Flow Control

Question 1

What do smart programs use to make decisions on whether to run lines of code or skip them?

Answer 1

Booleans

Question 2

What does an if statement do?

Answer 2

If statements are lines of code that respond to different situations.

Question 3

What are the values that decide whether a code block runs or not?

Answer 3

Conditions

Question 4

How can we distinguish code blocks?

Answer 4

Code blocks will have an indentation of two spaces. Lines with the same indentation belong to the same code block.

Question 5

What do we call the code that is indented after an if statement?

Answer 5

A code block

Question 6

What is the maximum number of lines that a code block can have?

Answer 6

As many as we want

Question 7

Why do we use comparisons with if statements?

Answer 7

To make smarter decisions about running or skipping code

Question 8

What do we use comparisons with == for in an if statement?

Answer 8

To run or skip coe depending on whether two values are the same

Question 9

What operator runs an if statement’s code block when two values are different?

Answer 9

!= The inequality operator

Question 10

How can we avoid rewriting the same comparison multiple times?

Answer 10

We can save its result in a variable and reuse the variable.

Question 11

What’s the keyword that decides if a code block should run or not?

Answer 11

if

Question 12

What kind of value do we use as a condition for an if statement?

Answer 12

Boolean

Question 13

What do we call statements that run or skip code depending on a condition being True or False?

Answer 13

Conditional statements

Question 14

Why are comparisons better conditions than just True or False?

Answer 14

Because the value of the variables can change, so it may run or skip a code block depending on the value.

Question 15

Where is an else statement positioned?

Answer 15

The else statement of an if/else statement always goes at the end.

Question 16

Does an else statement need a condition?

Answer 16

No. The else statement doesn’t need its own condition. That’s because it handles the cases where the if’s condition is False.

Question 17

What is an else statement?

Answer 17

A conditional that runs when the if statements condition is False.

Question 18

Why can we consider the else statement a default response?

Answer 18

The else statement’s code block runs for all the cases for which if statement returns False.

Question 19

What does elif stand for?

Answer 19

Else-if

Question 20

What is the function elif used?

Answer 20

elif is used when there is a second condition to be checked when the condition of the if block was not met.

Question 21

Where does the elif statement go?

Answer 21

After the if statement and before the else statement.

Question 22

What happens when the if statement and elif statement conditions return False

Answer 22

The else statement code block runs

Question 23

What operators allows us to program an if statement with multiple conditions?

Answer 23

The and and or operators.

Question 24

What is the and operator for?

Answer 24

For linking multiple conditions.

Question 25

When does the and operator skip the code block?

Answer 25

When one or more conditions are false

Question 26

What is the difference between the and and or operators?

Answer 26

And runs code if all conditions are met. Or runs code if one of the conditions are met.

Question 27

When does the or operator skip the code block?

Answer 27

Only when all linked conditions are False

Question 28

Why doesn’t the else statement have its own condition?

Answer 28

Because its condition is the opposite of the if statement’s condition.

Question 29

Which operator do we use when we want to run code only when all conditions are True?

Answer 29

And

Question 30

What is self-assignment?

Answer 30

It is when we set a variable to its own value.

Question 31

What do self-assigning variables allow us to do?

Answer 31

They allow us to track data that changes over time.

Question 32

What operator do we use to subtract a number from a variable’s value?

Answer 32

-=

Question 33

Which operator adds to a variable’s value?

Answer 33

+=

Question 34

How does a while loop function?

Answer 34

A while loop repeats its code block while its condition is True.

Question 35

How do we know when a while loop will stop?

Answer 35

By checking its condition.

Question 36

What do we call a loop that repeats itself forever?

Answer 36

An infinite loop

Question 37

What controls how many times a while loop repeats itself?

Answer 37

The counter variable. This is a variable set to a number.

Question 38

What’s the name of the variable that we use to count the number of times a loop repeats itself?

Answer 38

A counter variable