Jos,
Thanks for the explanation.
Thanks,
Sudarsan
"Jos I. Boumans" wrote:
> it's quite simple
>
> while, for, etc are operators in a way
> they do something with whathever you give them
>
> for, for example, assigns every every element of a list to $_
> unless you specify differently
>
> so what you're doing with this:
>
> <STDIN>
> if (/foo/) { print "found foo" }
>
> is the same as saying:
>
> 'some string'
> if (/foo/) { print "found foo" }
>
> this will not assign 'some string' to $_
> actually, perl will thro you a warning like:
> useless use of constant in void context at bla bla line x
>
> sorry if i'm not speaking totally coherent, it's a bit late here =)
> but in short:
> you cant *just* put stuff somewhere and expect it to land in $_
> many operators will take $_ as default operand or input, but a filehandle is
> not an operator
>
> hth
> Jos Boumans
>
> > Maybe the code piece in my mail is misleading. My question is why does the
> input from
> > STDIN assigned to $_ when given within a loop
> > construct and not when given stand alone.
> >
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