You are registering people for a campus club that charges dues. New members receive a discount, and returning members pay the full fee. You have a file that contains the ID numbers (which are integers) of existing members, and a file containing the ID numbers for people who have signed up for this year. Write an application that determines which of the people who have signed up for this year are new members and which are returning members. The application should combine the two files so that there are no duplicates and write the result out as a new file of existing members. It should also write out three additional files: the first contains the ID numbers of past members who did not return, the second contains the ID numbers of returning members, and the third contains the ID numbers of new members.
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