my %hash=(A=>4, B=>5, C=>10, D=>2, E=>9);
my @zip = map { [ $_, $hash{$_} ] } sort keys %hash;
do {
   my $f = shift @zip;
   print ("@$f * @$_ = ", $f->[1] * $_->[1], "\n") for (@zip);
} while (@zip);

[download]
Or alternatively being a smidgen easier to read: 
my %hash=(A=>4, B=>5, C=>10, D=>2, E=>9);
my @zip = sort keys %hash;
do {
   my $f = shift @zip;
   for (@zip) {
       my ($v1,$v2) = @hash{$f,$_};
       print "$f($v1) * $_($v2) = ", $v1 * $v2, "\n";
   }
} while (@zip);

[download]
A(4) * B(5) = 20
A(4) * C(10) = 40
A(4) * D(2) = 8
A(4) * E(9) = 36
B(5) * C(10) = 50
B(5) * D(2) = 10
B(5) * E(9) = 45
C(10) * D(2) = 20
C(10) * E(9) = 90
D(2) * E(9) = 18

[download]

In reply to Re: iterations in a hash by Loops
in thread iterations in a hash by madM

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.