Float objects represent inexact real numbers using the native architecture's double-precision floating point representation.

Floating point has a different arithmetic and is an inexact number. So you should know its esoteric system. See following:

• docs.sun.com/source/806-3568/ncg_goldberg.html

• github.com/rdp/ruby_tutorials_core/wiki/Ruby-Talk-FAQ#floats_imprecise

• en.wikipedia.org/wiki/Floating_point#Accuracy_problems