Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask
 
PerlMonks  

Re^4: Conditional Operator Confusion

by Melly (Hermit)
on Nov 30, 2006 at 17:03 UTC ( #587012=note: print w/ replies, xml ) Need Help??


in reply to Re^3: Conditional Operator Confusion
in thread Conditional Operator Confusion

Not really... I'm sure I'm being really dumb here, but I still don't understand, in the following example, why $x gets set to "FALSE"... just very, very confused...

1==1?$x='TRUE':$y='FALSE'; print "x=$x\n";
Tom Melly, pm@tomandlu.co.uk


Comment on Re^4: Conditional Operator Confusion
Download Code
Replies are listed 'Best First'.
Re^5: Conditional Operator Confusion
by ikegami (Pope) on Nov 30, 2006 at 17:12 UTC

    The conditional operator has higher precedence than the assignment operator, so
    $c?$x='TRUE':$y='FALSE'
    is the same as
    ($c?$x='TRUE':$y)='FALSE'

    The addition operator has higher precedence than the conditional operator, so
    $c?$x+2:$y+3
    is the same as
    $c?$x+2:($y+3)

    If you want to do assignments, use if or add parens. Think of as the conditional operator as an operator that returns something.

      Thanks - I think I've finally got it (with some help from the chatterbox as well).

      All of which goes to confirm something a coworker once told me..

      Me: What's the precedence in <lang> for these operators?
      CW: Who cares? Use brackets - it's easier to read and
          you won't get screwed...
      
      Tom Melly, pm@tomandlu.co.uk

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://587012]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others rifling through the Monastery: (19)
As of 2015-07-30 21:11 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (273 votes), past polls