THIS HAS BEEN UPDATED. You may ignore the update and go with the original version
if you wish. If you have already submitted there is no need to do anything. It was
just pointed out to me that I was referring to the secret password as a zip code.
That was what I used in a similar assignment last year. You can handle it in which-
ever way works: either just pretend it is indeed a (maybe futuristic) zip code
or call it a password. It doesn't matter which.

The file /home/218/lots_of_people.txt contains lines of data. Each line describes
one person: Social security number, birth date (YYYYMMDD), first name, last name,
and secret password. The lines loo like this:

      346671424 25 04 1953 Simba VonRichthofen iPSD1jpE
      346672433 02 10 1952 Brent Mozart Bup1v6FX
      346673675 08 06 1974 Alexandra Lamprey YNbEg0Lt
      346674451 17 10 1970 Ezra Osmond 8nenexhH
      346675987 07 08 1997 Nancy Dornier JxoKZszB
      346676332 12 02 1974 Arthropod Tumor PTGS4Ifb
      346677449 18 05 1987 Lillian DeMorgan 7vel34Ds
      346678718 25 08 1959 Terence Silverman 0JVurP0u
      346679758 01 04 1999 Ralph Frampton UXsW6mOz
      346680428 29 05 1990 Betty Osborne sVZdggQ6

This is the same file as was used for assignment 4 except that it has been shortened.

You are to write a program that reads this file or any other file with the same
layout, and stores its information in a Binary Tree. The tree should be ordered 
on the person's name - primarily last name, but when two people have the same 
last name, order them by first name.

Make your program accept the name of the database file from the command line
instead of always using /home/218/database.txt, so you might run you program
by typing
          a.out /home/218/lots_of_people.txt

Once your program has constructed the tree, it should enter an interactive loop,
taking commands from the user:

FIND firstname lastname
   - display all information about the named person,
     your program must not crash if no such person exists!

PRINT
   - display all information about everyone in the database.

PASSWORD xyz
   - display the names of all people with the given secret password. There will
     usually only be one, but your program must work for all such data files, so
     it is possible that quite a number of people could have the same password..

OLDEST
   - print the name and sceret password of the oldest person in the database.

SAVE filename
   - save the entire database in the named file. Make sure the format is correct,
     you should be able to run your program again, this time giving it the new
     file name, and it being able to read it correctly. This will of course
     result in the database becoming sorted. If you later run the program again
     and make it re-read the file just created, you will get a very badly
     structured binary tree, and some operations may take longer than expected.

CHANGE firstname lastname newpassword
   - Change the secret password of the named person. Be sure your program survives
     if no such person exists.

EXIT
   - exit from the program.

Make sure your program's output is neat and tidy. No unnecessary prompts.