Lab 2a - If

Preparation

Download the zip file for this lab, located above. This zip file has worlds that you will use for Bit. Extract the files and put them in your cs110 directory in a folder called lab2a.

Exercise 1

Bit starts in this world:

7 by 3 world with bit in the bottom left, a blue square directly in front of it, then a red square in the 5th column from the left, with two green squares on top

(a) Can you figure out what this code does?

On a piece of scratch paper, draw out what you think the final world will look like.

from byubit import Bit


def turn_or_change(bit):
    if bit.is_on_red():
        bit.turn_left()
    elif bit.is_on_green():
        bit.paint('blue')
    elif bit.is_on_blue():
        bit.paint('green')


@Bit.worlds('exercise1')
def go(bit):
    while bit.can_move_front():
        bit.move()
        turn_or_change(bit)


if __name__ == '__main__':
    go(Bit.new_bit)

(b) Run the code

Inside of lab2a, run the file called exercise1.py and check your answer.

Exercise 2

Bit starts in this world:

a large world with some red, green, and blue squares scattered throughout

(a) Can you figure out what this code does?

On a piece of scratch paper, draw out where you think Bit will end up. Show which square and which direction Bit will face.

from byubit import Bit


def follow_rules(bit):
    if bit.is_on_blue():
        bit.turn_left()
    elif bit.is_on_green():
        bit.turn_right()
    elif bit.is_on_red():
        bit.turn_right()
        bit.turn_right()


@Bit.worlds('exercise2')
def go(bit):
    while bit.can_move_front():
        bit.move()
        follow_rules(bit)


if __name__ == '__main__':
    go(Bit.new_bit)

(b) Run the code

Inside of lab2a, run the file called exercise2.py and check your answer.

Fix reds

For this problem, Bit starts in this world:

a world with some red squares and a green square, all in the middle row, 2 red squares before the green and 3 after

Bit needs to move to the green square, and then turn all the red squares to blue:

the 3 red squares after the green square are turned to blue

(1) Draw the problem out. Use a drawing or a flow chart.

(2) Write the code. Use decomposition — break the problem up into multiple functions, each one doing a small thing.

Flowers

For this problem, Bit wants to grow some flowers. Bit starts in this world:

a world with 3 green squares in the same row as bit, spaced apart by at least 1 empty square

Each of the green squares represents a flower stem. Move Bit to each flower stem and grow a flower on top of it:

each green square has a red square directly above it, with bit on the right side

(1) Draw the problem out. Use a drawing or a flow chart.

(2) Write the code. Use decomposition — break the problem up into multiple functions, each one doing a small thing.

Grading

To finish this lab and receive a grade, upload a screenshot of your code to Canvas. See Lab 2a in Canvas for additional instructions.

We are providing a solution so you can check your work. Please look at this after you complete the assignment. 😊