Select Code to Download

use strict;                                                  
use warnings;                                                
...
    my ($msg, $value) = @_;                                  
    print $msg, (defined $value ? '' : 'not '), "defined.\n";
}

Beginning state: $c is not defined.
SV = NULL(0x0) at 0x1f5cec0
...
  IV = 0
  NV = 0
  PV = 0