> I still don't know how to declare arrays using only '$' instead of '@'
You can't. But you can store a *reference* to an array in a scalar.
This will work:
# the backslash ("\") returns a reference to the
# variable, so this doesn't actually pass the array,
# it passes a reference (pointer sort of) to the array.
goodsub([EMAIL PROTECTED], $scalar);
sub goodsub()
{
my ($array_ref,$scalar) = @_;
# turns the ref back to an actual array.
my @array = @{$array_ref};
# or use the array directly through the ref.
# note that changes made through a ref will change
# the original array.
print $array_ref->[0];
}
> Is it possible to write scripts using only '$'
> instead of other prefix symbols?
No, not the way you intend. You could use only references, but that
wouldn't make sense.
Rob
-----Original Message-----
From: gohaku [mailto:[EMAIL PROTECTED]
Sent: Sunday, July 18, 2004 8:59 PM
To: Perl Beginners
Subject: Another Perl datatype headache ( scalars $, hashes %, and
arrays @ )
Hi everyone,
after writing perl scripts for about 3 years now, I still have trouble
with the
basic datatypes.
I know that variables that start with '$' are scalars.
This covers Hashes ($HASH{$key}), Arrays ( $_[0] ), and
regular scalar values ( $foobar );
The code I write as well other's code is still unreadable to me
even though I have followed examples from the
Camel book, many other Perl books from O'Reilly and online references.
I have also used perldoc on many occasions.
There are still some things that haven't sunk in, such as:
If I want to add Hash keys to another Hash, I do the following:
%HASH = ( 1 => 'one' ); #NO BRACES OR ELSE....
%HASH2 = ( 2 => 'two' ); AGAIN, NO BRACES OR ELSE...
@HASH2{ keys %HASH } = "";
#confusing, considering it's the symbol used for arrays
To get the length of an array, it's $#array, not [EMAIL PROTECTED] or #$array.
Usually, I use scalar @array;
Problems with subroutines where the array is the first argument
sub badsub()
{
my (@array,$scalar) = @_;
#Pass Array last!
#my ($scalar,@array) = @_:
...
}
I still don't know how to declare arrays using only '$' instead of '@'
anyway, Is it possible to write scripts using only '$' instead of other
prefix symbols?
In other words, a php-style script written in perl
Thanks in advance.
-gohaku
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