Re: What is $#

This variable returns the number of array elements in @_ - For example:

#!/usr/bin/perl -Tw

use strict;

my @array = (1..5);

#   Pass @array to the &count subroutine and print returned result
#
print "There are ", &count(@array), " elements in \@array.\n";


sub count {

    #   The arguments are passed to &count and are in @_
    #
    return $#_ + 1;
};
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Ooohhh, Rob no beer function well without!

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Re: Re: What is $#_ ? by davorg (Chancellor) on Nov 16, 2001 at 14:07 UTC
This variable returns the number of array elements in @_ <pedant> Not exactly. `$#_` contains the index of the last element in `@_`. This is actually one less than the number of elements in `@_` (assuming that you haven't messed with the value of `$[` - which you should never do[1]). </pedant> [1] In fact, please forget[2] I ever mentioned that you can. [2] Please look into the red light FLASH -- <http://www.dave.org.uk> "The first rule of Perl club is you don't talk about Perl club."	[reply]

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Re: Re: What is $#_ ?
by davorg (Chancellor) on Nov 16, 2001 at 14:07 UTC

This variable returns the number of array elements in @_

<pedant>
Not exactly. $#_ contains the index of the last element in @_. This is actually one less than the number of elements in @_ (assuming that you haven't messed with the value of $[ - which you should never do[1]).
</pedant>

[1] In fact, please forget[2] I ever mentioned that you can.
[2] Please look into the red light *FLASH*

http://www.dave.org.uk

"The first rule of Perl club is you don't talk about Perl club."

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