Re: [FWP] JAPH made up entirely of double-chars?

[Ronald J Kimball <rjk@linguist.thayer.dartmouth.edu>]

On Fri, Mar 30, 2001 at 07:09:32PM -0800, Sean McAfee wrote:
> Recently I began toying with the idea of writing a JAPH composed entirely
> of double-characters; that is, a program for which the i-th character
> is the same as the (i+1)-th character, for all even i.  I worked on it
> for less than an hour before concluding that such a program is probably
> impossible, mainly because no Perl built-in is made of double-characters,
> nor is any operator (except qq).

And: ++ -- ** && || ..

> But I figured I would turn the challenge
> over to the FWP crowd and see if anyone can surprise me.
> 
> An additional hindrance is that the $= variable seems to implicitly
> convert to a number any scalar assigned to it.  Observe:
> 
> perl -le '$= = "testing"; print $=; $= = \5; print $='
> 
> On my machine this prints:
> 
> 0
> 135059684
> 
> Is this behavior documented anywhere?

$= is the current page length, in lines, so anything other than a number
wouldn't be meaningful.  Several of the special vars behave this way,
behave they have a restricted domain of reasonable values.  It's not
explicitly documented, though.



Ronald

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