Source code in the futurebasic programming language

local fn ThueMorse( s as Str255 ) as Str255
  Str255 k
  short  i
  
  k = ""
  for i = 1 to len$(s)
    if mid$(s, i, 1) == "1"
      k += "0"
    else
      k += "1"
    end if
  next
end fn = s + k

local fn DoIt
  Str255 tm
  short  i
  
  tm = "0"
  print tm
  for i = 1 to 7
    tm = fn ThueMorse( tm )
    print tm
  next
end fn

fn DoIt

HandleEvents