GUI for currency exchange rates. Implement a GUI to allow users to change the
currency exchange rates used in assignment 6. The user should be able to enter
new a new currency. The GUI is being developed for users that are authorized to
modify the exchange rates, so there is no need to provide a level of
authentication or security.
Saving the currency exchange rates. When the exchange rates are changed save
the new rates in a file separate from the image. Of course saving the rates in
a file is not useful if the contents of the file are never used. When money is
changed from one currency to another the file or a cached version of the file
is to be used to compute the exchange in currency.
assignment is worth 27 points. 9 points are for meeting problem 1 requirements.
9 points are for meeting problem 2 requirements. 5 points are for the structure
of your code. 2 points are for following Smalltalk naming conventions and
formatting. 2 points are for unit testing problem 2.