Hi, the scope of variables has been a problem for me as I'm writing my casual scripts. For some reasons I have been having trouble accessing some of my variables (declared by "my")although they should be inside the block as I do see those. Maybe some of you can show me what is wrong. I guess I am having some trouble understanding what a block is that could contain a declaration. For example this script: 

#!/usr/bin/perl -w
use strict;
use warnings;   

while (my $line=<>)
{
my @part=split(/\t/,$line);
my @saba=split(/\|/,$part[2]);

    for(my $i=0;$i<@saba;++$i)
    {
    if ($saba[$i]!~m/unclassified/)
        {(if $i==$saba){print "$_\n";}
          else {print "$_|";}
        }
    else
        {if ($i==$saba){print "unclassified_$saba[$i-1]\n";}
         else {print "unclassified_$saba[$i-1]|";}
        }
    }

}

[download]
will post errors 
syntax error at ./claskri.pl line 13, near "(if"
Global symbol "$saba" requires explicit package name at ./claskri.pl l
+ine 13.
syntax error at ./claskri.pl line 16, near "else"
Global symbol "$i" requires explicit package name at ./claskri.pl line
+ 17.
Global symbol "$saba" requires explicit package name at ./claskri.pl l
+ine 17.
syntax error at ./claskri.pl line 18, near "else"
Execution of ./claskri.pl aborted due to compilation errors.

[download]
I do not understand as I have declared my @saba already in encasing brackets. Should a loop inside those understand that I am trying to access the variable a "a level" up so to speak. What I want is for all those loops to have access to variable @saba (or $saba in scalar context). Right now it seems perl looks the innermost loops and checks that the saba is not declared locally within these (by not having "my" infornt them) - then demands it to be declared globally. What would be seem more normal for me would it to check one loop outside to check if it is declared in this - a sort of inheritance so to speak. I do not dare do declare it inside these innermost loops as then it would probably remain empty == not assosiated with the actual saba form outer loop. And I do not want to declare it globally - as to eventually avoid colliding variable names.

In reply to scoping problems by naturalsciences

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