172 lines
5.5 KiB
COBOL
172 lines
5.5 KiB
COBOL
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IDENTIFICATION DIVISION.
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PROGRAM-ID. TTT.
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* REMARKS. prove tic-tac-toe is not winnable against a good foe.
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* REMARKS. DOES NOT RUN WITH MS COBOL v1 or v2 due to recursive PERFORM
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ENVIRONMENT DIVISION.
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CONFIGURATION SECTION.
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DATA DIVISION.
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WORKING-STORAGE SECTION.
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01 BOARD.
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05 B PIC 9(04) COMP OCCURS 9 TIMES.
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05 VALST PIC 9(04) COMP OCCURS 10 TIMES.
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05 ALPHAST PIC 9(04) COMP OCCURS 10 TIMES.
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05 BETAST PIC 9(04) COMP OCCURS 10 TIMES.
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05 XST PIC 9(04) COMP OCCURS 10 TIMES.
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05 PMST PIC 9(04) COMP OCCURS 10 TIMES.
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01 MOVECOUNT PIC 9(04) COMP VALUE 0.
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01 DEPTH PIC 9(04) COMP VALUE 0.
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01 NUM-DISP PIC 9999.
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01 ITER PIC 9(04) COMP VALUE 0.
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01 WI PIC 9(04) COMP VALUE 0.
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01 VAL PIC 9(04) COMP VALUE 0.
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01 T PIC 9(04) COMP VALUE 0.
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01 D PIC 9(04) COMP VALUE 0.
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01 M PIC 9(04) COMP VALUE 0.
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01 X PIC 9(04) COMP VALUE 0.
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01 PM PIC 9(04) COMP VALUE 0.
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01 SC PIC 9(04) COMP VALUE 0.
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01 Z PIC 9(04) COMP VALUE 0.
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01 ALPHA PIC 9(04) COMP VALUE 0.
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01 BETA PIC 9(04) COMP VALUE 0.
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01 FIRSTMOVE PIC 9(04) COMP VALUE 0.
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PROCEDURE DIVISION.
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MAIN.
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DISPLAY 'hello from cobol'.
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MOVE 1 TO ITER.
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INITBOARD.
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MOVE 0 TO B( ITER ).
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ADD 1 TO ITER.
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IF ITER < 10 GO TO INITBOARD.
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MOVE 0 TO ITER.
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NEXTITER.
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MOVE 0 TO MOVECOUNT.
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MOVE 1 TO FIRSTMOVE.
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PERFORM RUNMM.
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MOVE 2 TO FIRSTMOVE.
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PERFORM RUNMM.
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MOVE 5 TO FIRSTMOVE.
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PERFORM RUNMM.
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ADD 1 TO ITER.
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IF ITER < 1 GO TO NEXTITER.
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DISPLAY 'final move count and winner: '.
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MOVE MOVECOUNT TO NUM-DISP.
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DISPLAY NUM-DISP.
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MOVE SC TO NUM-DISP.
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DISPLAY NUM-DISP.
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STOP RUN.
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RUNMM.
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MOVE 1 TO B( FIRSTMOVE ).
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MOVE FIRSTMOVE TO X
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MOVE 2 TO ALPHA
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MOVE 9 TO BETA
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PERFORM MINMAX.
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MOVE 0 TO B( FIRSTMOVE ).
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WINNER.
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MOVE 0 TO WI.
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MOVE B( 1 ) TO T.
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IF 0 NOT = T AND T=B(2) AND T=B(3) MOVE T TO WI
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ELSE IF 0 NOT= T AND T=B(4) AND T=B(7) MOVE T TO WI.
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IF 0 = WI
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MOVE B(2) TO T
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IF 0 NOT= T AND T=B(5) AND T=B(8) MOVE T TO WI
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ELSE
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MOVE B(3) TO T
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IF 0 NOT= T AND T=B(6) AND T=B(9) MOVE T TO WI
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ELSE
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MOVE B(4) TO T
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IF 0 NOT= T AND T=B(5) AND T=B(6) MOVE T TO WI
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ELSE
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MOVE B(7) TO T
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IF 0 NOT= T AND T=B(8) AND T=B(9) MOVE T TO WI
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ELSE
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MOVE B(5) TO T
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IF 0 NOT= T AND T=B(1) AND T=B(9) MOVE T TO WI
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ELSE
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IF 0 NOT= T AND T=B(3) AND T=B(7) MOVE T TO WI.
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SHOWPOS.
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MOVE B(Z) TO NUM-DISP.
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DISPLAY NUM-DISP.
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SHOWBOARD.
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DISPLAY 'board: '.
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PERFORM SHOWPOS VARYING Z FROM 1 BY 1 UNTIL Z>9.
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INITVALPM.
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DIVIDE DEPTH BY 2 GIVING D.
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MULTIPLY D BY 2 GIVING M.
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IF DEPTH NOT = M
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MOVE 2 TO VAL
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MOVE 1 TO PM
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ELSE
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MOVE 9 TO VAL
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MOVE 2 TO PM.
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MINMAX.
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DISPLAY 'minmax'
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ADD 1 TO MOVECOUNT.
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MOVE 0 TO VAL.
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IF DEPTH > 3
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PERFORM WINNER
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IF WI NOT = 0
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IF WI = 1 MOVE 6 TO VAL ELSE MOVE 4 TO VAL
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ELSE IF DEPTH = 8 MOVE 5 TO VAL.
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IF 0 = VAL
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PERFORM INITVALPM
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ADD 1 TO DEPTH
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PERFORM MAKEMOVE VARYING X FROM 1 BY 1 UNTIL (X>9)
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SUBTRACT 1 FROM DEPTH.
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MOVE VAL TO SC.
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UPDATEODD.
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IF SC = 6 MOVE 10 TO X.
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IF SC > VAL MOVE SC TO VAL.
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IF VAL NOT < BETA MOVE 10 TO X.
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IF VAL > ALPHA MOVE VAL TO ALPHA.
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UPDATEEVEN.
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IF SC = 4 MOVE 10 TO X.
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IF SC < VAL MOVE SC TO VAL.
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IF VAL NOT > ALPHA MOVE 10 TO X.
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IF VAL < BETA MOVE VAL TO BETA.
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UPDATESTATE.
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IF PM = 1 PERFORM UPDATEODD
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ELSE PERFORM UPDATEEVEN.
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MAKEMOVE.
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IF B( X ) = 0
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MOVE PM TO B( X )
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MOVE VAL TO VALST( DEPTH )
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MOVE X TO XST( DEPTH )
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MOVE PM TO PMST( DEPTH )
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MOVE ALPHA TO ALPHAST( DEPTH )
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MOVE BETA TO BETAST( DEPTH )
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DISPLAY 'recursing to minmax'
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PERFORM MINMAX
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MOVE BETAST( DEPTH ) TO BETA
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MOVE ALPHAST( DEPTH ) TO ALPHA
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MOVE PMST( DEPTH ) TO PM
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MOVE XST( DEPTH ) TO X
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MOVE VALST( DEPTH ) TO VAL
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MOVE 0 TO B( X )
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PERFORM UPDATESTATE.
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