class MyClass

  SOME_CONST = "alpha"       # A class-level constant

  @@var = "beta"             # A class variable
  @var = "gamma"             # A class instance variable

  def initialize
    @var = "delta"           # An instance variable
  end

  def mymethod
    puts SOME_CONST          # (the class constant)
    puts @@var               # (the class variable)
    puts @var                # (the instance variable)
  end

  def MyClass.classmeth1
    puts SOME_CONST          # (the class constant)
    puts @@var               # (the class variable)
    puts @var                # (the class instance variable)
  end

end

def MyClass.classmeth2
  puts MyClass::SOME_CONST   # (the class constant)
  # puts @@var               # error  out of scope
  puts @var                  # (the class instance variable)
end


myobj = MyClass.new
MyClass.classmeth1           # alpha, beta, gamma
MyClass.classmeth2           # alpha, gamma
myobj.mymethod               # alpha, beta, delta