year19-small.hrm

-- HUMAN RESOURCE MACHINE PROGRAM --

-- 19: Countdown

-- INSTRUCTIONS: "For each number in the INBOX, send that number to the
-- OUTBOX, followed by all numbers down to (or up to) zero. It's
-- a countdown!"

-- AVAILABLE COMMANDS: INBOX, OUTBOX, COPYFROM, COPYTO, ADD, SUB,
-- BUMPUP, BUMPDN, JUMP, JUMPZ, JUMPN, COMMENT

-- SIZE: 10 commands (challenge 10)
-- AVERAGE RUNTIME: 111 steps (challenge 82)


-- Technically it's only necessary to check the sign at the beginning to
-- know whether to count up or down, but doing it on every iteration
-- saves commands.

a:
    INBOX
    COPYTO   0
    JUMP     c
b:
    BUMPUP   0
c:
d:
    OUTBOX
    COPYFROM 0
    JUMPZ    a
    JUMPN    b
    BUMPDN   0
    JUMP     d


-- vim: set autoindent: