Program to calculate modified mod 10 check digit

This program is stand-alone and can be incorporated in any program when you need to calculate modified mod 10 check digit as per UPS label requirements.
REPORT Z_mod_check_digit.

*This program will calculate the modified mod 10 check digit as per
*UPS label requirements.
PARAMETERS: S_NUMBER(17)  TYPE C DEFAULT '1Z123X56031234820'.

  DATA: WUPS_STR(15) TYPE C,
        SUM_ODD      TYPE I,
        SUM_EVEN     TYPE I,
        SUM_TOTAL    TYPE I,
        STEP         TYPE I,
        W_CHAR(1)    TYPE C,
        W_VAL(1)     TYPE C,
        W_TEMP(1)    TYPE C,
        MODX(2)      TYPE C,
        MOD10(1)     TYPE C.
  CLEAR: SUM_ODD, SUM_EVEN, SUM_TOTAL.
  WUPS_STR = S_NUMBER+2(15).
  STEP = 0.
  WHILE STEP < 15.
    W_CHAR = WUPS_STR+STEP(1).
    PERFORM GET_VALUE USING W_CHAR W_VAL.
    W_TEMP = STEP MOD 2.
    IF ( W_TEMP = 0 ).
      SUM_ODD = SUM_ODD + W_VAL.
    ELSE.
      SUM_EVEN = SUM_EVEN + W_VAL.
    ENDIF.
    STEP = STEP + 1 .
  ENDWHILE.
  SUM_TOTAL = SUM_ODD + 2 * SUM_EVEN.
  MODX = 10 - ( SUM_TOTAL MOD 10 ).
  IF MODX = 10.
    MOD10 = MODX+1(1).
  ELSE.
    MOD10 = MODX+0(1).
  ENDIF.
  SKIP 2.
  WRITE:/20 'The check digit is:  ', MOD10.
  SKIP 1.
*---------------------------------------------------------------------*
*       FORM GET_VALUE                                                *
*---------------------------------------------------------------------*
*      Convert alpha numeric to numeric as per

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 UPS Barcode specs      *
*---------------------------------------------------------------------*
FORM GET_VALUE USING W_CHAR W_VAL.
  CASE W_CHAR.
    WHEN '0' OR 'I' OR 'S'.
      W_VAL = 0.
    WHEN '1' OR 'J' OR 'T'.
      W_VAL = 1.
    WHEN '2' OR 'A' OR 'K' OR 'U'.
      W_VAL = 2.
    WHEN '3' OR 'B' OR 'L' OR 'V'.
      W_VAL = 3.
    WHEN '4' OR 'C' OR 'M' OR 'W'.
      W_VAL = 4.
    WHEN '5' OR 'D' OR 'N' OR 'X'.
      W_VAL = 5.
    WHEN '6' OR 'E' OR 'O' OR 'Y'.
      W_VAL = 6.
    WHEN '7' OR 'F' OR 'P' OR 'Z'.
      W_VAL = 7.
    WHEN '8' OR 'G' OR 'Q'.
      W_VAL = 8.
    WHEN '9' OR 'H' OR 'R'.
      W_VAL = 9.
    WHEN OTHERS.
  ENDCASE.
ENDFORM.                   " get_value

This was first published in March 2002

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