Classes, Example

A rational number class
- Store numbers as ratios, (or fractions)
- Exercise 3, page 659
- Properties:
  - Domain
    - A ratio of two signed integers
    - Limited by the representation of integers
  - Operations
    - Constructors
      - Initialize to 0
      - Initialize to a given value
    - Observers
      - Output
      - Numerator
      - Denominator
      - Value (return the floating point equivelent)
      - Compare
      - Add
      - Subtract
      - Multiply
      - Divide
    - Transformers
      - Read
      - Reduce
    - Iterators
      - None
Some files to start from