This is the program I came up with from your description (I hope it's what you meant). Problems are often better described with code, rather than English.
use strict;
use warnings;
my $variable = 1;
print $variable;
subroutine();
sub subroutine {
my $variable = 2;
print $variable;
}
#Output:
#12
Each print prints the value of the $variable it's closest to (in this example only, it's not a rule).
I fairly sure you will benefit from reading Coping with Scoping. It'll help you understand Perl's notion of global and local variables.
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