I am passing a hash and an array by reference into a sub routine and during test they printed out everything fine but when calling the sub routine and then checking the hash tables, there values never get updated. Can you please explain what I have done wrong in my sub routine? 

sub_info(\%ca, \@ca);

sub_info(\%nv, \@nv);

@keys = ();
@keys = sort { $a cmp $b } (keys %ca);
foreach $key (@keys)
{
    $val = $ca{$key};
    print "$key $val\n";
}
 
@keys = ();
@keys = sort { $a cmp $b } (keys %nv);
foreach $key (@keys)
{
    $val = $nv{$key};
    print "$key $val\n";
}
 
exit 0;

sub upd_info ()
{
    $params1 = shift;
    %paramhash = %$params1;
 
    $params2 = shift;
    @paramarray = @$params2;
 
    while (($key, $val) = each(%paramhash))
    {
        $upd_flg = 0;
        foreach $item (sort { $a cmp $b } @paramarray)
        {
            if ($item =~ /^$key\s+(\w+)$/)
            {
                $upd_flg = $upd_flg + 1;
                $paramhash{$key} .= " $1";
                last;
            }
        }
        if ($upd_flg == 0)
        {
            $paramhash{$key} .= " NONE";
        }
}

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In reply to sub routine trouble by tc1364

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