#! perl
use strict;
use warnings;
use List::Util      'sum0';
use List::MoreUtils 'part';

my @array = @ARGV ? @ARGV : qw( -1 1 7 -4 3 -51 4 47 -87 ); 
   @array = sort { $a <=> $b } @array;
my @part  = part { $_ >=   0 } @array;

printf "Order of array:  %s\n", join ' ', @array;
printf "Sum of all:      %d\n", sum0 @array;
printf "Sum of positive: %d\n", sum0 @{ $part[1] };
printf "Sum of negative: %d\n", sum0 @{ $part[0] };