HOMEWORK PROBLEM 2_5         INTRODUCTION TO Ada II   586.2

PURPOSE:      To learn about records with discriminants and variants.
              The record type definition is relatively easy to master.
              The discriminant(s) are syntactically and semantically
              like the formal parameters of a procedure. The variant
              part is like a case statement where the executable
              statements are replaced by declarations. The complicated
              part of discriminants is the myriad of restrictions when
              creating and initializing objects of these record types.
              
END RESULT:   A package that allows the attached procedure to
              compile and execute correctly.

PROBLEM:      Consider a simplified problem of operating on geometric
              shapes for the purpose of producing drawings. Each shape
              has unique storage and processing requirements. Many
              operations on the shapes have common forms yet the detailed
              computations vary greatly.
              You are to provide a package to manipulate some simple
              geometries. The outline of several candidate packages
              is attached. You are to handle at least circles, triangles
              and rectangles. Your package must be able to draw the shapes
              at specified coordinates, expand the shapes and produce
              crude plotted output.

              In order to save typing, the full set of sample packages
              used in the lecture can be copied from PUSERS:[ADA.ADACLASS]
              These do not have to be used. You can solve the problem by
              any method you choose.

TURN IN:      Printout of compilation , the  .LIS files ( with no errors!)
              in the order compiled. Printout of execution.

OBSERVE:      Aggregates used to initialize records with discriminants
              must contain the discriminant value(s).

METHOD:       Read either Barnes or the MIL-STD then build up the solution
              Incrementally. Just dumping in a bunch of code may cause
              so many diagnostics that the problem may never get solved.

READING:      BARNES  11.1 , 11.2
              ANSI/MIL-STD-1815A 3.7