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                                  EXERCISES


	1.  Create a package specification called COMPLEX which exports a
private type called NUMBER.  Complete the package by describing a body
which includes the  operations of addition, substraction, multiplication,
division, setting and  retrieving values, and determining angle and length.

	2.  Create a package, called METRIC_ENGLISH_CONVERSION, that
exports the types LITER and GALLON, INCH and CENTIMETER, along with
constants with the appropriate universal_real values needed for conversion.

	3.  Write the package specification for a unit that brings in the
current date in month-day-year form and returns an equivalent Julian
date.  (A Julian date includes the year number and the day of the year. 
For example, 128 83 is the 128th day of 1983.)

	4.  Rewrite the factorial routine in TRANSCENDENTAL_FUNCTIONS
without using recursion.

	5.  Write the package specification for three-dimensional
transformations (scale, rotate, translate).

	*6. Rewrite the body of FIFO, this time using access types as the
underlying implementation for the QUEUE.

	*7. Modify the LEXICAL_ANALYZER so that an exception occurs
whenever an invalid character is received.

	*8. Modify the LEXICAL_ANALYZER so that we can recognize
delimiters such as  ".=", "+", and "+".