APM: Next dumb Q: IF NULL????
Wayne Walker
wwalker at bybent.com
Tue Oct 17 16:57:21 PDT 2006
if is lower case.
if ( (! defined $product) || ($product == undef))
On Tue, Oct 17, 2006 at 04:51:42PM -0500, CaptNemo wrote:
> Why is it so hard to check for null values in perl!?!?!
>
>
> Two situations:
>
>
> 1) checking is a variable is empty:
>
> IF ($product eq "")...
> IF ($product <> "")...
> IF ($product ne "")...
> IF ($product != "")...
> IF ($product eq NULL)...
> IF ($product <> NULL)...
> IF ($product ne NULL)...
> IF ($product != NULL)...
>
>
> 2) checking to see if command line args were present:
>
> IF ($ARGV[0] eq "")...
> IF ($ARGV[0] <> "")...
> IF ($ARGV[0] ne "")...
> IF ($ARGV[0] != "")...
> IF ($ARGV[0] eq NULL)...
> IF ($ARGV[0] <> NULL)...
> IF ($ARGV[0] ne NULL)...
> IF ($ARGV[0] != NULL)...
>
> ...none seem to work. HOW do you check for NULL values!?!?
>
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--
Wayne Walker
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