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Re: Palindrome array

by Jim (Curate)
on Dec 29, 2012 at 09:01 UTC ( #1010804=note: print w/replies, xml ) Need Help??

in reply to Palindrome array

This isn't C. In Perl, a palindrome is properly represented as a string, not an array of characters.

#!perl use strict; use warnings; my $string = "A Man, A Plan, A Canal -- Panama!"; my $letters = lc $string; $letters =~ s/\W//g; printf qq/"%s" %s a palindrome.\n/, $string, $letters eq reverse($letters) ? "is" : "isn't"; __END__ "A Man, A Plan, A Canal -- Panama!" is a palindrome.

If this is a homework assignment, tell your teacher you expect to be given more verisimilar programming problems. ;-)

If you're writing a Perl program to identify palindromic sequences in nucleic acids, you should still use strings, not arrays of characters, in my opinion.


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[davido]: yeah, umount -f isn't powerful enough.
[tye]: probably something in the init subsystem that does the mounting that you could disable and reboot.
davido needs to close laptop to board flight home from yapc.
[davido]: I'll look into it in a few hours probably.
[davido]: when i do get to that point I think I'll do it in a vm snapshot just in case. :)
[oiskuu]: tye, you were right: loginuid/sessionid are part of task struct if compiled with AUDITSYSCALL. I have some doubts if you should actually depend on that feature.
[Corion]: oiskuu: Depends on what you want to do with that information
[tye]: I'm not depending on that feature. But I could in this environment. I'm using getlogin(). shrug
[Corion]: For benign logging (which user started this DB instance), it's OK
[tye]: We use auditd for security monitoring. So we can rely on auditing being enabled. I'm not sure who would want to not be able to audit. Maybe some VM inside another system with audit?

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