Hi Please look at the code below:

foreach my $i (0 .. $#tokens) 
{ 
my $token = $tokens[$i]; 

$nested += $token->[1] if 'PAREN' eq $token->[0]; 
print $token->[1], $/ if 'FROM' eq uc $tokens[$i - 1][1] && 'TEXT' eq 
+$tokens[$i][0]; 
print $token->[1], $/ if 'JOIN' eq uc $tokens[$i - 1][1] && 'TEXT' eq 
+$tokens[$i][0]; 
print $token->[1], $/ if $nested = 0 && 'COMMA' eq $tokens[$i - 1][0];
+ 
}
[download]

Here the "tokens" array is something like this: PAREN 1 PAREN 1 PAREN -1 and so on..... Now I need the variable "nested" to have cumulative sum of the 2nd column of the array. I get this result if I comment the print statements in the block, if i uncomment then the cumulative some doesn't work. I am a perl newbie and may be missing something trivial. Please help.