使用两个元素在perl中创建哈希

Question

How do you write the following in Perl(provide exact Perl syntax): a) create hash "days_in_month" (hash variable name is "days_in_month") with two elements. First element with key "July" and value 31, second element with key "September" and value 30. Get hash element by key "September" and print its value (provide exact Perl syntax). What value should you get?

Would it be like this ?

       my %days_in_month = (
          'July' => '31',
          'September' => '30',
           );

       my $dayvalue = $days_in_month{September};
       print $dayvalue; 

Answer 1

Yes, but you don't need to quote the key, and you really shouldn't quote numbers used as numbers.

my %days_in_month = (
          July => 31,
          September => 30,
           );

This is equivalent to the following code:

my %days_in_month = ('July' => 31,'September' => 30);