Samy_rio has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks, I will try to use 'OUTPUT_FIELD_SEPARATOR' in different ways. Now I am facing problem, that is 'OUTPUT_FIELD_SEPARATOR' is not working inside Double quotes.

Sample code:

@files=('apple','ball','cat','dance');
$,="\n";
###Below line OUTPUT_FIELD_SEPARATOR is working
print "\nArray Elements in Outoff Double Quotes :", @files;

###Below line OUTPUT_FIELD_SEPARATOR isnot working
print "\nArray Elements within Double Quotes :\n@files";

[download]

I know this question is silly, but I need to know the fact.

Thanks in advance.

Regards,
Velusamy R.

Replies are listed 'Best First'.
Re: Problem in OUTPUT_FIELD_SEPARATOR
by poj (Abbot) on Aug 27, 2005 at 08:04 UTC
    Another variable needs to be set 
    $LIST_SEPARATOR
$"
    This is like $, except that it applies to array and 
slice values interpolated into a double-quoted string (
or similar interpreted string). Default is a space.

    [download]
    poj
[reply]
[d/l]
Re: Problem in OUTPUT_FIELD_SEPARATOR
by BrowserUk (Patriarch) on Aug 27, 2005 at 08:04 UTC

    $OUTPUT_FIELD_SEPARATOR only operates on comma separated fields, not arrays interpolated within double quotes. For that, you need to use $LIST_SEPARATOR. 

    $" = "\n"; ## This may do what you intended.
print "\nArray Elements within Double Quotes :\n@files";

    [download]
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[reply]
[d/l]

      Thank you for your replies. But I have one more question is "For What reason Variable Interpolation is not working in second print statement in my code".

      Regards,
      Velusamy R.

[reply]
        Is working the it is supposed to work - perlvar:
        "$, The output field separator for the print operator.
        Ordinarily the print operator simply prints out its arguments without further adornment."        . 
        ...
print "\nArray Elements within Double Quotes :\n", @files;
...
output:

Array Elements within Double Quotes :

apple
ball
cat

        [download]


[reply]
[d/l]
Re: Problem in OUTPUT_FIELD_SEPARATOR
by spiritway (Vicar) on Aug 27, 2005 at 08:02 UTC

    I don't think it's a silly question. I suspect (though I don't know for certain) that in the context of a double quote, the @files array isn't considered a set of fields, and so is printed as a straight array. I could see there being a distinction made between data outside the quotes, and inside. I don't know whether this is a feature, though.

[reply]

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