Question

if the following code was run, how far would tracy move?
1 length = 25
2 length = length*2
3
4 if length != 50:
5 forward(length)
6
7 forward(100)

0 pixels
25 pixels
50 pixels
100 pixels

question: 3
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

Explanation:

Step1: Calculate length value

Given length = 25 initially, then length = length2, so length = 252=50.

Step2: Evaluate if - condition

The if condition is if length != 50:. Since length = 50, the condition is False, so the code block inside the if statement (i.e., forward(length)) will not be executed.

Step3: Determine total movement

The code forward(100) is outside the if - block and will be executed. So Tracy moves 100 pixels.

For the second question:

if statements are used for conditional execution. They allow a program (in this case, commands for Tracy) to make decisions based on whether a certain condition is True or False.

Answer:

For the first question: 100 pixels
For the second question: To have Tracy make decisions based on conditional statements