There may be a module that already implements this: 
use warnings;

use Inline C => Config =>
    BUILD_NOISY => 1;

use Inline C => <<'EOC';

SV* wotisit(SV * arg) {
  if(SvPOK(arg)) return newSVpv("string", 0);
  if(SvIOK(arg) || SvNOK(arg) || SvUOK(arg))
     return newSVpv("number", 0);
  return newSVpv("something else", 0);
}

EOC
use Math::BigInt; # for testing
my $o = Math::BigInt->new(0);

for('1', '1.1', 1, 1.1, $o) {
   print wotisit($_), "\n";
}

[download]
Outputs: 
string
string
number
number
something else

[download]
Cheers,
Rob

In reply to Re: How to check if a scalar value is numeric or string? by syphilis
in thread How to check if a scalar value is numeric or string? by bgupta

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.