Week 4

Question 1

Reducing duplication of code is one of the advantages of using a loop structure.

Answer 1

True

Question 2

A good way to repeatedly perform an operation is to write the statements for the task once and then place the statements in a loop that will repeat as many times as necessary.

Answer 2

True

Question 3

In a flowchart, both the decision structure and the repetition structure use the diamond symbol to represent the condition that is tested.

Answer 3

True

Question 4

The first line in a while loop is referred to as the condition clause.

Answer 4

False

Question 5

In Python, an infinite loop usually occurs when the computer accesses an incorrect memory address.

Answer 5

False

Question 6

Both of the following for clauses would generate the same number of loop iterations.

Answer 6

True

Question 7

The integrity of a program’s output is only as good as the integrity of its input. For this reason, the program should discard input that is invalid and prompt the user to enter valid data.

Answer 7

True

Question 8

Functions can be called from statements in the body of a loop and loops can be called from within the body of a function.

Answer 8

False

Question 9

In a nested loop, the inner loop goes through all of its iterations for each iteration of the outer loop.

Answer 9

True

Question 10

To get the total number of iterations in a nested loop, add the number of iterations in the inner loop to the number in the outer loop.

Answer 10

False

Question 11

A while loop is called a pretest loop because the condition is tested after the loop has had one iteration.

Answer 11

False

Question 12

What type of loop structure repeats the code a specific number of times?
a. condition-controlled loop
b. number-controlled loop
c. count-controlled loop
d. Boolean-controlled loop

Answer 12

c. count-controlled loop

Question 13

What type of loop structure repeats the code based on the value of Boolean expression?
a. condition-controlled loop
b. number-controlled loop
c. count-controlled loop
d. Boolean-controlled loop

Answer 13

a. condition-controlled loop

Question 14

What are the values that the variable num contains through the iterations of the following for loop?
for num in range(2, 9, 2):
a. 2, 3, 4, 5, 6, 7, 8, 9
b. 2, 5, 8
c. 2, 4, 6, 8
d. 1, 3, 5, 7, 9

Answer 14

c. 2, 4, 6, 8

Question 15

What are the values that the variable num contains through the iterations of the following for loop?
for num in range(4):
a. 1, 2, 3, 4
b. 0, 1, 2, 3, 4
c. 1, 2, 3
d. 0, 1, 2, 3

Answer 15

d. 0, 1, 2, 3

Question 16

Which of the following is not an augmented assignment operator?
a. *=
b. /=
c. +=
d. <=

Answer 16

d. <=

Question 17

A variable used to keep a running total is called a(n)
a. accumulator
b. total
c. running total
d. summer

Answer 17

a. accumulator

Question 18

_________ is the process of inspecting data that has been input into a program in order to ensure that the data is valid before it is used in a computation.
a. Input validation
b. Correcting data
c. Data validation
d. Correcting input

Answer 18

a. Input validation

Question 19

A(n) __________ structure is a structure that causes a statement or a set of statements to execute repeatedly.
a. sequence
b. decision
c. module
d. repetition

Answer 19

repetition

Question 20

The first operation is called the __________ and its purpose is to get the first input value that will be tested by the validation loop.
a. priming read
b. first input
c. loop set read
d. loop validation

Answer 20

a. priming read

Question 21

When will the following loop terminate?
while keep_on_going != 999:
a. when keep_on_going refers to a value less than 999
b. when keep_on_going refers to a value greater than 999
c. when keep_on_going refers to a value equal to 999
d. when keep_on_going refers to a value not equal to 999

Answer 21

c. when keep_on_going refers to a value equal to 999

Question 22

In Python, a comma-separated sequence of data items that are enclosed in a set of brackets is called
a. sequence
b. variable
c. value
d. list

Answer 22

d. list

Question 23

In Python, the variable in the for clause is referred to as the __________ because it is the target of an assignment at the beginning of each loop iteration.
a. target variable
b. loop variable
c. for variable
d. count variable

Answer 23

a. target variable

Question 24

Which of the following represents an example to calculate the sum of numbers (that is, an accumulator), given that the number is stored in the variable number and the total is stored in the variable total?
a. total + number = total
b. number += number
c. total += number
d. total = number

Answer 24

c. total += number

Question 25

What will be displayed after the following code is executed? total = 0 for count in range(1,4): total += count print(total) a. 1 3 6 b. 5 c. 1 4 d. 6

Answer 25

d. 6

Question 26

What will be displayed after the following code is executed? total = 0 for count in range(4,6): total += count print(total) a. 4 9 b. 4 5 6 c. 4 5 d. 9

Answer 26

d. 9

Question 27

What will be displayed after the following code is executed? count = 4 while count < 12: print("counting") count = count + 2 a. counting counting counting counting b. counting counting counting counting c. counting counting d. counting counting counting

Answer 27

b. counting counting counting counting

Question 28

What will be displayed after the following code is executed? for num in range(0, 20, 5): num += num print(num) a. 30 b. 25 c. 0 5 10 15 20 d. 5 10 15

Answer 28

a. 30

Question 29

What does the following program do? student = 1 while student <= 3: total = 0 for score in range(1, 4): score = int(input("Enter test score: ")) total += score average = total/3 print("Student ", student, "average: ", average) student += 1 a. It accepts 4 test scores for 3 students and outputs the average of the 12 scores. b. It accepts 3 test scores for each of 3 students and outputs the average for each student. c. It accepts 4 test scores for 2 students, then averages and outputs all the scores. d. It accepts one test score for each of 3 students and outputs the average of the 3 scores.

Answer 29

b. It accepts 3 test scores for each of 3 students and outputs the average for each student.

Question 30

A(n) ___________ structure causes a set of statements to execute repeatedly.

Answer 30

repetition

Question 31

A(n) __________-controlled loop causes a statement or set of statements to repeat as long as the condition is true.

Answer 31

condition

Question 32

The while loop is known as a(n) __________ loop because it tests the condition before performing an iteration.

Answer 32

pretest

Question 33

A(n) ___________ loop usually occurs when the programmer does not include code inside the loop that makes the test condition false.

Answer 33

infinite

Question 34

In Python, you would use the __________ statement to write a count-controlled loop.

Answer 34

for

Question 35

A(n) __________ total is a sum of numbers that accumulates with each iteration of the loop.

Answer 35

running

Question 36

A(n) __________ is a special value that marks the end of a sequence of items.

Answer 36

sentinel

Question 37

The acronym __________ refers to the fact that the computer cannot tell the difference between good data and bad data.

Answer 37

GIGO

Question 38

A(n) __________ validation loop is sometimes called an error trap or an error handler.

Answer 38

input

Question 39

The ___________ function is a built-in function that generates a list of integer values.

Answer 39

range