The following programs demonstrate the use of the
    DECLARE_VARIABLE clause to declare a program variable. These
    programs:

    o  Declare the variable, badge, to have the same data type and
       size attributes as EMPLOYEE_ID in the EMPLOYEES relation.

    o  Use this variable for interactive processing. Note that the
       interactive portion of the programs appear before the READY
       statement. This keeps locks on the database to a minimum.

    o  Select the record from the EMPLOYEES relation that has the
       same value for EMPLOYEE_ID as is stored in badge.

    o  Modify the STATUS_CODE field of this record.

    Note that the C program uses the read_string function to prompt
    for and receive a value for badge. For more information on this
    function see Appendix B of the "RDML Reference Manual".