Thanks, Brian - I thought I needed to put in a temporary intermediate
value to avoid
reversing the first change, hence the three pairs rather than two.
But the enigma remains, doesn't it: what stops ']' becoming ')' ? Do
rplc and/or
stringreplace only work on a maximum of two pairs of before and after?
Peter Vernigorov's post is useful, but, again, avoids the difficulty
by using an
alternative function, one which I overlooked, I admit.
Cheers,
Mike
On 18/12/2020 18:54, Brian Schott wrote:
What about the following?
( '()',')(' ) stringreplace|. '1 + (2 * 3) + (4 * (5 + 6))'
((6 + 5) * 4) + (3 * 2) + 1
On Fri, Dec 18, 2020 at 1:21 PM 'Michael Day' via Programming <
programm...@jsoftware.com> wrote:
Unlike in the K forum, the J-wires have been virtually silent on this
year's Advent of Code...
Anyway, today's problem, number 18, might interest J & APLers as part
1 is ALMOST
plug-it-in to J/APL; there's just one twist, so to speak, namely we
need to reverse an
arithmetic expression, eg
1 + (2 * 3) + (4 * (5 + 6))
needs to be evaluated as
((6 + 5) * 4) + (3 * 2) + 1
--
(B=) <-----my sig
Brian Schott
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