3!:0 %: x: 1 + x: *: x: 999999999
8
The square root cannot be represented exactly.
Henry Rich
On 4/21/2022 12:43 PM, Ed Gottsman wrote:
Hello.
I’m working on the Project Euler “Diophantine equation” problem (#66) and using J’s extended precision facilities. I’ve run into behavior that confuses me. Boiled down (and overusing x: just to be sure):
x: %: x: 1 + x: *: x: 999999999
999999999
That is (if my syntax is right), the square root of (one plus the square of a really large n) is n. I’m apparently misunderstanding something about extended precision. I’ve tried it with a variety of uses of x: but to no avail, and as I read the x: documentation…this is an odd result.
Any help would be much appreciated.
(J901 on iPadOS, for which sincere kudos to Ian Clark.)
Many thanks.
Ed
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