How do I distinguish between no value and false? I thought defined was supposed to do that.
So if I call $q->param("xyz"), how do I distinguish between &xyz=0&abc and &xyz=&abc and xyz being absent all together? -----Original Message----- From: Babale Fongo [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 04, 2005 12:48 PM To: beginners@perl.org Subject: RE: How does defined work? Both Zero "0" and empty string " " are defined values in Perl, so if you want to test for values other than zero or empty string; then try something like thing: if ($nUserId) { # so "0", 0 or " " will fail here $juror_number = $nUserId; } else { die "No valid ID for User"; } ||-----Original Message----- ||From: Siegfried Heintze [mailto:[EMAIL PROTECTED] ||Sent: Monday, January 03, 2005 6:58 AM ||To: beginners@perl.org ||Subject: How does defined work? || ||I am posting this query in beginners instead of beginners-cgi because I ||believe this is a question about the defined statement and not the $q->param ||statement/function. || ||I'm using this code: ||$q = new CGI; ||my $nUserId = $q->param("userId") ; || ||I was hoping the defined keyword would tell me if userId was present, but it ||does not seem to be doing that. || ||How can I make this execute the die statement when userId is missing from my ||get/post parameters? || || if (defined $nUserId) { || $juror_number = $nUserId; || } else { || die "No valid ID for User"; || } || ||Thanks, ||Siegfried || || ||-- ||To unsubscribe, e-mail: [EMAIL PROTECTED] ||For additional commands, e-mail: [EMAIL PROTECTED] ||<http://learn.perl.org/> <http://learn.perl.org/first-response> -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response> -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response>