Sorry but this is not the spirit of recursion ;-)by Lisztfr (no login)
Is recursion only the fact of calling one's self ? no... In that case it can be replaced by a loop.
I tried something like this before posting my code, like here : the counter was put inside the sub. This didn't make any sens.
My code here is a level beyond that :-) :
1) the counter is put inside the set of variables called by the sub (n)
2) the sub calls itself twice.
In fact circles are draw in 2 ^ n times. The recursion is true, it's not a loop... each time we have x 2 more circles. This is exponential calling.
If a function is calling it self, it also like f(n - 1).
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|*Read about the Ackermann function||on Oct 1|