PERL, push to hash of array problem


 
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# 1  
Old 05-06-2009
PERL, push to hash of array problem

Code:
 
$key = "a";
$value = "hello";
%myhash = {} ;
push @{ myHash{$key} }, $hello;
 
print $myHash{$key}[0]."\n";

this script prints
"hello" but has following error message.

Code:
Reference found where even-sized list expected at ./test line 5.

can any one help me to fix this problem??
# 2  
Old 05-06-2009
You're trying to assign a reference to a hash to a hash variable itself. Try it as
Code:
%myhash = ();

That, and the push line should rather be written as
Code:
push @{ $myHash{$key} }, $hello;

# 3  
Old 05-06-2009
You're trying to assign a reference to a hash to a hash variable itself. Try it as
Code:
%myhash = ();

That, and the push line should rather be written as
Code:
push @{ $myHash{$key} }, $hello;

# 4  
Old 05-06-2009
You can't use a hash slice in a push

First off you don't have $hello set to anything, you have $value = "hello" -- not the same.

You should:

use strict;
use warnings;

and all would be reveled.

try:

Code:
use strict;
use warnings;

my $key = "a";
my $value = "hello";
my %myhash;

push @{ $myhash{$key} }, $value;

print "$myhash{$key}[0]\n"

also see: perldoc perldsc

Last edited by sweetblood; 05-06-2009 at 02:32 PM.. Reason: Added code tags
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