number of elements in an array

[oinky]

Hi, I know that if you have an array say @foo, to get the number of elements in that array you can do $#foo.
However, I am having trouble doing this with an array that was passed into a function as a pointer. Something like this:


@foo = ("1","2","3"

sub1(\@foo);


sub sub1
{
my ($foo) = @_;

push @$foo , "4";
print $#foo;

}



It keeps giving me -1 for the length of array.
please help thanks.

 

[raider2001]

The code prints out '3' for me. Note that $#foo is not the number of indexes in the array. It is the last index of array. You can find the size of an array like this;

$size = @$foo;

 

[oinky]

I dont know why but
$size = @$foo does not work for me. when i print $size, its null.

 

[tsdragon]

You could also try:

$size = scalar(@$foo);

Tracy Dryden
tracy@bydisn.com

http://www.bydisn.com

Meddle not in the affairs of dragons,
For you are crunchy, and good with mustard.

 

[Haunter]

The scalar function is one I always forget about, good point tsdragon.

I know it is simple but it works and that is the point.

The @foo start at 0 length and propigates from that point. finding the length is easily done by doing this

$size= $#foo+1;

or

print $#foo+1;

 

[LightElf]

$size = @{ $foo };