#! perl
use v5.14.1;
use strict;
use warnings;
use Wx qw(wxID_YES wxID_NO wxID_CANCEL);

sub ZERO { 0 }
sub ONE  { 1 }

{
    my $selection = wxID_NO;

    print "selection is $selection\n";
    print 'wxID_YES is ', wxID_YES(), "\n";

    given ($selection)
    {
        when (ZERO)        { print qq[Zero\n]                  }
        when (ONE)         { print qq[One\n]                   }
        when (wxID_YES)    { print qq[You pressed: "Yes"\n]    }
        when (wxID_NO)     { print qq[You pressed: "No"\n]     }
        when (wxID_CANCEL) { print qq[You pressed: "Cancel"\n] }
        default            { print qq[Invalid selection\n]     }
    }
}