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'First Forward Into Logo 8: More about Variables' printed from http://nrich.maths.org/

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First Forward Into Logo
Previous: FF7


You might like to learn some more Logo by going to Muggles, Logo and Gradients where you will use Logo to throw light on a very puzzling problem called Muggles Magic .

Consider the following procedure:
TO PATTERN :SIZE
REPEAT 5 [FORWARD :SIZE RT 144]
END


What is different about this procedure?

Did you notice :SIZE ?

It is called a VARIABLE .

It is always written in a particular way using a colon.

What do you think this is about?

What does the word variable suggest to you?

Why not type in the procedure above and then copy the following:
PATTERN 30
PATTERN 60
PATTERN 120
PATTERN

Or experiment with different numbers for yourself and see what patterns you can produce.

Are you feeling happier with the idea of a variable? If so why not explore further this idea of using a variable in those procedures you have met previously.
TO SQUARE :SIZE
REPEAT 4 [ FD :SIZE RT 90]
END

TO HEXAGON :S
REPEAT 6 [ FD :S RT 60]
END

TO DODECA :S
REPEAT 12 [BK :S LT 30]
END

 

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