perl - 为什么 'say "%hash"' 的工作方式与它对标量和数组的工作方式不同？

Question

为什么“say "%hash"”的工作方式与它对标量和数组的工作方式不同？

#!/usr/bin/perl
use strict;
use warnings;
use Modern::Perl;
use Test::More;

my $s = "Hello, World!";
say $s;
say "$s";

my @a = ("Hello", "World!");
say @a;
say "@a";

my %h = ("Hello", "World!");
say %h;
say "%h";

D:\TEST\perl>perl 1.pl
Hello, World!
Hello, World!
HelloWorld!
Hello World!
HelloWorld!
%h

Answer 1

因为它会搞砸 printf 语法？

%d = ('key' => 'value');
printf "The answer is %d\n", 4;    # is %d a format symbol or the hash table?