Help me to solve this C++ problem

[titi]

Question

The road and traffic authority for a small country currently uses a
system to store information about all 'currently' licensed drivers.

A licensed driver has the following info stored about them in a
record;
1. Given name(s) of the license holder.(not more than 128 char (may
have spaces)).
2. Surname of the license holder.(Not more then 128 same like above).
3. Driver license number.
4. The sex of the license holder.
5. The residental address of the license holder.(Not more then
128)same.
6. The registration number of the car the license holder drivers.(A
combination of char and numbers. The string must be six long.)

The current system allow users to add new license holders, modify
details about prexisting license holders and remove a license holder
by entering the license number.

Your job is to write a C++ program to replace the pre-existing system.
In doing so your program must;

1.Allow user to add new license holders to the system.
2.Allow user to remove the license holder from the system.
3. Allow the users to search on a license number, display and
potentially modify a matched record.

The program is an interactive and menu driven. A user can choose from
a set of options to perform a particular action. It also to has
persistent storage.Each license holder has one record in the system.
Records a fixed lenght, therefore the C++ type string cannot be used
in the implementation. The first time the program is run, there is no
data file in the file system. The file is a randoom access file used
to store a collection of records about liccense holders. The name of
this file is data.dat.

If the file already exists when the program starts, you are to read
the all records from the file, into array of records. You can assume
the maximum size of the array is 500. That is at any given time, your
system can hold a maximum of 500 license holders.

During runtime a user may add new license records.When a user adds a
new record, the program prompt the user to enter all details relevent
to the record. The record is inserted into the first available slot in
the array of records and written to the file immediately at the
correseponding record location. If there are no available records an
error is to be printed.

When a user removes a record, all elements of the record are cleared
and the record is marked as available. The corresponding record in the
file is then marked available.

Users can search/dispaly/modify a record. The search key is the
license number. If there is a record with the license number matching
the specified key, the record is displayed and the user given the
option of modifying the record. A user can search for a record and
display it without performing any modifications.

Your program should perform the appropriate checks to ensure valid
input at ALL time.

[Claudio Puviani]

"osmium" <r1********@com cast.net> wrote

If the instructor had meant the use of an index, the following would not
have made any sense:

When a user removes a record, all elements of the record are cleared
and the record is marked as available. The corresponding record in the
file is then marked available.

If he was talking about an indexed file he would simply have said "Remove
the entry from the index". This paragraph makes his intent crystal clear,
regardless of the fact that he may have used an imperfectly chosen word
here or there. The elements are munged to provide
privacy/security/whatever.

Marking records as available is an ancient, if inefficient, technique and can
perfectly coexist with the use of index files. The index files and record files
are often managed separately, with the latter using free lists, markers (less
efficient) or other allocation mechanism. Whether the record is cleared or not
is, again, completely independent of how you deallocate the block.

If you don't have books on the subject, I suggest you have a look at Faircom's
on-line documentation: http://www.faircom.com/support/mans.shtml#ctpman, but
please stop making incorrect blanket statements. There's no shame in not knowing
something, but you look extremely bad when you impart incorrect information on
people who are trying to learn.

Claudio Puviani