Re: Ada.Numerics.Big_Numbers.Big_Integer has a limit of 300 digits?

[Mark Lorenzen <mark.lorenzen@gmail.com>]

On Wednesday, December 22, 2021 at 6:27:57 PM UTC+1, Michael Ferguson wrote:
> On Wednesday, December 22, 2021 at 11:02:03 AM UTC-6, Luke A. Guest wrote: 
> > On 22/12/2021 05:57, Michael Ferguson wrote: 
> > > I just started using the Big_Integer library that is a part of the 202X version of ADA. 
> > > 
> > > It is repeatedly described as an "arbitrary precision library" that has user defined implementation. 
> > > 
> > > I was under the impression that this library would be able to infinitely calculate numbers of any length, but there is clearly a default limit of 300 digits. 
> > What are you doing that requires that number of digits?
> I am working on ProjectEuler.net problem number 48. 
> 
> The questions asks you to sum the numbers n^n for (2 <= n <= 1000) and determine what the last ten digits of this number are. 

Interesting. Assume that the problem is related to the maximum size of lexical elements, can't you then use the "rem" function from Big_Integers to determine the last 10 digits e.g. by something like this Last_10_Digits = My_Very_Large_Number rem To_Big_Integer(1) ** 10?

This should give you a value of type Valid_Big_Integer consisting of up to ten digits that you can obtain the integer representation of.

Regards,
Mark L