On 23/06/2011 10:36, Irfan Sayed wrote:
> Hi,
>
> i need to sort hash in descending order.
> but the issue is , in hash, i have key as integer value and the value
> associated with that key is string
>
> so when i do sort it does not really sort the hash on the key level
>
>
> i used follwoing code
>
> foreach my $key (sort { $hash_fin{$b}<=> $hash_fin{$a} } keys %hash_fin) {
> print "$key => $hash_fin{$key}\n";
>
> }
>
> the unsorted hash is :
> 12 => 20110622-035007-134
> 131 => 20110622-002139-131
> 107 => 20110621-215838-127
> 13 => 20110622-035007-134
> 129 => 20110621-235900-129
It looks like you want to sort the hash elements by value?
For string data you must use the string comparator 'cmp' instead of the
numeric comparator. Take a look at the program below.
HTH,
Rob
use strict;
use warnings;
my %hash_fin = (
12 => '20110622-035007-134',
131 => '20110622-002139-131',
107 => '20110621-215838-127',
13 => '20110622-035007-134',
129 => '20110621-235900-129',
);
foreach my $key (sort { $hash_fin{$b} cmp $hash_fin{$a} } keys %hash_fin) {
printf "%-3d => '%s'\n", $key, $hash_fin{$key};
}
**OUTPUT**
13 => '20110622-035007-134'
12 => '20110622-035007-134'
131 => '20110622-002139-131'
129 => '20110621-235900-129'
107 => '20110621-215838-127'
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