Re: scalar values assignment

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Re^2: scalar values assignment by sierpinski (Chaplain) on Apr 09, 2010 at 13:02 UTC
That's true in most languages, if you're comparing whether or not a value is true or false, you don't have to explicitly add ' = true'. If you're unfamiliar with this concept, and how conditionals work, I'd strong recommend looking into general programming concepts. Not necessarily Perl, although if you're programming in Perl it would be a good place to start. Learning these basic concepts will help you pick up any programming language in the future. The concepts don't change, but the syntax does, and that's just a matter of googling and forums.	[reply]
Re^2: scalar values assignment by gogoglou (Beadle) on Apr 09, 2010 at 13:00 UTC
I've read perlintro, and i've tried something like `if ($scalar1! && $scalar2!){ then.... }` [download] still this didn't work. I also don't understand what you mean that I don't have to compare booleans to true or false. I am sorry if my questions seem a bit stupid and thank you for your time to reply to me.	[reply] [d/l]
Re^3: scalar values assignment by moritz (Cardinal) on Apr 09, 2010 at 13:12 UTC
perlintro doesn't mention a `then` belonging to an `if`, because Perl is not Visual Basic. Just write `if (defined(param('foo'))) { print "yes, we have a foo\n"; } else { print "out of luck, pal\n"; }` [download] I also don't understand what you mean that I don't have to compare booleans to true or false. The question `is $thing the same as true?` is nearly the same as `is $thing true?`. When you write `if ($thing) { ... }` then perl already asks `is $thing true?` - no need to make it more complicated by explcitly comparing it to `true` (which doesn't exist in Perl 5 anyway).	[reply] [d/l] [select]
Re^3: scalar values assignment by Anonymous Monk on Apr 09, 2010 at 13:10 UTC
The actual error message should be telling you where to look. Were you trying to form a NAND operator? `!&&` isn't legit. Also, the not operator (`!`) needs something to negate at the end of your conditional.	[reply] [d/l] [select]