Y56 LOGO: procedures –> with variables

This LOGO program uses procedures (like recipes) for each letter then calls them at the very end of the code.

• Computing letter procedures

Open these LOGO files. Can you work out what they do? Can you understand the code?

• c :size
• shape :sides
• shape :sides :size
• rectangle w h x y

Can you make a procedure to draw:

• an arc of any size and angle?
• the first letter of you rname any size and position on the canvas?
  1. new logo page, reset, setpensize 5
  2. code your letter – test it line by line
  3. make it a procedure: to… end
  4. replace fd numbers with :size
  5. compare with the LOGO programs you have looked at to see what else you need to do

Useing any of the procedure above can you make these shapes?