@Dave
In the line t=p/1000000;
what is the value of p here or what it means?
On Feb 4, 9:57 pm, Dave <dave_and_da...@juno.com> wrote:
> @Rahul: Given that 100! < 100^100 = 10^200, we know that 100! has less
> than 200 digits. Assuming 32-bit integers, we might choose to store
> anywhere from 1 to 7 digits in an integer, realizing that we have to
> multiply the integer by a number up to 100 and still want the result
> to be less than 2^31. I'll use 5 digits in an integer. Then the
> computation can look something like this, assuming that you have
> already read n, the number whose factorial you want:
>
> int a[40], i, j, l, t;
> a[0] = 1; // rightmost "digit" of number = 0!
> l = 1; // the active number of elements of a[] used.
> for( i = 2 ; i < n ; ++i )
> {
> t = 0; // the carry into the next product
> for( j = 0 ; j < l ; ++j )
> {
> t += i * a[j]; // multiply digit by i and add carry
> a[j] = t % 10000; // extract 5 digits
> t = p / 100000; // calculate next carry
> }
> if( t > 0 ) // does the number need to add a digit?
> a[l++] = t;
> }
> printf("%i",a[l-1]);
> for( i = l-2 ; i >= 0 ; --i )
> printf("%.5i",a[i]);
> printf("\n");
>
> Dave
>
> On Feb 4, 10:19 am, Rahul Verma <rahulverma....@gmail.com> wrote:
>
>
>
>
>
>
>
> > Hi Group,
>
> > Let me help to solve this problem of
> > SPOJhttps://www.spoj.pl/problems/FCTRL2/
>
> > The approach to solve the problem is very easy and I'm confused that
> > how to store such a large no. like 100! in a variable using C++
> > Language.
>
> > Thanx & Regards,
> > Rahul Verma
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