Hiya,

The addition/subtraction routines handle and produce two's complement
numbers as a matter of course.  The multiplication routines should not have
any problems with negatives.

Dividing a negative by a negative - no the 16 bit division routine presented
on my page will not do that.  It's a pretty scary proposition.  What I
usually do is convert dividend and divisor to positive values and then when
I have the positive results, I convert them to negative.

myke
----- Original Message -----
From: Lorick <lorick@AIR.ON.CA>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, February 07, 2000 9:51 PM
Subject: 16 bit PIC math question on subtracting


> I have been looking at the 16 bit math routines at
> http://www.myke.com/PICMicro/16bit.htm and I was wondering if
> someone can tell me by looking at the subtraction routine(s) there, if
they
> handle negative numbers.  I am going to need to do things where I am
ending
> up with a final result that is a positive number, maybe dividing a
negative
> by a negative, but I want to know if these routines will do negative
numbers
> for my intermediate steps.  If now, how can I?
>