Why doesn't this work if the first acessor is at the bottom (2 scenarios)

gistfile1.rb

#This works:
class Ticket
	
	def price                               #
		@price		         	# this will be moved to the bottom below on the 2nd example
	end					#
	def price(amount)
		if (amount * 100).to_i == amount * 100
			@price = amount
		else
			puts "The price seems to be malformed"
		end
	end
	
end

bil = Ticket.new
puts bil.price(59)
#but if we switch the first accessor place, it stops working sand says that there are too many arguments 

class Ticket


	def price(amount)
		if (amount * 100).to_i == amount * 100
			@price = amount
		else
			puts "The price seems to be malformed"
		end
	end
	def price				#  
		@price				# It's now here
	end					#
	
end

bil = Ticket.new
puts bil.price(59)