Dual precision numbers

ScottL

I have an application where I need to display a decimal number greater than 65535. (word) Does anyone have an idea of how to collect numbers greater than 65535 and display them using LCDOUT?· -Scott

Bruce Bates

Scott -

Here are some double precision math routines which should do the trick, thanks to Dr. Tracy Allen:
http://www.emesystems.com/BS2math6.htm

Regards,

Bruce Bates

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ScottL

Thanks, looks like that will do the trick. -Scott

Mike Green

If you mostly need to input and output or count or add, you could do binary coded decimal (BCD) with a decimal digit per nibble. The Stamp can access nibbles (4 bits) as arrays storing two decimal digits per byte. A simple loop could add two 8 digit numbers one digit at a time like:
a var nib(8)
b var nib(8)
c var byte
i var nib
add:
c = 0
for i=0 to 7
c = a + b + c
if c >= 10 then carryIt
a = c : c = 0
goto fini(expletive)
carryIt:
a = c - 10: c = 1
fini(expletive):
next
return

Mike Green

Note that the forum software censored my label f.i.n.i.s.h.I.t [noparse][[/noparse]ignore the periods].

Mike Green

It also removed my 'i' subscripts after the 'a' and 'b' variables. Oh well!

Jon Williams

We've had some unruly teenagers attempting to post foul language in recent months so we've had to enable auditing for "naughty" keywords -- I think Finish_It would have flown through and looks like a valid label (in accordance with "The Elements of PBASIC Style").

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Jon Williams
Applications Engineer, Parallax

SSteve

And you would have had better luck with the subscripts if you had enclosed the code in a code tag. Outside of the code tag the i in square brackets turns italics on. That's why some of the code is italicized.

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OS-X: because making Unix user-friendly was easier than debugging Windows

ScottL

Mike, thanks for the BCD idea. Unfortunately I could not follow your example but I was able to take the idea and make it work. (though not efficiently) -Scott