PureBasic Forums - English

Could someone give me a way to account for huge huge numbers w/out having to use a plugin-library

How huge is huge?

There is quad (varname.q as 8 byte 64 bit integer)
There is double (varname.d as 8 byte 64 bit float/real)

A 60-digit #

Anyone have any tips?

There are bignum dlls around the web if you do a google search. It shouldn't be too hard to find one that'll work well with PB. They are usually string-based and have all their own math functions for the various operations, usually including factorials. All the functions will probably take in and return a string, and there's usually not a practical limit on the number of digits they'll work with. After all, that's the whole point. You could write something in PureBasic, but this is a wheel that's been invented and optimized many times over already, so it's just a matter of finding a freely shared one. There's several, I know.

A well known big numbers lib is GMP : http://gmplib.org/

And here are some threads about how to use it with PB :
http://purebasic.fr/english/viewtopic.php?t=22635
http://www.purebasic.fr/french/viewtopic.php?t=6849

michaeled314 wrote:A 60-digit #

Okay, that is huge!

Sorry, I think you are going to have to use an external lib (such as mentioned above).

Just out of curiosity, what is this for?

If it is to handle your bank balance I want to be your friend.

And with friends like Dare...

srod wrote:

And with friends like Dare...

... who needs enemas?

It is for Project Euler at http://www.projecteuler.net

So could anyone give me a way to handle 60-digit #'s w/out having to use a plugin library

Without a library, you'll have to write your own routines. The most obvious way would be to use strings.

To be honest though, you'll be reinventing the wheel! Depends how much of a rush you're in I guess.

michaeled314 wrote:It is for Project Euler at http://www.projecteuler.net

Hi Michael,

the problems of project euler (at least the first 100 of them;) can be solved without any external library just with pure purebasic

If you've to handle longer numbers, you need usually only the functions add and multiply, you can find procedures for doing that job at... >>surprise<< http://www.purebasic.fr/english/viewtop ... 85&start=0 within my first code posting...

If you're able to optimize my routines (for speed) or even add some more functions (like div, sub) you'll be a hero (or something like that )

Michael

Found add but not multiply