sums with BIG numbers

[Deranged Mutant]

> Can anyone point me to any books, documentation or
> whatever that will explain the methods used in routines
> like bignum for doing sums with 'too-big' numbers.
> 
> I'm having a tough time trying to figure it out from the code 
> ;-(
> 
> Sherry
> 
What do you mean? How big numbers are added (trivially easier than multiplication
or division) or how it handles numbers that are too large for the variable's
size?