Some random thoughts...

> On Dec 27, 2024, at 3:20 PM, newxito <[email protected]> wrote:
> 
> - What happens if I enter 12.999? Is that even possible? 

> - For subsequent calculations, does it use the displayed value or the 
> entered/calculated value with all decimal places?

In fixed mode my RPN calculator displays everything you enter and then 
truncates that to two decimal places on both the display and internally. It's 
commonly used for financial calculations so I would assume it's rounded up.


> - How is a result like 1234567890.65 displayed? 34567890.65 and overflow? 
> 1234567890 with no decimals? Something else?

Normally you'd use scientific notation for floating point operations with lots 
of decimal places:

123.456 = 1.23456E2

The snag here is that you don't have "E" or a minus sign for numbers < 0 
without alphanumeric tubes. Problematic.

I suppose you could at least use neon lamps and optic fibers to create decimal 
points. Commas would be cute.


What would really interest me is an RPN calculator. My beloved HP is out of 
production and used ones are going for $125 on eBay. I programmed in FORTH back 
in the day (Apple ][+; I still have it) and became very comfortable doing 
stack-based math. Once you get used to RPN you never go back.

With alphanumeric tubes you can also do hexadecimal, the other thing that I'd 
like to be able to never go back from. I hope that last sentence makes sense. 
RPN, hex, I'm there.


Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

"Would you like to see the relevant data?"—343 Guilty Spark, Halo 2

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