#!/usr/local/bin/perl
use strict;
use warnings;

my $array_ref = [1, 2, 3, 4];
my $hash_ref = { a => 1, b => 2 };
print $array_ref;
print $hash_ref;

my @a = @{ $array_ref };
my %a = %{ $hash_ref };

print @a;
print %a;

my @arr = (9,8,7,6);
print @arr;

# (1)引数に渡す値
my $num1 = 1;
my $num2 = 2;

# (2)サブルーチンの呼び出し
my $total = total($num1, $num2);

# (3)サブルーチンの定義
sub total {
  my ($num1, $num2) = @_;

  my $total = $num1 + $num2;

  return $total;
}