I'm assuming you mean:
my $var = '';
and
my $var;
In the first example you declare the scalar variable and initialize it to the empty string. In the second example you only declare the scalar variable.
There is not one specific type set to the scalar (i.e. integer, character, etc.). Perl figures out what you want based on the context of use.
use strict;
use warnings;
my ($i, $j) = (1, 2);
my $k = '';
print $i + $j ."\n";
print $i + $k ."\n";
The first print statement adds the two values and it is easy to see this because they are both integers at that point. The second print statement will convert $k to a number and then add $i. Since you are using $k in an arithmetic operation, Perl knows that $k should be a number. Perl is very context sensitive. It is very important to learn how things behave in different contexts.
-
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.
|