Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number

Re: I need help with the error "Modification of non-creatable array value attempted"

by Hramyzn (Novice)
on Jul 14, 2014 at 18:19 UTC ( #1093592=note: print w/replies, xml ) Need Help??

in reply to I need help with the error "Modification of non-creatable array value attempted"

Thanks guys, and in the meantime, I've finished the rest of the program. Seems to work perfectly and I'm gonna post it here for everyone to see (maybe it'll be useful to someone.. who knows). Also I'll take a look at what Bethany suggested. But for now, using arithmetic division and modulo worked xD Here's the code if anyone wants it. When running it from a command line type perl than whatever you name the file followed by arguments which go: IP address to subnet, current mask, number of hosts/subnets, "hosts" or "subnets" depending on what you want and in the end, the maximum number of subnets to display. It then displays the new mask, and the subnets including their first and last IP address.

sub dec_to_bin { my $number= $_[0]; my $position= $_[1]; while($number!= 0) { $adress_bin[$position]= $number % 2; $position--; $number= int($number/ 2); } } sub bin_to_dec { my $sum= 0; my $mult= 128; my $i; for $i($_[0] .. $_[1]) { $sum+= $mult* $adress_bin[$i]; $mult/= 2; } return $sum; } sub dec_print { print bin_to_dec(0, 7), ".", bin_to_dec(8, 15), ".", bin_to_dec(16 +, 23), ".", bin_to_dec(24, 31); } sub num_of_bits { my $i= 2; my $number= 2; while($number< $_[0]) { $i++; $number= (2** $i)-2; } return $i; } $adress_dec= $ARGV[0]; $old_mask= $ARGV[1]-1; $num_of= $ARGV[2]; $sub_host= $ARGV[3]; $max_to_show= $ARGV[4]; @adress_dec= split(/\./, $adress_dec); for $i (0 .. 31) { $adress_bin[$i]= 0; } dec_to_bin($adress_dec[3], 31); dec_to_bin($adress_dec[2], 23); dec_to_bin($adress_dec[1], 15); dec_to_bin($adress_dec[0], 7); if($sub_host eq "hosts") { $new_mask= 31- num_of_bits($num_of); } else { $new_mask= $old_mask+ num_of_bits($num_of); } print "New mask: ", $new_mask+1, "\n\n"; $to_show= (2**($new_mask- $old_mask))-2; if($to_show> $max_to_show) { $to_show= $max_to_show; } for $i(1 .. $to_show) { $temp= $i; $i2= $new_mask; while($temp!= 0) { $adress_bin[$i2]= $temp % 2; $i2--; $temp= int($temp/ 2); } for $i2($new_mask+1 .. 31) { $adress_bin[$i2]= 0; } dec_print(); print "\n\t"; $adress_bin[31]= 1; dec_print(); print "\n\t"; for $i2($new_mask+1 .. 31) { $adress_bin[$i2]= 1; } $adress_bin[31]= 0; dec_print(); print "\n"; }
  • Comment on Re: I need help with the error "Modification of non-creatable array value attempted"
  • Download Code

Log In?

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://1093592]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others contemplating the Monastery: (2)
As of 2022-10-01 20:58 GMT
Find Nodes?
    Voting Booth?
    My preferred way to holiday/vacation is:

    Results (3 votes). Check out past polls.