Opps, sorry Bill, I have miscalculated the expected result, I checked
again and found my mistake. Thank for your concern.
Regards
On Fri, Nov 23, 2012 at 3:26 PM, Bill Hart <goodwillh...@googlemail.com>wrote:
> You must have a 32 bit system then.
>
> Perhaps if you tell us what result you are getting and what result you
> were expecting, we can help you more.
>
> Bill.
>
> On 23 November 2012 13:24, mgundes <mg...@hotmail.com> wrote:
> >
> > I changed but the result are same as previous, since both are in same
> size
> > in my system I guess.
> >
> >
> > On Fri, Nov 23, 2012 at 3:14 PM, Bill Hart <goodwillh...@googlemail.com>
> > wrote:
> >>
> >> One problem is that you are using unsigned int, instead of mp_limb_t
> >> (which is probably unsigned long or unsigned long long on your
> >> machine).
> >>
> >> Bill.
> >>
> >> On 23 November 2012 13:12, mgundes <mg...@hotmail.com> wrote:
> >> >
> >> > Hi Bill, thanks for reply.
> >> >
> >> > I run simple code below for different lengths of array
> >> > muıltiplication
> >> > and I got weird results with gmp_printf(). I also printed c array and
> it
> >> > seems true but printed result is weird. What is wrong or missing in
> >> > function
> >> > below?
> >> >
> >> > int main() {
> >> >
> >> > unsigned int a[4] = {100, 20, 30, 40};
> >> > unsigned int b[4] = {200, 10, 5, 120};
> >> > unsigned int c[8];
> >> >
> >> > memset(c, 0, 8 * sizeof(unsigned int));
> >> > mpn_mul((mp_limb_t *) c,
> >> > (mp_limb_t *) a, 1,
> >> > (mp_limb_t *) b, 1);
> >> >
> >> > for (int i=0; i<8; i++)
> >> > printf("c[%d]: %u\n", i, c[i]);
> >> > gmp_printf("\nresult: %Nu\n\n\n", c, 8);
> >> >
> >> >
> >> > memset(c, 0, 8 * sizeof(unsigned int));
> >> > mpn_mul((mp_limb_t *) c,
> >> > (mp_limb_t *) a, 2,
> >> > (mp_limb_t *) b, 3);
> >> >
> >> > for (int i=0; i<8; i++)
> >> > printf("c[%d]: %u\n", i, c[i]);
> >> > gmp_printf("\nresult: %Nu\n\n\n", c, 8);
> >> >
> >> > memset(c, 0, 8 * sizeof(unsigned int));
> >> > mpn_mul((mp_limb_t *) c,
> >> > (mp_limb_t *) a, 4,
> >> > (mp_limb_t *) b, 4);
> >> >
> >> > for (int i=0; i<8; i++)
> >> > printf("c[%d]: %u\n", i, c[i]);
> >> > gmp_printf("\nresult: %Nu\n\n\n", c, 8);
> >> >
> >> >
> >> > return 0;
> >> > }
> >> >
> >> > Kind Regards,
> >> > Thanks
> >> >
> >> > MahmutG
> >> >
> >> >
> >> > On Fri, Nov 23, 2012 at 3:09 AM, Bill Hart <
> goodwillh...@googlemail.com>
> >> > wrote:
> >> >>
> >> >> The result could be up to 8 limbs, which is why you should allocate 8
> >> >> limbs for c. The top limb might turn out to be zero of course.
> >> >>
> >> >> The easiest way to print the result is to use gmp_printf with the %N
> >> >> option for mpn's. You need to also give it the number of limbs, as
> >> >> documented on pages 67-68 of our documentation.
> >> >>
> >> >> Bill.
