codehs: Unit 2 Lessons 13 to 19

Why are parameters useful?

• They allow us to tailor functions to be used in multiple situations

• They allow us to change the order of commands in a function

• They give us the ability to use variables in loops

• They allow the user to give input

How many parameters can we use in each function?

• 1

• 2

• 4

• As many as we need

What is the best way to write a program that uses parameters to draw a square with sides that are 50 pixels long?

• def make_square(length):

  for i in range(4):

  forward(length)

  left(90)

  
  

  make_square(50)

• def make_square(length):

  for i in range(4):

  forward(50)

  left(90)

  
  

  make_square(50)

• def make_square(50):

  for i in range(4):

  forward(50)

  left(90)

  
  

  make_square(50)

• def make_square(length):

  for i in range(4):

  forward(length)

  left(90)

  
  

  make_square(length)

What is the default starting value of i in a for loop?

• 0

• 1

• 2

• 10

What will the values of i be at each iteration of the loop below?

1. for i in range(3):

• 1, 2, 3

• 0, 1, 2, 3

• 0, 1, 2

• 2, 3

What will happen when the value of i reaches 5 in the loop below?

for i in range(5):

left(i)

right(90)

• Tracy will turn 5 degrees to the right

• Tracy will turn 5 degrees to the left

• Tracy will turn 90 degrees to the right

• Tracy will turn 90 degrees to the left

Why do we use if statements?

• To tell Tracy to stop our code if there’s an error

• To have Tracy make decisions based on conditional statements

• To tell Tracy to do something if we run our code

• To have Tracy complete one function at a time

If we write an if statement and the condition is false, what does Tracy do?

• The code stops running

• Tracy gives us an error

• Tracy completes the indented code

• Tracy skips the commands under the if statement

How would we write an if statement where Tracy will put the pen down if a variable called count was positive?

• if count >= 0:

  pendown()

• if count > 0():

  pendown()

• if count > 0:

  pendown()

• if count < 0:

  pendown()

Which comparison operator means ‘is not equal to’?

• ==

• =

• !=

• ?