Implements "for" like c, cpp, java, etc

cfor.rb

module Kernel
	def cfor(init, condition, inc)
		while condition.()
			yield 
			inc.()
		end
	end
end

if ($0 == __FILE__)
	cfor(i = 1, ->{i < 20}, ->{i += 1}) do
		puts i
	end
end