function printf(...) io.write(string.format(unpack(arg))) end

function Account:show()
  printf("Account balance = $%0.02f\n", self:balance())
end


o = Object()
o:printName()

Obj:printName() --external added object

a = Account(100)
b = Account:new(30)

print('a =', a)
print('b =', b)
print('metatable =', getmetatable(a))
print('Account =', Account)
table.foreach(Account, print)

a:show() a:deposit(50.30) a:show() a:withdraw(25.10) a:show()



parent = {}
 function parent:rob(amount)
  amount = amount or self:balance()
  self:withdraw(amount)
  return amount
end

getmetatable(Account).__index = parent

--debug.debug()