Author: Michael Doornbos (mike@imapenguin.com)
Category: Christmas Challenge
System:   C64
Language: BASIC
Len source code: 194 bytes
Len exe file:  161 bytes (prg minus 2 bytes for header)
Instructions:
Load and run.
Description:
Draws 19x19 snowflake using pure math. Calculates distance
from center and POKEs asterisks where formula conditions
match. Exploits eight-fold symmetry - no stored pattern data.