Author: dominicbeesley
Category: Christmas Challenge
System: BBC
Language: BASIC
Len source code: 53
Len exe file: n/a
Len code only: 53
Instructions:
In B-em or BeebEm load the .ssd file (Disc->Load 0/2) and boot with
shift-break (shift-F12) or type
CHAIN"PROGRAM"
at the BASIC > pompt
Description:
Draw a character at each position in the 19x19 grid
at each character if (C+L) MOD 6 = 0 OR (C-L) MOD 6 = 0 then draw
a star. One term C+L draws a set of diagonal NW to SE lines the other
NE to SW.
The fact that logical TRUE in BBC BASIC is -1 is used to remove an IF
VDU 32-10*(<logical>) will print a space if FALSE (0) or a * if TRUE -1
The logic above is reduces by using a multiply in place of the OR and
reducing the expression to get rid of a few characters
Comments:
An .ssd containing the program and a !BOOT file have been provided for
convenience but have not been counted in the byte count.
53 in decimal is 35 in hex - this seemed like a good place to stop
optimising!
