The CDPD Public Domain Collection for CDTV 4/CDPD_IV.bin/e/mailinglists/amigae.0294feb.archive/000071_donews!crash!w….std.com!cosell_Thu, 17 Feb 94 08:50:25 PST.msg

Internet Message Format | 1994-05-26 | 7KB

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In-Reply-To: <[e-mail]>
         (from [e-mail] (Barry D Wills))
         (at Mon, 14 Feb 94 09:09:55 CST)
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Date: Wednesday, 16 February 1994 19:13 EST
Organization: Fantasy Farm Fibers
Message-Id: <5890:[e-mail]>
From: [e-mail] (Bernie Cosell)
To: [e-mail] (The AmigaE Mailing List)
Subject: Re: Bugs in the Mod() function

In <[e-mail]> on Feb 14, Barry D Wills wrote:

} I forgot to mention, Bernie, that the reference says:
}
} [QUOTE]
}
}   a:=Mod(b,c)
}
} Divides 32bit b by 16bit c and returns 16bit modulo a
}
} [ENDQUOTE]

Right, and in EVERY example you cited in your previous message you
carefully [and correctly] used the term "remainder".  The fact is
that this statement [QUOTE or not] is incorrect... 'modulo' is a
perfectly well-defined term [go check a textbook on abstract algebra
or group theory or galois fields or the like[*]] and what E implements
*ain't* modulo.  I wish it _were_, since modulo is a useful arithmetic
function to have.
  [*] For example, the ARexx reference I have here gives the usual
  simple explanation: "what is called 'modulo arithmetic', or,
  from its most familiar illustration in everyday life, 'clock arithmetic'.
  What is the sum of ten and seven?  Seventeen?  Not on a twelve-hour
  clock: the answer is five.  You could say that adding twelve on a clock
  is equivalent to adding zero, since it leaves the hands in the same
  position.  ..."

} This will give weird results if c exceeds max-int.
} Wouter likes it this way, so I made a function that
} does 32bit modulo:
}
}   PROC mod(this, bythat) RETURN this-Mul(bythat, Div(this, bythat))

Unfortunately it doesn't.  It returns the *remainder*.  Not the same
as modulo.  [actually it would be if EEs, the guys that designed
the ALUs on the CPU chips, had even the merest beginning of a clue
about how arithmetic works.  For a VERY long time I've argued about
this with hardware designers... they take the attitude that since
*THEY* don't know enough math to be able to tell the difference
they figure it doesn't matter, and so CPUs implement all sorts of
truly *dumb* conventions when it comes to whats-the-quotient and
whats-the-remainder.  I've learned to live with that [gritting my
teeth, of course].  I'm not as complacent about doing so with
"modulo", since there is *no*reason* to make that confusing
[and/or pretend that because _you_ don't know what the precise
definition of modulo arithmetic is, that there isn't one and so
it doesn't matter what you do].  As I suggested, if Wouter just
changes the docs to call it "Rem" or some such, my program wouldn't
have been any closer-to-working but at least it'd have been clear
what is going on.

Not a big deal in any scheme of things, but one of my hot-buttons since
I've been trying to argue some _basic_ math into hardheaded hardware
designers for almost 30 years now....

  /Bernie\
--
Bernie Cosell                               [e-mail]
Fantasy Farm Fibers, Pearisburg, VA         [phone]
From donews!crash!rbhp56.rbg.informatik.th-darmstadt.de!anh Thu, 17 Feb 94 09:05:57 PST
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Message-Id: <[e-mail]>
Date: Thu, 17 Feb 94 13:54:43 MEZ
Full-Name: Olivier Anh
In-Reply-To: <[e-mail]>; from "[e-mail]" at Feb 14, 94 10:54 pm
Mailer: Elm [revision: 66.25]
From: Olivier Anh <[e-mail]>
To: [e-mail] (The AmigaE Mailing List)
Subject: Re: int to string's

Hi Eric !
>
> {Is there a E command to convert a number to a ASCII string?
> Also what is the correct way to put an image on a Gadget button?
> and memory for it.

Yep, there is one, I learn from Barry, or Trey,....
It is the StringF() function :

DEF l,
    str[10] : STRING

l:=10

StringF(str,'\d',l)

WriteF('The string is \s\n',str)

...
--
-------------------------------------------------------------------------------
   / / Olivier ANH                        |' And may the Force be with You ! '
\ X /  [e-mail] |             - Return of the Jedi -
-------------------------------------------------------------------------------
From donews!crash!dcs.gla.ac.uk!mccracal Thu, 17 Feb 94 09:06:11 PST
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Date: Thu, 17 Feb 94 13:20:10 GMT
Message-Id: <[e-mail]>
From: [e-mail]
To: [e-mail]
Subject: fd2module

I have written a program to convert fd files to E modules.
Well in all honesty it is actually just a hack to Wouter's
pragma2module so that it reads fd files instead of pragma files.
If anybody wants it I could mail it here once I get around to
documenting it.

    Alex McCracken
Weinberg's Second Law:
    If builders built buildings the way programmers wrote programs,
then the first woodpecker that came along would destroy civilization!