Doing Things Over (and Over)

In the Last Lesson

We learned how to start RLogo and how to make the turtle draw shapes on the screen.

• Go to the internet applications and start Netscape Communicator.
• Go to this URL http://www.coho.org/~pete/rlogo

In this lesson

Remember how we could make a triangle or a square? We had to click (or type) the same commands over and over? Now we will learn about the repeat command. Try drawing a square like this...

repeat 4 [ fd 40 left 90 ]

Isn't that a lot faster?

Use repeat commands to draw a polygon with 7, 10, and 24 sides. Here are some things to think about...

• How do you figure out how many degrees to turn?
• To ask the computer to divide, you use the / symbol.
• What happens with figures with more sides?
• Can you fix that?
• What happens if you repeat inside a repeat?

Questions

Just raise your hand and I will help.

Did you know?

You can use repeat statements to draw flowers or stars!

-- PeteJohnson^? - 13 Oct 2005