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Data update

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Ingy döt Net 2026-02-01 16:33:20 -08:00
parent 5150844a7d
commit 4bb20c9b71
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91
Task/Langtons-ant/COBOL/langtons-ant.cobol
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IDENTIFICATION DIVISION.
PROGRAM-ID. langtons-ant.
DATA DIVISION.
WORKING-STORAGE SECTION.
78 Grid-Size VALUE 100.
01 grid-area.
03 grid-x OCCURS Grid-Size TIMES.
05 grid-y OCCURS Grid-Size TIMES.
07 cell-colour PIC X VALUE "W".
88 black VALUE "B".
88 white VALUE "W".
01 ant-x PIC 999.
01 ant-y PIC 999.
01 ant-direction PIC 9.
88 upward VALUE 0.
88 rightward VALUE 1.
88 downward VALUE 2.
88 leftward VALUE 3.
78 Pause-Time-Ns VALUE 10000000.
01 display-y PIC 999.
78 Black-Background VALUE 0.
78 White-Background VALUE 7.
01 i PIC 999.
01 j PIC 999.
01 pause PIC X.
PROCEDURE DIVISION.
main-line.
DIVIDE Grid-Size BY 2 GIVING ant-x, ant-y
PERFORM display-initial-grid
PERFORM UNTIL (ant-x = Grid-Size OR 0)
OR (ant-y = Grid-Size OR 0)
PERFORM step-simulation
CALL "CBL_OC_NANOSLEEP" USING Pause-Time-Ns
END-PERFORM
DISPLAY "Press enter to quit." AT LINE 1 COLUMN 1
ACCEPT pause
GOBACK
.
step-simulation.
IF black (ant-x, ant-y)
SET white (ant-x, ant-y) TO TRUE
PERFORM display-ant-cell
COMPUTE ant-direction =
FUNCTION MOD(ant-direction + 1, 4)
ELSE
SET black (ant-x, ant-y) TO TRUE
PERFORM display-ant-cell
COMPUTE ant-direction =
FUNCTION MOD(ant-direction - 1, 4)
END-IF
EVALUATE TRUE
WHEN upward
ADD 1 TO ant-y
WHEN rightward
ADD 1 TO ant-x
WHEN downward
SUBTRACT 1 FROM ant-y
WHEN leftward
SUBTRACT 1 FROM ant-x
END-EVALUATE
.
display-ant-cell.
SUBTRACT ant-y FROM Grid-Size GIVING display-y
IF black (ant-x, ant-y)
DISPLAY SPACE AT LINE display-y COLUMN ant-x
WITH BACKGROUND-COLOR Black-Background
ELSE
DISPLAY SPACE AT LINE display-y COLUMN ant-x
WITH BACKGROUND-COLOR White-Background
END-IF
.
display-initial-grid.
PERFORM VARYING i FROM 1 BY 1 UNTIL i > Grid-Size
AFTER j FROM 1 BY 1 UNTIL j > Grid-Size
DISPLAY SPACE AT LINE i COLUMN j
WITH BACKGROUND-COLOR White-Background
END-PERFORM
.