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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