Re: exercise in double number arithmetic

On 7/6/24 16:59, Ahmed wrote:

Why using double arithmetic when we can use simply Pascal triangle?
...

Yes! I had forgotten about Pascal's triangle when I coded my solution. A benefit of your double number solution is that it works on both 32-bit and 64-bit Forth systems.
Here's my solution for the specific problem, which will only work on a 64-bit system:
: solution ( -- d)
     1 s>d 43 22 do i 1 m*/ loop d>f
     21 dup s>d rot 2 do I 1 m*/ loop d>f
     f/ fround f>d ;
We don't have D/ in the standard, which necessitated the conversion to float for dividing two double length numbers and then convert back to double.
--
Krishna