Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

If you want to know how it works clearly.You print the array @_ inside your subroutine.@_ is an array which contains the arguments passed to subroutine. If you call the subroutine without using &, then it will pass the data given after two subroutine will be passed.In your case, two + 2 2 will be passed as an argument. In the subroutine, you didn't handle anything with that argument.Then, 2 will be returned from that subroutine.That's why 2 gets printed. If you use &, then 2 from the subroutine will be returned and then it added with + 2 given.Then, it will print 4.

use strict; use warnings; sub two { print @_; 2 } print "Two=%d\n", two + 2;

If you want to have the array structure , use Dumper function which is in Data module.

In reply to Re: two + 2 not equal 4! by nvivek
in thread two + 2 not equal 4! by kp2a

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others exploiting the Monastery: (6)
    As of 2018-11-13 18:29 GMT
    Find Nodes?
      Voting Booth?
      My code is most likely broken because:

      Results (158 votes). Check out past polls.