# from https://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Classes

class MyClass
  @@value = 1
  def add_one
    @@value= @@value + 1
  end
  
  def value
    @@value
  end
end
instanceOne = MyClass.new
instanceTwo = MyClass.new
puts instanceOne.value
instanceOne.add_one
puts instanceOne.value
puts instanceTwo.value