> > Zeng Nan [ZN], on Thursday, November 18, 2004 at 13:43 > (+0800) wrote > > these comments: > > > > ZN> As said in "Learning Perl", a perl identifier is "a letter or > > ZN> underscore, and then possibly more letters, or digits, or > underscores". > > ZN> Because of this, $123 is an invalid name, but why $000 > or $000000 > works?
I tried the following code: #!/usr/bin/perl use warnings; use strict; my $00 = "Two Zeros"; my $000 = "Three Zeros"; my $0000 = "Four Zeros"; print "\$0 = $0\n"; print "\$00 = $00\n"; print "\$000 = $000\n"; print "\$0000 = $0000\n"; And I got the following output: Can't use global $00 in "my" at ./zerotest line 6, near "my $00 " Can't use global $000 in "my" at ./zerotest line 7, near "my $000 " Can't use global $0000 in "my" at ./zerotest line 8, near "my $0000 " Execution of ./zerotest aborted due to compilation errors. BUT ... When I removed the "warnings" and "strict", and stopped using "my", it works: #!/usr/bin/perl $00 = "Two Zeros"; $000 = "Three Zeros"; $0000 = "Four Zeros"; print "\$0 = $0\n"; print "\$00 = $00\n"; print "\$000 = $000\n"; print "\$0000 = $0000\n"; The above code produced the following output: $0 = ./zerotest $00 = Two Zeros $000 = Three Zeros $0000 = Four Zeros So ... Um, weird! --Errin -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response>
