Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Just a couple of comments:

  • use arrays instead of all those ifs -- think about the problems you'll get into if you want to add,remove or change one of alphabet sets,
  • use for and foreach instead of array indexes -- they do the same thing with less code and less variables,
  • when accessing a single array element use '$text[$w]' rather than '@text[$w]' -- the first character tells Perl that you want to get a scalar (single) value, not an array,
  • use strict and -w (my generic advice ;-)),

And my attempt at rewriting your code:

#!/usr/bin/perl -w use strict; # One array instead of 2x8 if statements my @alphabets = ( "seklbvrfzijdqypcnowmtxuagh", "elbtjpwdvzqaorfiyxnukmghsc", "velukbiyxnordctjgpwhzqafms", "orsdvejwmcbiyhfzlukxntqgpa", "yxsdicvejqfbhmpluaorgkztwn", "ejqyxsdkziurgtwcaovfbhmpln", "jqyhcaxsdlkziuevfrgtwobmpn", "atdvnsirekmfqhwobjclgypxuz" ); my $dec = $ARGV[0] && ($ARGV[0] eq '-d'); # are we decoding? my ( $i, $out ) = ( 0, '' ); foreach ( split / /, <STDIN> ) { # read and split a single li +ne if ( $dec ) { eval "tr/$alphabets[$i]/a-z/"; # decoding tr/// # We need eval because tr/// + does # not allow for substitution +s } else { tr/A-Z/a-z/; eval "tr/a-z/$alphabets[$i]/"; # encoding tr/// -- as above +, # just reversed } $out .= "$_ "; $i = ($i + 1) % @alphabets; # this will walk through 0..7 circle } print "$out\n";

Update: I just noticed the 'reverse' operations in your code -- I skipped them during rewrite and yet the programs are compatible ;-) 'Reverse' does not modify its argument, so you probably wanted to use @text = reverse @text;


In reply to Re: Polyglot (crypto) by marcink
in thread Polyglot (crypto) by beretboy

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others lurking in the Monastery: (6)
    As of 2018-06-24 23:37 GMT
    Find Nodes?
      Voting Booth?
      Should cpanminus be part of the standard Perl release?

      Results (126 votes). Check out past polls.