8.1 Examples

To draw a square with side length 100, we write in the editor:

 to square
 repeat 4 [forward 100 right 90]
 end

We just have to modify this procedure by doing:

• We add :c at the end of the definition line. This indicates that the procedure is now waiting for an argument called :c
• We replace the side length 100 by the variable name :c

We obtain

                                                                                                  
                                                                                                  
 to square :c
 repeat 4 [forward :c right 90]
 end

Therefore, if we write: square 100 square 50 square 30 square 20 square 10