big_int

Library for using arbitrarily large integers. Note: This library seems to 
be dead, a possible alternative is gmp.

Website: https://web.archive.org/web/20060112164857/http://valyala.narod.ru/big_int/ http://valyala.narod.ru/big_int/ (archived copy)
Github: https://github.com/valyala/big_int
Platforms supported: Win32, Linux
Headers to include: big_int/big_int.bi
Header version: from 2005
Examples: in examples/math/big_int/

Example
   #include Once "big_int/big_int_full.bi"

   Sub print_num(ByVal num As big_int Ptr)
      Dim As big_int_str Ptr s = big_int_str_create(1)
      If (s = 0) Then
         Exit Sub
      End If

      If (big_int_to_str(num, 10, s) <> 0) Then
         Exit Sub
      End If

      Print *s->Str;

      big_int_str_destroy(s)
   End Sub

      Dim As big_int Ptr bignum = big_int_create(1)

      big_int_from_int(2, bignum)
      big_int_pow(bignum, 65536, bignum)

      Print "2^65536 = ";
      print_num(bignum)
      Print

      big_int_destroy(bignum)

