Date: Wed, 8 May 2002 09:20:11 -0400 (EDT) From: John Mills <jmmills@telocity.com> To: Z Kuang <zhiwenkuang@hotmail.com> Cc: questions@FreeBSD.ORG Subject: Re: your mail Message-ID: <Pine.LNX.4.21.0205080908180.2883-100000@otter.mills-atl.com> In-Reply-To: <F101NWep4CMxfqclwml000125ec@hotmail.com>
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On Wed, 8 May 2002, Z Kuang wrote:
> The program now generates paper tape output. This format is based on the
> well
> known 'Morse Code', which consists of 'dots' and 'dashes'. On paper tape, a
> 'dash' is represented by a hole in the bottom half of the paper, and a 'dot'
> by a hole in the top half. The program simulates the hole by printing the
> letter 'o'.
Morse code is strictly sequential ('dots' and 'dashes' do not overlap,
and their order is significant), and also includes inter-character and
inter-element delays. I suggest a 'space' between characters.
> The Morse Codes for hex digits are as follows:
>
> A .-
> B -...
> C -.-.-
> D -..
> E .
> F ..-.
> 0 -----
> 1 .----
> 2 ..---
> 3 ...--
> 4 ....-
> 5 .....
> 6 -....
> 7 --...
> 8 ---..
> 9 ----.
> The paper tape output for the number BAD would now be:
>
> oooo oo
> o oo
I would thus have expected:
-
ooo o oo
o o o
-
I suggest you first write your program in 'C' (or some other mid-level
language if you don't know 'C'), then recode in assembly. I suggest this
because you will have to create a data structure which includes at least
two lines of characters, and your entire hex number into those lines, then
print out the first line, a 'newline', the second line, and another
'newline'.
Of course you can print the hex values to the screen in the order they are
typed.
I recommend 'C' because it is easy to write low-level logic and data
structures in 'C'.
Naturally this is not the most expert way to write a program, but you need
to 'divide and conquer' the parts of the assignment one at a time.
- John Mills
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