Fraction provides methods for dealing with fractions like 1/3 as fractions (not as 0.33333...). All public arithmetic operations answer reduced fractions (see examples).
instance variables: 'numerator denominator '
Examples: (note the parentheses required to get the right answers in Smalltalk and Squeak):
(2/3) + (2/3)
(2/3) + (1/2) "answers shows the reduced fraction"
(2/3) raisedToInteger: 5 "fractions also can have exponents"
