Chapter 8

Question 1

TF

A Python while implements a definite loop.

Answer 1

False

Question 2

TF

The counted loop pattern uses a definite loop.

Answer 2

True

Question 3

TF

A sentinel loop asks the user whether to continue on each iteration.

Answer 3

False

Question 4

TF

A sentinel loop should not actually process the sentinel value.

Answer 4

True

Question 5

TF

The easiest way to iterate through the lines of a file in Python is to use a while loop.

Answer 5

False

Question 6

TF

A while loop is a post-test loop.

Answer 6

False

Question 7

TF

The Boolean operator or return True when both of its operands are true.

Answer 7

True

Question 8

TF
a and (b or c) == (a and b) or (a and c

Answer 8

True

Question 9

TF

not(a or b) == (not a) or not(b)

Answer 9

False

Question 10

TF

True or False

Answer 10

True

Question 11

A loop pattern that asks the user whether to continue on each iteration is called a(n)

Answer 11

Interactive loop

Question 12

A loop pattern that continues until a special value is input is called a(n)

Answer 12

sentinel loop

Question 13

A loop structure that tests the loop condition after executing the loop body is called a

Answer 13

Post-test-loop

Question 14

A priming read is part of the pattern for a(n)

Answer 14

sentinel loop

Question 15

What statement can be executed in the body of a loop to cause it to terminate?

Answer 15

Break

Question 16

Which of the following is not a valid rule of Boolean algebra?

Answer 16

It should be: not(a and b) == not(a) or not(b)

Question 17

A loop that never terminates is called

Answer 17

Infinite

Question 18

Which line would not be found in a truth table for and?

Answer 18

T F T

Question 19

Which line would not be found in a truth table for or?

Answer 19

F T F

Question 20

The term for an operator that may not evaluate one of its subexpressions is

Answer 20

Short-circuit