#!/usr/bin/perl -w
# Frequency Analyzer by Will Stockwell (waldo@cyberspace.org)
# Big Willy on perlmonks.org
# Thanks to japhy for the split //, lc business
# Thanks to Adam for the $i catch

my %letters;

while (<STDIN>) {
        $letters{$_}++ for split //, lc;
}

foreach (sort keys %letters) {
        if($_ eq "\n") { 
                print "\\n";
        } elsif($_ eq ' ') {
                print "<space>";
        } elsif($_ eq "\t") {
                print "\\t";
        } else {
                print "$_";
        }
        print " = $letters{$_}\n";
}

[download]

In reply to Frequency Analyzer by Big Willy

Title:
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, details, 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, summary, 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.