Chapter 3

What is the result of the following Boolean expression, given that x = 5, y = 3, and z = 8? x < y and z > x

False

Decision structures are also known as selection structures.

True

In Python the __________ symbol is used as the equality operator.

==

Expressions that are tested by the if statement are called Boolean expressions.

True

Nested decision statements are one way to test more than one condition.

True

Which of the following is the correct if clause to determine whether y is in the range 10 through 50, inclusive?

c. if y >= 10 and y <= 50:

A(n) ___________ expression is made up of two or more Boolean expressions.

compound

In flowcharting, the __________ symbol is used to represent a Boolean expression.

diamond

The decision structure that has two possible paths of execution is known as

dual alternative

Python provides a special version of a decision structure known as the __________ statement, which makes the logic of the nested decision structure simpler to write.

if-elif-else

When using the __________ logical operator, one or both of the subexpressions must be true for the compound expression to be true.

or

in Python the __________ symbol is used as the not-equal-to operator.

!=

Python allows you to compare strings, but it is not case sensitive.

False

Python uses the same symbols for the assignment operator as for the equality operator.

False

Short -circuit evaluation is only performed with the not operator.

False

The Python language is not sensitive to block structuring of code.

False

The not operator is a unary operator which must be used in a compound expression.

False

What is the result of the following Boolean expression, given that x = 5, y = 3, and z = 8? x < y or z > x

False

What is the result of the following Boolean expression, given that x = 5, y = 3, and z= 8? not (x < y or z > x) and y < z

False

An action in a single alternative decision structure is performed only when the condition is true.

True

The if statement causes one or more statements to execute only when a Boolean expression is true.

True

A Boolean variable can reference one of two values which are

True or False

When using the __________ logical operator, both subexpressions must be true for the compound expression to be true.

and

Multiple Boolean expressions can be combined by using a logical operator to create __________ expressions.

compound

In a decision structure, the action is ___________ executed because it is performed only when a specific condition is true.

conditionally

A(n) __________ structure is a logical design that controls the order in which a set of statements execute.

control

Boolean variables are commonly used as __________ to indicate whether a specific condition exists.

flags

The ___________ statement is used to create a decision structure.

if

Which of the following is the correct if clause to determine whether choice is anything other than 10?

if choice != 10:

A(n) __________ statement will execute one block of statements if its condition is true or another block if its condition is false.

if-else

The logical __________ operator reverses the truth of a Boolean expression.

not

Which logical operators perform short-circuit evaluation?

or, and

A(n) __________ operator determines whether a specific relationship exists between two values.

relational

A(n) __________ decision structure provides only one alternative path of execution.

single alternative

What does the following expression mean? x <= y

x is less than or equal to y