commit 8bedb78899f872f151f2f36dbd97f3194acb64ec · treybastian.com/advent-of-code

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2025/day_01_part2.cbl
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              IDENTIFICATION DIVISION.

     

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              PROGRAM-ID. day_01_part2.

     

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              AUTHOR. Trey Bastian.

     

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              ENVIRONMENT DIVISION.

     

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              INPUT-OUTPUT SECTION.

     

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              FILE-CONTROL.

     

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              SELECT input-file ASSIGN TO "./input.txt"

     

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                  ORGANIZATION IS LINE SEQUENTIAL.

     

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              DATA DIVISION.

     

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              FILE SECTION.

     

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              FD input-file.

     

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              01 input-line.

     

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                02 direction PIC X.

     

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                02 move-text PIC XXX.

     

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              WORKING-STORAGE SECTION.

     

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              01 dial-position PIC 9(2) VALUE 50.

     

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              01 new-position PIC 9(2).

     

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              01 move-num PIC S9(3).

     

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              01 zero-count PIC 9(4) VALUE ZEROS.

     

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              01 eof PIC X.

     

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                  88 eof-y VALUE "Y".

     

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                  88 eof-n VALUE "N".

     

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              PROCEDURE DIVISION.

     

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                OPEN INPUT input-file.

     

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                SET eof-n to TRUE.

     

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                PERFORM UNTIL eof-y

     

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                    READ input-file AT END

     

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                        SET eof-y to TRUE

     

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                    NOT AT END

     

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                      MOVE FUNCTION NUMVAL(move-text) TO move-num

     

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                      IF move-num > 99 

     

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                        COMPUTE zero-count = zero-count + (move-num / 100) 

     

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                      END-IF

     

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                      IF direction = "L"

     

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                       COMPUTE move-num = 0 - move-num 

     

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                      END-IF

     

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                      COMPUTE new-position = FUNCTION MOD(dial-position +

     

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                      move-num, 100) 

     

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                      if new-position < 0

     

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                        ADD 100 to new-position

     

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                      END-IF

     

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                      EVALUATE new-position

     

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                        WHEN 0

     

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                          ADD 1 to zero-count

     

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                         WHEN < dial-position AND direction = "R" AND

     

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                           dial-position <> 0

     

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                           ADD 1 to zero-count

     

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                         WHEN > dial-position AND direction = "L" AND

     

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                           dial-position <> 0

     

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                           ADD 1 to zero-count

     

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                       END-EVALUATE

     

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                      MOVE new-position TO dial-position

     

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                     END-READ

     

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                END-PERFORM.

     

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                CLOSE input-file.

     

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                DISPLAY zero-count.

     

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              STOP-RUN.

     

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