Program Overview

          This program is used to validate a text file that contains a series of variable length transaction records. The validation process is different for each type of transaction, only the following types of transaction are acceptable and deemed valid -

          All invalid transactions are reported on the printer under suitable headings, with an appropriate error code. All error codes are defined on the last page of the printout. All valid transactions are written to the disk file named 494792VF.DAT for further processing by the Sorting program (in text format). This is unless the user changes this default file name by entering additional program parameters at the command line.

          The text file which contains the transaction records must be named 494792TD.DAT, and be located in the same directory from where the validation program is located and executed from. This is unless the user changes this default file name by entering additional program parameters at the command line. Below describes how the default file names may be overridden: -

          494792P1.exe <transaction file> <validated file> <printer>

The default file names are as follows: -

          Transaction file        – 494792TD.DAT
          Validation file           - 494792VF.DAT
          Printer                    - PRN

          If the user wishes to override one of these files they must also enter the file names of all the files preceding it. For example to override the printer to a text file named test.txt, they must enter the following command: -

         494792P1.exe 494792TD.DAT 494792VF.DAT test.txt

          However if the user only wishes to change the name of the file which contains the transactions to validate, they may enter the following command: -

         494792P1.exe TRANS.DAT

Valid Transaction Types

A valid Issue transaction must be comprised of the following -

• Record Type – Must be ‘I’
• Customer Code – Must be 4 Digits, with an alphanumeric Modulus 11 check digit (weighting factor of 5432) appended to it (i.e. 10006)
• Part Number - Must be 5 Digits, with an alphanumeric Modulus 11 check digit (weighting factor of 65432) appended to it (i.e. 010006)
• Issue Quantity – A numeric value

A valid Receipt transaction must be comprised of the following -

• Record Type – Must be ‘R’
• Customer Code – Must be 4 Digits, with an alphanumeric Modulus 11 check digit (weighting factor of 5432) appended to it (i.e. 10006)
• Part Number - Must be 5 Digits, with an alphanumeric Modulus 11 check digit (weighting factor of 65432) appended to it (i.e. 010006)
• Receipt Quantity – A numeric value

A valid Deletion transaction must be comprised of the following -

• Record Type – Must be ‘D’
• Customer Code – Must be 4 Digits, with an alphanumeric Modulus 11 check digit (weighting factor of 5432) appended to it (i.e. 10006).

A valid Creation transaction must be comprised of the following -

• Record Type – Must be ‘C’
• Customer Code – Must be 4 Digits, with an alphanumeric Modulus 11 check digit (weighting factor of 5432) appended to it (i.e. 10006)
• Customer Name – Maximum of 20 characters in length, and NOT BLANK
• Customer Address – 4 address parts each separated by a ‘;’, maximum of 60 characters
• Customer Balance – 9 numeric characters, which represent the following format 9(7)v99
• Credit limit – 7 numeric characters, which represent the following format 9(7)

The following errors are detected and handled by the validation program: -

      Unknown transaction type, only ‘I’, ‘R’, ‘C’ and ‘D’ transactions are allowable.
      Non numeric customer code, only the check digit may be alphanumeric.
      Incorrect customer code check digit, not modulus 11 of customer code.
      Non numeric part number, only the check digit may be alphanumeric.
      Incorrect part number check digit, not modulus 11 of part number.
      Non numeric quantity.
      Customer address incorrect format.
      Non numeric customer balance.
      Non numeric credit limit.
      Customer name missing, there must be an address entered.
      Missing part number.
      Customers address missing, there must be a name entered.
      There was too much information given for the type of transaction.

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