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Ingy döt Net 2026-02-01 16:33:20 -08:00
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Task/ISBN13-check-digit/COBOL/isbn13-check-digit.cobol
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******************************************************************
* Author: Jay Moseley
* Date: November 10, 2019
* Purpose: Testing various subprograms/ functions.
* Tectonics: cobc -xj testSubs.cbl
******************************************************************
IDENTIFICATION DIVISION.
PROGRAM-ID. testSubs.
ENVIRONMENT DIVISION.
CONFIGURATION SECTION.
REPOSITORY.
FUNCTION ALL INTRINSIC
FUNCTION validISBN13.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
DATA DIVISION.
FILE SECTION.
WORKING-STORAGE SECTION.
01 IX PIC S9(4) COMP.
01 TEST-ISBNS.
02 FILLER PIC X(14) VALUE '978-0596528126'.
02 FILLER PIC X(14) VALUE '978-0596528120'.
02 FILLER PIC X(14) VALUE '978-1788399081'.
02 FILLER PIC X(14) VALUE '978-1788399083'.
01 TEST-ISBN REDEFINES TEST-ISBNS
OCCURS 4 TIMES
PIC X(14).
PROCEDURE DIVISION.
MAIN-PROCEDURE.
PERFORM
VARYING IX
FROM 1
BY 1
UNTIL IX > 4
DISPLAY TEST-ISBN (IX) ' ' WITH NO ADVANCING
END-DISPLAY
IF validISBN13(TEST-ISBN (IX)) = -1
DISPLAY '(bad)'
ELSE
DISPLAY '(good)'
END-IF
END-PERFORM.
GOBACK.
END PROGRAM testSubs.
******************************************************************
* Author: Jay Moseley
* Date: May 19, 2016
* Purpose: validate ISBN-13 (International Standard
* Book Number).
******************************************************************
IDENTIFICATION DIVISION.
FUNCTION-ID. validISBN13.
ENVIRONMENT DIVISION.
CONFIGURATION SECTION.
REPOSITORY.
FUNCTION ALL INTRINSIC.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
DATA DIVISION.
FILE SECTION.
WORKING-STORAGE SECTION.
01 PASSED-SIZE PIC S9(6) COMP-5.
01 IX PIC S9(4) COMP.
01 WORK-FIELDS.
02 WF-DIGIT PIC X.
02 WF-COUNT PIC 9(2).
88 WEIGHT-1 VALUE 1, 3, 5, 7, 9, 11, 13.
88 WEIGHT-3 VALUE 2, 4, 6, 8, 10, 12.
02 WF-SUM PIC S9(8) COMP.
LINKAGE SECTION.
01 PASSED-ISBN PIC X ANY LENGTH.
01 RETURN-VALUE PIC S9.
PROCEDURE DIVISION USING PASSED-ISBN
RETURNING RETURN-VALUE.
CALL 'C$PARAMSIZE'
USING 1
GIVING PASSED-SIZE
END-CALL.
COMPUTE-CKDIGIT.
INITIALIZE WORK-FIELDS.
PERFORM
VARYING IX
FROM 1
BY 1
UNTIL IX GREATER THAN PASSED-SIZE
MOVE PASSED-ISBN (IX:1) TO WF-DIGIT
IF WF-DIGIT IS NUMERIC
ADD 1 TO WF-COUNT
IF WEIGHT-1
ADD NUMVAL(WF-DIGIT) TO WF-SUM
ELSE
COMPUTE WF-SUM = WF-SUM +
(NUMVAL(WF-DIGIT) * 3)
END-COMPUTE
END-IF
END-IF
END-PERFORM.
IF MOD(WF-SUM, 10) = 0
MOVE +0 TO RETURN-VALUE
ELSE
MOVE -1 TO RETURN-VALUE
END-IF.
GOBACK.
* - - - - - - - - - - - - - - - - - - - - - - PROGRAM EXIT POINT
END FUNCTION validISBN13.