Getting past the 32bit limit

[Cleptography]

Sure this has been asked and explained so I apologize if I am rehashing an old subject. I'm just curious if it has been done or is possible to work with values past the 32-bits of precision.

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@echo off
 setlocal

REM This works
set /a val=1000000000+1000000000
echo.%val%

REM Does not work exceeds the 32bit limit
set /a val=10000000000+1000000000
echo.%val%

REM      10000000000
REM   +   1000000000
REM   --------------
REM      11000000000

[orange_batch]

calc.vbs:

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wscript.echo eval(wscript.arguments(1))

and...

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cscript calc.vbs //nologo "2147483648^2"

Or you can split DOS's 32-bit numbers depending on what you're working with. Mileage varies with the digit you choose to split at. This is faster than the vbscript but has less range:

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set number=987654321
set step=000%number:~-4%
set /a low=1%step:~-4%-10000,high=%number:~,-4%+0

First you pad on one less zero than the number of digits you split at (allows for numbers lower than 1000 when splitting at 4).
Then for low you put a one before that number truncated (to remove the excess padding) and subtract 10000. This prevents DOS from thinking it's an octal due to the leading zeros.
For high you add +0 on the end in case number isn't longer than 4 digits in the first place, to prevent an error.

The math from there is some simpler logic. You can accumulate large numbers simply too, by running this as a function and changing low= and high= to low+= and high+=.