Unit 5

Question 1

5.2 - Loops (General)

What is a loop?

Answer 1

a programming construct that allows us to repeat lines of code indefinitely

Question 2

5.2 - Loops (General)

What is a loop body?

Answer 2

statements/lines of code executed within the loop

Question 3

5.2 - Loops (General)

When are looping conditions evaluated?

When does the loop decide to repeat itself (based on a condition)?

Answer 3

after every full execution of the loop

Question 4

5.3 - While Loops

What is a while loop?

Answer 4

the loop body executes while a condition is true

Question 5

5.3 - While Loops

What is a sentinel-controlled loop ?

Answer 5

a while loop whose condition depends on a specific string/character value*

also called a sentinel value , which changes as the loop progresses

Question 6

5.3 - While Loops

What is an infinite loop?

Answer 6

a loop with no termination condition

Question 7

5.4 - More While Loop Examples

What is a docstring?

Answer 7

a multi-line comment that describes what the program does prior to execution

Question 8

5.4 - More While Loop Examples

What is a flag-controlled loop?

Answer 8

a loop whose execution is determined by a Boolean value

Question 9

5.4 - More While Loop Examples

What is an EOF-controlled loop?

Answer 9

a loop determined by “end of file” files

Question 10

5.5 - Counting

How do you make a loop repeat a select number of times?

use i as loop variable, repeat 3 times, assume i = 0

Answer 10

while i < 3
i = i + 1 or i += 1

Question 11

5.7 - For Loops

What is a for loop?

Answer 11

a loop where a variable is assigned a value each iteration

used for lists, dictionaries, and tuples

Question 12

5.7 - For Loops

What does reversed() do?

Answer 12

reverses the order which elements are read through

ex. list = [1, 2, 3]
reversed(list) = [3, 2, 1]

Question 13

5.8 - Counting Using the Range Function

What does range() do?

Answer 13

generates a sequence of integers between a starting (inclusive) and ending integer (exclusive)

some ranges feature a third option (integer step value) that changes the rate which numbers are counted
ex. range(0, 11, 2) counts every 2 numbers 0-10

Question 14

Software Development Cycle

What is the Software Development Cycle?

Answer 14

1. identify/state the problem
2. analyze the problem
3. design an algorithm to solve the problem
4. impliment the algorithm via a computer program
5. test/verify the program
6. maintain and update the program