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Langton's ant: Difference between revisions
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=={{header|BBC BASIC}}==
<lang BBC BASIC>
REM Implementation of Langton's ant for Rosetta Code
fieldsize%=100
REM Being pedantic, this will actually result in a field of 101 square,
REM since arrays start at 0, and my implementation allows them to use it
DIM field&(fieldsize%,fieldsize%) : REM variables with an & suffix are byte variables
x%=fieldsize%/2
y%=fieldsize%/2
d%=0
REPEAT
IF field&(x%,y%)=0 THEN field&(x%,y%)=1:d%-=1 ELSE field&(x%,y%)=0:d%+=1
GCOL 15*field&(x%,y%)
PLOT 69,x%*2,y%*2 :REM for historical reasons there are two "plot points" per pixel
d%=(d%+4) MOD 4 :REM ensure direction is always between 0 and 3
CASE d% OF
WHEN 0:y%+=1
WHEN 1:x%+=1
WHEN 2:y%-=1
WHEN 3:x%-=1
ENDCASE
UNTIL x%>fieldsize% OR x%<0 OR y%>fieldsize% OR y%<0
END
</lang>
=={{header|C}}==
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