G'day cormanaz,

@p is a global variable visible to all the subroutines (i.e. in scope). It's used in strassen() as well as store_result() (as you pointed out).

Here's a simplified example of what you're seeing. Both subroutines have access to the global array @nums:

$ perl -Mstrict -Mwarnings -E '
    say "Hello, world!";
    populate_nums();
    report_nums();
    my @nums;
    sub populate_nums { push @nums => 0 .. 9 }
    sub report_nums { say "@nums" }
'
Hello, world!
0 1 2 3 4 5 6 7 8 9
[download]

Here, only populate_nums() has access:

$ perl -Mstrict -Mwarnings -E '
    say "Hello, world!";
    populate_nums();
    report_nums();
    my @nums;
    sub populate_nums { push @nums => 0 .. 9 }
    sub report_nums { my @nums; say "@nums" }
'
Hello, world!
[download]

Perhaps take a look at perlintro - Variable scoping; and follow-up with perlsub - Private Variables via my().

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