Guay Jean-SÃbastien wrote: >> Guay Jean-SÃbastien wrote: >>> >>>> open (CRITICALSERVERS, "$crout") || die "can't open file \n: $!"; >>> >>> As I said, you should replace || by or in the above line. See the >>> precedence rules in "perldoc perlop" for details. >> >> why do you think so? is there any problem in the above line? > > There is no problem syntactically. But there is a problem with the > precdence. If you ever have another operation on either the left or right > side of the || operator, the || operator will bind tighter than the other > operation. So for example, if you do: >
sure. i just don't want beginners to think: 'open(H,"F") || die' is wrong. > > my $errors = 0; > open (CRITICALSERVERS, "$crout") || $errors += 2; > > that will translate to: > > my $errors = 0; > ( open (CRITICALSERVERS, "$crout") || $errors ) += 2; > both of your examples above have syntax error so it's not *that* good of an example, perhaps you mean: [panda]# perl -e 'open A,f or die' Died at -e line 1. [panda]# instead of: [panda]# perl -e 'open A,f || die' [panda]# > > Hope this explains this suggestion that might seem, at first, to come out > of the blue! > it does. my main concern is not to confuse beginners who might think a certain construct should never be used. in this example, you sound like 'or' should always be used instead of '||' when checking whether an open success or not. david -- s$s*$+/<tgmecJ"ntgR"tgjvqpC"vuwL$;$;=qq$ \x24\x5f\x3d\x72\x65\x76\x65\x72\x73\x65 \x24\x5f\x3b\x73\x2f\x2e\x2f\x63\x68\x72 \x28\x6f\x72\x64\x28\x24\x26\x29\x2d\x32 \x29\x2f\x67\x65\x3b\x70\x72\x69\x6e\x74 \x22\x24\x5f\x5c\x6e\x22\x3b\x3b$;eval$; -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response>
