#1: how to check null value
Posted on 2008-04-22 10:09:19 by Irfan.Sayed
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Hi All,
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How to find out whether the string contains null values or empty data.
=20
For example : I have one scalar variable $str and now I want to check
whether it contains any data or not.
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What I did : If ($str eq "NULL" || $str eq " "){ print $str conatins
nothing\n";}
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Is this correct?? Because doing as per above code , I am not getting
proper result.
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Please help
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Regards,
Irfan
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#2: Re: how to check null value
Posted on 2008-04-22 11:54:16 by igotux igotux
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perldoc -f defined should answer your question.
On Tue, Apr 22, 2008 at 1:39 PM, <Irfan.Sayed@t-systems.com> wrote:
> Hi All,
>
>
>
> How to find out whether the string contains null values or empty data.
>
>
>
> For example : I have one scalar variable $str and now I want to check
> whether it contains any data or not.
>
>
>
> What I did : If ($str eq "NULL" || $str eq " "){ print $str conatins
> nothing\n";}
>
>
>
> Is this correct?? Because doing as per above code , I am not getting
> proper result.
>
>
>
> Please help
>
>
>
> Regards,
>
> Irfan
>
>
>
>
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#3: Re: how to check null value
Posted on 2008-04-22 12:02:02 by Lars Haugseth
* Irfan.Sayed@t-systems.com wrote:
>
> How to find out whether the string contains null values or empty data.
>
> For example : I have one scalar variable $str and now I want to check
> whether it contains any data or not.
>
> What I did : If ($str eq "NULL" || $str eq " "){ print $str conatins
> nothing\n";}
Try this:
if (!defined $str || $str eq "") { ... }
Almost but not quite the same:
if (!$str) { ... }
Here the block will also be executed if the value of $str is 0.
--
Lars Haugseth
"If anyone disagrees with anything I say, I am quite prepared not only to
retract it, but also to deny under oath that I ever said it." -Tom Lehrer
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