The following command line will give you the text:
C:\>perldoc perlop
I have pasted here the relevant section for you :
<snip>
Conditional Operator
Ternary "?:" is the conditional operator, just as in C. It works much
like an if-then-else. If the argument before the ? is true, the argument
before the : is returned, otherwise the argument after the : is
returned. For example:
printf "I have %d dog%s.\n", $n,
($n == 1) ? '' : "s";
Scalar or list context propagates downward into the 2nd or 3rd argument,
whichever is selected.
$a = $ok ? $b : $c; # get a scalar
@a = $ok ? @b : @c; # get an array
$a = $ok ? @b : @c; # oops, that's just a count!
The operator may be assigned to if both the 2nd and 3rd arguments are
legal lvalues (meaning that you can assign to them):
($a_or_b ? $a : $b) = $c;
Because this operator produces an assignable result, using assignments
without parentheses will get you in trouble. For example, this:
$a % 2 ? $a += 10 : $a += 2
Really means this:
(($a % 2) ? ($a += 10) : $a) += 2
Rather than this:
($a % 2) ? ($a += 10) : ($a += 2)
That should probably be written more simply as:
$a += ($a % 2) ? 10 : 2;
<\snip>
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 30, 2003 5:12 PM
To: NYIMI Jose (BMB)
Subject: RE: ? thinger
I don't have external internet access, so could you paste that page into an email, or
save it as an attachment? TIA!
Brian
-----Original Message-----
From: NYIMI Jose (BMB) [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 30, 2003 9:11 AM
To: bseel [CONTRACTOR]; [EMAIL PROTECTED]
Subject: RE: ? thinger
Have a look to this :
http://www.perldoc.com/perl5.8.0/pod/perlop.html#Conditional-Operator
HTH,
José.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 30, 2003 5:06 PM
To: [EMAIL PROTECTED]
Subject: ? thinger
I have been noticing the ? used quite a bit, and I don't know what it does. I know in
regular expressions it means "0 or 1" but what about in a time like:
for my $op ( "and", "or ", "xor" ) {
print "0 $op 0 ", eval "0 $op 0" ? "TRUE" : "FALSE";
print "0 $op 1 ", eval "0 $op 1" ? "TRUE" : "FALSE";
print "1 $op 0 ", eval "1 $op 0" ? "TRUE" : "FALSE";
print "1 $op 1 ", eval "1 $op 1" ? "TRUE" : "FALSE";
}
or
my @keys = ($orderRef)?(@$orderRef):(keys %$hashRef);
TIA
Brian Seel
High School Intern
Micron Technology
[EMAIL PROTECTED]
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