Re: [Omaha.pm] Test Questions

[<oak83@cox.net>]

Thanks Dan,

Have not done any Perl since Creighton 10 years ago. Had a 36 question test and I was not sure on these. I have my framework code done to do the parsing I need at work. I had to beg to get an account on a test Suse 9 server. 

At my last job I had Active State and Cygwin configured pretty good but the new job is a crappy Windows shop. Too many huge databases that need to be cubed.

Take Care,

Tom


---- Dan Linder <dan@linder.org> wrote: 
> I'll take a stab...though this really sounds like test questions copied
> verbatim... :-\
> 
> On Fri, Jan 2, 2009 at 8:35 PM, <oak83@cox.net> wrote:
> 
> > Gents, I need some clarification on these if you do not mind? I am shaky on
> > these. I will try to write these and see what happens. Any input is greatly
> > appreciated.
> >
> > What is the value of the expression length(1+2+3) ?  5 or 6 or Am I off
> > base?
> >
> 
> When I ran this snippet of code:
>      printf ("len:%i\n", length(1+2+3));
> 
> I got back "1".  That sounds right since the perldoc.perl.org site says that
> length "returns the length in *characters* of the value of EXPR"  Thus, the
> math is done first (1+2+3) and results in 6.  That value is then converted
> to a string ("6"), which has a length of 1.
> 
> 
> > The expression $a = $b++ * ++$c has the same effect on $a, $b, and $c as
> > which of the following? Think it is the 2nd one?
> >
> > $a = $b * $c;
> >
> > $a = ($b + 1) * ($c + 1);
> >
> > $c = $c + 1; $a = $b * $c; $b = $b + 1;
> >
> > $a = $b * ($c + 1);
> >
> 
> I had to double check the Perl.com perlop reference (
> http://www.perl.com/doc/manual/html/pod/perlop.html), but the C precedence I
> remembered from CS many years ago still holds.
> 
> Since "$b++" means "increment the $b variable AFTER returning it's current
> value to the expression using it", and "++$c" means "increment $c and return
> the new value to the expression."  Since the ++ are tightly bound to the
> variable, the multiply doesn't affect the overall value, so the third
> example:
>      $c = $c + 1; $a = $b * $c; $b = $b + 1;
> Is a different way to write it.
> 
> 
> > When is this logical expression true: lc($a) eq $a ?   Think it is the 3rd
> > one?
> >
> > Never
> >
> > Always
> >
> > When $a contains no uppercase letters
> >
> > When $a contains no lowercase letters
> 
> 
> The third one.
> 
> I think that's enough for now.   I didn't see you have submitted a dozen
> questions...  My initial instinct that these are test questions is feeling
> more certain.
> 
> If this was some sort of a take-home test, how hard would it be to write a
> small bit of code to test each one if you're not 100% sure? (That's what I
> did on the $b++ * ++$c question...)
> 
> If this isn't a test, why not point us toward the source code you're
> debugging and it might make more sense.
> 
> Dan
> 
> -- 
> "Quis custodiet ipsos custodes?" (Who can watch the watchmen?) -- from the
> Satires of Juvenal
> "I do not fear computers, I fear the lack of them." -- Isaac Asimov (Author)
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