Ryan10975073 wrote:
>
> The statement ($a,$b) = ($b ,$a); is swapping without a third variable.
> But looking at a lower level , it is storing a temporary variable in the
> registers.
No it's not. It's building a temporary list of two values.
> How can i get that temporary variable/value from the
> registers/memory which will have value of either $a or $b.
There is no 'temporary variable'. You are getting confused
with what Perl does and how you would write the swap in
another language.
($a,$b) = ($b ,$a)
does precisely what it says. No more and no less. If it
were implemented internally like this
$a ^= $b;
$b ^= $a;
$a ^= $b;
then where is the value that you imagine you are looking
for?
> Would love to see solution on that.
Why?
You can hold on to a temporary list like this:
use strict;
use warnings;
my ($a, $b, $c, $d);
{
my $temp = [$b, $a];
($a, $b) = @$temp;
($c, $d) = @$temp;
}
but you haven't explained what you're trying to do.
Rob
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