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Re: Can GNU-Prolog handle big integer?

From: Daniel Diaz
Subject: Re: Can GNU-Prolog handle big integer?
Date: Mon, 16 Jun 2014 09:12:25 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0


You are right, GNU Prolog uses bounded integers, whose bounds depend on the architecture (32/64 bits). You can know these limits with (e.g. on a 64 bits machine):

| ?- current_prolog_flag(min_integer,X).

X = -1152921504606846976

| ?- current_prolog_flag(max_integer,X).

X = 1152921504606846975


A workaround to store bigger integers is to spit them into 2 parts and for instance use a Prolog structure to record them.


Le 12/06/2014 21:20, Shuai Wang a écrit :
Hello gnu-prolog users,

I am new to prolog and I just have a quick question..

So basically on my 32bit x64 Linux, It seems that in GNU-Prolog, integer has only 28bits, so code like below can't be compiled by gplc.

    X is 0xdeadbeef.

After a quick search, I still don't know how to use GNU-Prolog to handle big integer...

I might be able split a 32bit integer like 0xdeadbeef into two 16bit integers 0xdead and 0xbeef and concat when necessary, but is there any more convenient way to do this?

Best Regards,

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