Chapter 9

Level: Medium

LOGO programming often uses a technic called recursion. In this chapter, first, we’ll explore recursion with some simple examples. Then, we’ll go further with the drawing of a fractal curve called the Van Koch snowflake“. First of all:

A procedure is recursive if it calls itself.

 9.1 With drawing area.
  9.1.1 First example:
  9.1.2 Second example:
 9.2 With the text zone
  9.2.1 First example:
  9.2.2 Breakout test
 9.3 A fractal example: Van Koch snowflake
 9.4 Recursion with words
 9.5 Calculate a factorial
 9.6 π Approximation