Weeks start on Monday

# The Greeter class
class Greeter
  def initialize(name)
    @name = name.capitalize
  end
 
  def salute
    puts "Hello #{@name}!"
  end
end
 
# Create a new object
g = Greeter.new("world")
 
# Output "Hello World!"
g.salute

#!/usr/bin/env ruby
# The NetMask class
class NetMask
	@mask
	@baseIP
	def initialize()
		@mask = 0
		@baseIP = 0
	end
	def parseFromString(str)
		array = str.split(".")
		if array.length != 4
			array = str.split("-")
		end
		if array.length == 4
			@mask = array[0].to_i + array[1].to_i * 256 + array[2].to_i * 65536 + array[3].to_i * 16777216
		end
	end
	def setFromInt(value)
		@mask = ('1' * value + '0' * (32 - value)).to_i(2)
	end
	def parseBaseIPFromString(str)
		array = str.split(".")
		if array.length != 4
			array = str.split("-")
		end
		if array.length == 4
			@baseIP = array[0].to_i * 16777216 + array[1].to_i * 65536 + array[2].to_i * 256 + array[3].to_i
		end
	end
	def formatIntToIP(int)
		return (int/16777216).to_s+ "." + ((int/65536)%256).to_s + "." + ((int/256)%256).to_s + "." + (int%256).to_s
	end
	def getMask()
		return formatIntToIP(@mask)
	end
	def getBaseIP()
		return formatIntToIP(@baseIP)
	end
	def generateIPList()
		array = []
		for i in (@baseIP & @mask) .. ((@baseIP & @mask) | ((2**32)-1)-@mask) do
			array.push(formatIntToIP(i))
		end
		return array
	end
end
 
mask = NetMask.new()
args = ARGV[0].split("/")
if args.length == 2
	mask.parseBaseIPFromString(args[0])
	mask.setFromInt(args[1].to_i)
else
	mask.parseBaseIPFromString(ARGV[0])
	mask.setFromInt(ARGV[1].to_i)
end
puts mask.generateIPList()