That is the unexpected result that I gaet from the following code. Why is it making a hash?

Because this is what you wrote 

my $hashref = {};
my %hash = $hashref;

[download]
%hash now contains a single key (keys are only strings), which is $hashref stringified (meaning no longer a reference). See for yourself 
$ perl -MData::Dump -e " dd { {} } "
{ "HASH(0x3f8a6c)" => undef }

[download]

Say it with me:

my $hashref = { 'hashes', 'are', 'curly', 'ones' };

my $arrayref = [ 'arrays', 'are', 'square' ];

my %hash = ( 'lists are round' , 'hashes want pairs');

I highly recommend perlintro, http://learn.perl.org/books/beginning-perl/, http://perl-tutorial.org/, Modern Perl , Tutorials: Basic debugging checklist , brian's Guide to Solving Any Perl Problem

In reply to Re: Please help me print this hash. by Anonymous Monk
in thread Please help me print this hash. by Je55eah

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.