Re: Nested loops

$a and $b are special variables in perl, $c isn't.

You have forgotten to put my statements in your foreach loops. The $a and $b that you're using are package variables that exist, so you don't get a waring. $c is not a pre-existing package variable so you get a warning.

It's probably not a great idea to use $a and $b at all. If you were going to, the loops need to look like

foreach my $a (@list1)

Nuance

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Re^2: Nested loops by robert44444uk (Acolyte) on Sep 13, 2015 at 13:45 UTC
Ahh, that's very kind, nuance. I keep forgetting to put "my" at the front of these things.	[reply]
Re^3: Nested loops by stevieb (Canon) on Sep 13, 2015 at 14:05 UTC
As nuance stated, `$a` and `$b` are special variables to perl (used in things like `sort`. They don't need to be declared with `my` because of this). It's highly advisable that you don't use these special variables except for where they are normally expected.	[reply] [d/l] [select]
Re^3: Nested loops by AnomalousMonk (Archbishop) on Sep 13, 2015 at 15:22 UTC
`$a` and `$b` are just the beginning of Perl's pre-defined special variables. Please see perlvar (or `perldoc perlvar` on your local machine) for the whole story. Give a man a fish: `<%-{-{-{-<`	[reply] [d/l] [select]