> >> >>
> >> >> On 23 November 2012 00:55, mgundes <mg...@hotmail.com> wrote:
> >> >> >
> >> >> > Hi,
> >> >> >
> >> >> > I am not good at arithmetic but I need to calculate multiplication
> of
> >> >> > big
> >> >> > numbers. I will try to explain my need:
> >> >> >
> >> >> > For instance, if I have two 128 bit numbers represented with arrays
> >> >> > below:
> >> >> >
> >> >> > unsigned int a[4] = {100, 20, 30, 40};
> >> >> > unsigned int b[4] = {200, 10, 5, 120};
> >> >> > unsigned int c[4] = {0,0,0,0};
> >> >> >
> >> >> > I want to multiply a and b, then assign the result to the c:
> >> >> >
> >> >> > mpn_mul_n((mp_limb_t *)c, (const mp_limb_t *)a, (const
> >> >> > mp_limb_t
> >> >> > *)b,
> >> >> > 4);
> >> >> >
> >> >> > Since mpn_mul takes result pointer as mp_limb_t type, then what if
> >> >> > result
> >> >> > exceeds? I mean the result of two integer multiplication probably
> >> >> > exceeds
> >> >> > integer size. Is there any example for multiplication of big
> numbers?
> >> >> > I
> >> >> > tried mpn_mul_n() as above and used mpn_get_str to see the result
> but
> >> >> > I
> >> >> > guess I could not use correctly.
> >> >> >
> >> >> > Kind regards,
> >> >> > Thanks
> >> >> >
> >> >> > --
> >> >> > MahmutG
> >> >> >
> >> >> > --
> >> >> > You received this message because you are subscribed to the Google
> >> >> > Groups
> >> >> > "mpir-devel" group.
> >> >> > To post to this group, send email to mpir-devel@googlegroups.com.
> >> >> > To unsubscribe from this group, send email to
> >> >> > mpir-devel+unsubscr...@googlegroups.com.
> >> >> > For more options, visit this group at
> >> >> > http://groups.google.com/group/mpir-devel?hl=en.
> >> >>
> >> >> --
> >> >> You received this message because you are subscribed to the Google
> >> >> Groups
> >> >> "mpir-devel" group.
> >> >> To post to this group, send email to mpir-devel@googlegroups.com.
> >> >> To unsubscribe from this group, send email to
> >> >> mpir-devel+unsubscr...@googlegroups.com.
> >> >> For more options, visit this group at
> >> >> http://groups.google.com/group/mpir-devel?hl=en.
> >> >>
> >> >
> >> >
> >> >
> >> > --
> >> > MahmutG
> >> >
> >> > --
> >> > You received this message because you are subscribed to the Google
> >> > Groups
> >> > "mpir-devel" group.
> >> > To post to this group, send email to mpir-devel@googlegroups.com.
> >> > To unsubscribe from this group, send email to
> >> > mpir-devel+unsubscr...@googlegroups.com.
> >> > For more options, visit this group at
> >> > http://groups.google.com/group/mpir-devel?hl=en.
> >>
> >> --
> >> You received this message because you are subscribed to the Google
> Groups
> >> "mpir-devel" group.
> >> To post to this group, send email to mpir-devel@googlegroups.com.
> >> To unsubscribe from this group, send email to
> >> mpir-devel+unsubscr...@googlegroups.com.
> >> For more options, visit this group at
> >> http://groups.google.com/group/mpir-devel?hl=en.
> >>
> >
> >
> >
> > --
> > MahmutG
> >
> > --
> > You received this message because you are subscribed to the Google Groups
> > "mpir-devel" group.
> > To post to this group, send email to mpir-devel@googlegroups.com.
> > To unsubscribe from this group, send email to
> > mpir-devel+unsubscr...@googlegroups.com.
> > For more options, visit this group at
> > http://groups.google.com/group/mpir-devel?hl=en.
>
> --
> You received this message because you are subscribed to the Google Groups
> "mpir-devel" group.
> To post to this group, send email to mpir-devel@googlegroups.com.
> To unsubscribe from this group, send email to
> mpir-devel+unsubscr...@googlegroups.com.
> For more options, visit this group at
> http://groups.google.com/group/mpir-devel?hl=en.
>
>
--
MahmutG
--
You received this message because you are subscribed to the Google Groups
"mpir-devel" group.
To post to this group, send email to mpir-devel@googlegroups.com.
To unsubscribe from this group, send email to
mpir-devel+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/mpir-devel?hl=en.
