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about $_

kevindai
Novice

May 26, 2009, 11:34 AM

Post #1 of 4 (282 views)

about $_	Can't Post

I am trying to pass argument to a function. and within function I want to use the passed argument.
eg:
somefunc()
{
&calculate($value);
}

sub calculate()
{
my $temp = $_;
# do calculation using the value passed from above and return
}
My question is .....Do i have to declare "$_"? or how do i do this
have perl warnings On.

In Reply To

Quote

1arryb
User

May 26, 2009, 1:26 PM

Post #2 of 4 (280 views)

Re: [kevindai] about $_ [In reply to]	Can't Post

Hi kevin,

Function arguments are passed as an array, not a scalar. Try:

Code

my $temp = $_[0];

Or, more idiomatically:

Code

my $temp = shift;

Also, your program won't compile, as written. Subroutine definitions don't take '()' after the subroutine name.

Cheers,

Larry

FishMonger
Veteran

May 26, 2009, 3:38 PM

Post #3 of 4 (278 views)

Re: [1arryb] about $_ [In reply to]	Can't Post

Quote

Subroutine definitions don't take '()' after the subroutine name.

Yes they do...that's a prototype definition, which you almost never want to use, and definitely not the way they're being used here.

http://www.perl.com/doc/manual/html/pod/perlsub.html

kevindai
Novice

May 26, 2009, 10:19 PM

Post #4 of 4 (273 views)

Re: [FishMonger] about $_ [In reply to]	Can't Post

Thank you! Larry and FishMonger!

(This post was edited by kevindai on May 26, 2009, 10:20 PM)

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