Deck 4: Repetition Structures

Question 1

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

Answer 1

True

Question 2

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 2

C

Question 3

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 3

D

Question 4

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

Question 5

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

Question 6

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

Question 7

Both of the following for clauses would generate the same number of loop iterations.
for num in range(4):
for num in range(1,5):

Question 8

A variable used to keep a running total is called a(n)

A) accumulator
B) total
C) running total
D) summer

Question 9

__________ 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

Question 10

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.

Question 11

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

Question 12

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

Question 13

Which of the following is not an augmented assignment operator?

A) *=
B) /=
C) +=
D) <=

Question 14

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

Question 15

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

Question 16

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

Question 17

In order to draw an octagon with turtle graphics,you would need a loop that iterates eight times.

Question 18

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

Question 19

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.

Question 20

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.

Question 21

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

Question 22

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

Question 23

What will be displayed after the following code is executed?

A) counting counting counting counting
B) counting
Counting
Counting
Counting
C) counting
Counting
D) counting
Counting
Counting

Question 24

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

Question 25

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

Question 26

What will be displayed after the following code is executed?

Question 27

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

Question 28

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

Question 29

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

Question 30

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

Question 31

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

Question 32

What will be displayed after the following code is executed?

A) 30
B) 25
C) 0 5 10 15 20
D) 5 10 15

Question 33

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

Question 34

What does the following program do?

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.

Question 35

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

Question 36

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

Question 37

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

Question 38

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

Question 39

What will be displayed after the following code is executed?

Question 40

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

Question 41

The following for loop iterates ___________ times to draw a square.
for x in range(4):
turtle.forward(200)
turtle.right(90)