Y5 Debugging in LOGO

LOGO bug challenges

1. Go to My files – Shared files – st-marks-wilts-sch-ujk – LOGO debugging
2. Open logo bug challenge 1 – correct the code – you should get a spiral and a message when you press play
3. Repeat with logo bug challenges 2 and 3

Squares

• Go to j2code – LOGO – level 3
• Type this:

reset
setpensize 5

• Type the following to draw a square.

repeat 4 [fd 50 rt 90]

• Can you explain why this draws a square?
• Change the code so that the suqare is:
  • twice as big
  • half the size
  • has only three sides drawn, like this 

Using variables

• After setpensize 5, add a line (using return key)
• Type this:

make “length 50

• Now change your square code, swapping the fd number for :length

repeat 4 [fd :length rt 90]

• Try changing the number in the make “length line of code
• Now make you whole code look like this:

reset
setpensize 5
make “length 50
repeat 10
[
repeat 4 [fd :length rt 90]
make “length :length + 10
]

• Can you explain it?
• Play with it – try changing some numbers to make more squares, smaller differences
• Challenge – can you make it do this just by changing the length starting number and how much it changes?
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