As was indicated to you, using the 'keys' keyword in scalar context can tell you about how many keys are there in the hash, the number of values will be similar of course to the number of keys, but to have a count of values in a way that is more sensible you will need to filter out the undefined values and return only those that are defined, in this context, using grep in conjunction with defined is a good way to go 
use strict;
use warnings;

my %hash = (
    'name'=>'hisham',
    'keyword'=>undef,
    'place'=>'the Monastery'
    );
my $key_count = keys %hash;
my $value_count = grep {defined} values %hash;

print $key_count,"\n";
print $value_count,"\n";

[download]

David R. Gergen said "We know that second terms have historically been marred by hubris and by scandal." and I am a two y.o. monk today :D, June,12th, 2011...

In reply to Re: number of keys and values in a hash by biohisham
in thread number of keys and values in a hash by veerubiji

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.