a Boolean expression.

Question 79

All if statements must include an else header.

Question 80

if Statements may contain as many else headers as necessary.