* [EMAIL PROTECTED] <[EMAIL PROTECTED]> [2003-07-17 21:15]: > > What is the most "interesting" program that is restricted to > > use each ASCII character at most once? > > The definition I chose was to check if a program (from @ARGV) > contains duplicate chars and printing a duplicate char iff it > has one.
Even ++, --, ==, && etc are illegal. A substitution based approach is about impossible - you need a dot in several places of the pattern, and if you have backreference you'll likely need a capture variable with the same number in the replacement expression as well. And finally, you can't refer to any variable more than once. That final one is the kicker. Basically, with all ASCII characters used at most once, you can't really write anything that needs to actually operate on data in any more but the most trivial ways. -- Regards, Aristotle
