Answer Posted / ankush chaudhary

Defining data files as externally described has several
advantages over program desribed files:
1. If you design the file using database design principles,
externally defined files can reduce the need for
duplication of data across fiels. This kind of duplication
is called redundancy. Because all programs using a given
file use the same field definition and names. Externally
described files impose standardisation among programs and
across applications.
2. Externally described also also increase programmers
efficiency and reduces errors because programmers don't
need to duplicate the file definition effort each time they
need to reference a file within the a program.
3. If it is necessary to add a field to a fiels records or
to change a fields definition, these changes need to made
in only one place (in the externally described file) rather
than in every program that uses that file. THus simplifying
maintenance.
Hope this much difference is suffient :))

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