Perl之冒泡排序法

#! /usr/bin/perl -w

use strict;

my @list = qw /3 5 6 2 12/;
bubble_sort(\@list,scalar @list);
print "@list\n";

sub bubble_sort {
    my $arrays_ref = shift || ""; 
    my $num = shift || ""; 

    for (my $i = 0; $i < $num - 1; $i++) {
        for (my $j = 0; $j < $num - $i - 1; $j++) {
            if ($arrays_ref->[$j] > $arrays_ref->[$j-1]) {
                my $tmp = $arrays_ref->[$j];
                $arrays_ref->[$j] = $arrays_ref->[$j-1];
                $arrays_ref->[$j-1] = $tmp;
            }   
            print "@$arrays_ref\n";
        }   
    }   
    return $arrays_ref;
}