I suggest a simple bubble sort.
put the numbers in 4 registers say num1-num4
compare num4 to num3.
if num3 is higher, swap the 2 registers.
if num 4 is higher, do nothing.
compare num4 and num3, num3 and num2, num2 and num1.
do this for three passes and your numbers are sorted, with the highest in
num4 and the lowest in num1.



----- Original Message -----
From: "Thomas N" <thomasn101@HOTMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, April 12, 2001 11:24 AM
Subject: Re: [PIC]: Compare 4 numbers method. Please help!


> Hi Bob,
>
> Thank you for your quick reply.  The numbers are 8-bits from four ADC (so
> they are unsigned).  I would like to write the code in MPLAB assembly
> language (35 instructions).  The speed or memory is not very important.
>
> The memory location I called "RESULT" stores the information which tell me
> which number is the biggest, big, small, and smallest.
>
> For your information, the inputs of the ADCs are from four CdS
photoresistor
> cells and basically I want to determine where the brightest or darkest
spot
> is.
>
> Sincerely,
> Thomas
>
> >From: Bob Ammerman <RAMMERMAN@PRODIGY.NET>
> >Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
> >To: PICLIST@MITVMA.MIT.EDU
> >Subject: Re: [PIC]: Compare 4 numbers method.  Please help!
> >Date: Thu, 12 Apr 2001 12:30:02 -0400
> >
> >ie: you need to sort these numbers.
> >
> >what language.
> >
> >how big can the numbers be?
> >
> >are they signed or unsigned?
> >
> >what is more important, speed or code space?
> >
> >Bob Ammerman
> >RAm Systems
> >(contract development of high performance, high function, low-level
> >software)
> >
> >----- Original Message -----
> >From: "Thomas N" <thomasn101@HOTMAIL.COM>
> >To: <PICLIST@MITVMA.MIT.EDU>
> >Sent: Thursday, April 12, 2001 12:27 PM
> >Subject: [PIC]: Compare 4 numbers method. Please help!
> >
> >
> > > Hi everyone,
> > >
> > > I need to compare 4 numbers stored in Number1, Number2, Number3, and
> > > Number4.  The result will be stored in the RESULT memory.
> > >
> > > I need to find out which one is the biggest, big, small, and smallest.
> > > Please help me!
> > >
> > > Thank you in advance!
> > > Thomas
> >
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