If you want $k1, $k2, and $k3 to still be in scope after the loops terminate, declare them at a broader lexical scope than the confines of the loops. The only way to print them after the loops terminate is for them to still be in scope after the loops terminate, which means they have to be declared outside of the loops.

G'day virudinesh,

Perhaps you could clarify your intent or, at least, the rationale behind what you want. Currently, you're doing this:

$ perl -Mstrict -Mwarnings -E '
    my %a=();

    $a{1}{"a"}{"A"}="FIRST";
    $a{1}{"c"}{"B"}="THIRD";
    $a{1}{"b"}{"C"}="SECOND";

    foreach my $k1 ( sort keys %a ) {
      foreach my $k2 ( sort keys %{$a{$k1}} ) {
        foreach my $k3 ( sort keys %{$a{$k1}{$k2}} ) {
         print "$a{$k1}{$k2}{$k3}\n";
        }
        
      }
    }
'
FIRST
SECOND
THIRD
[download]

Did you perhaps want something like this:

$ perl -Mstrict -Mwarnings -E '
    my @items_to_print_outside_loop;
    my %a=();

    $a{1}{"a"}{"A"}="FIRST";
    $a{1}{"c"}{"B"}="THIRD";
    $a{1}{"b"}{"C"}="SECOND";

    foreach my $k1 ( sort keys %a ) {
      foreach my $k2 ( sort keys %{$a{$k1}} ) {
        foreach my $k3 ( sort keys %{$a{$k1}{$k2}} ) {
         push @items_to_print_outside_loop, "$a{$k1}{$k2}{$k3}";
        }
        
      }
    }

    print join("\n", @items_to_print_outside_loop), "\n";
'
FIRST
SECOND
THIRD
[download]

or like this:

$ perl -Mstrict -Mwarnings -E '
    sub print_outside_loop { print "@_\n" }
    my %a=();

    $a{1}{"a"}{"A"}="FIRST";
    $a{1}{"c"}{"B"}="THIRD";
    $a{1}{"b"}{"C"}="SECOND";

    foreach my $k1 ( sort keys %a ) {
      foreach my $k2 ( sort keys %{$a{$k1}} ) {
        foreach my $k3 ( sort keys %{$a{$k1}{$k2}} ) {
         print_outside_loop($a{$k1}{$k2}{$k3});
        }
        
      }
    }
'
FIRST
SECOND
THIRD
[download]

Update: removed -Mdiagnostics (3 instances). A cut-and-paste error which got accidentally propagated. It doesn't hurt but it's not needed and might be confusing with respect to the reason for its inclusion. (Oops! Update of update: s/It does hurt/It doesn't hurt/)

I do not think i understand you requirement clearly.

As you have hash of hashes you need to use loops to iterate over each of them and print the values.

If you do not want to use loop means we have Data::Dumper module to print the data structure.

Yes, Data::Dumper is another potential candidate; however, the OP probably also wants to set $Data::Dumper::Sortkeys.

-- Ken

You shouldn't use $a as variable. $a and $b are special variables in perl, used to hold results from the sort function.

As stated by others, use the Data::Dumper module for printing hashes.

use Data::Dumper;
my %not_a_or_b=();

$not_a_or_b{1}{"a"}{"A"}="FIRST";
$not_a_or_b{1}{"c"}{"B"}="THIRD";
$not_a_or_b{1}{"b"}{"C"}="SECOND";

foreach my $k1 ( sort keys %not_a_or_b ) {
  foreach my $k2 ( sort keys %{$not_a_or_b{$k1}} ) {
    foreach my $k3 ( sort keys %{$not_a_or_b{$k1}{$k2}} ) {
     print "$not_a_or_b{$k1}{$k2}{$k3}\n";
    }
    
  }
}

print Dumper(\%not_aor_b);
[download]

Nope:

Global symbol "%not_aor_b" requires explicit package name at derp.pl l
+ine 20.
Execution of derp.pl aborted due to compilation errors.
[download]

Consider running the code, or copying and pasting your actual code, to catch such errors.

Thanks again, marto,

I just wanted to HELP him, by indicating what was going wrong for him.

Vowing to never try to help out perl monks while trying to get kids on the bus in the morning, before my first cup of coffee. Will test my code next time.

Anne