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.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|