# http://forums.macrumors.com/showthread.php?t=382617
# http://www.tanguay.info/web/codeExample.php?id=854

class BankAccount
	
	attr_accessor :accountNumber, :accountName 

	# must initialize value with constructor for read only variables	
	attr_reader :readonlyvar		
	def initialize(initialvalue)
	 	@readonlyvar = initialvalue
	end
end  

account = BankAccount.new(100.00)

account.accountNumber = "54321"     
account.accountName = "Fred Flintstone"
puts account.accountNumber
puts account.accountName

puts account.readonlyvar
account.readonlyvar = 52	# runtime error