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Re: Comparing two directories and then exiting from the script

by biohisham (Priest)
on Nov 20, 2010 at 03:22 UTC ( #872624=note: print w/replies, xml ) Need Help??

in reply to Comparing two directories and then exiting from the script

Argument "E:/perl/scripts" isn't numeric in numeric ne (!=) at line 26
Of course this argument is not numeric because "E:/perl/scripts" is not a number, hence you were offered the operator 'ne' instead of the one you tried to use '!='.

You have to decide whether your operand(s) is in numeric context or a string context. In Perl it makes a difference and using an operator in a context that is it not applicable could give out such warnings.

'lt, gt, le, ge, eq, ne, cmp' perform on strings similar operations performed by '<, >, <=, >=, ==, !=, <=>' respectively on numbers

On a further note, be careful with treating strings as numbers because perl can force into a number any string that has been treated that way, an example will include using the arithmetic operators on strings, they will be reinitialized to zero..
my $string = "lion"; my $result = $string + 2; print $result;
'$string' was reinitialized to 0... These are some errors that may just be hard to detect if you chose to ignore warnings given to you..

Excellence is an Endeavor of Persistence. A Year-Old Monk :D .

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[Corion]: Heh - a good talk on Youtube about why you want to keep your Genome as secret as possible (and not use it for vanity stuff like 23andme , or some ancestry stuff)

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