I did change it slightly by adding my (couldn't help myself)
user$ cat foo2.pl
my $foo = 23;
my $soft = 'foo'; # soft reference
my $hard = \$foo; # hard reference
print "soft=$$soft, hard=$$hard\n";
user$ perl foo2.pl
soft=, hard=23
user$ perl -v
This is perl 5, version 14, subversion 1 (v5.14.1)
built for darwin-2level
user$ cat foo3.pl
$foo = 23;
$soft = 'foo'; # soft reference
$hard = \$foo; # hard reference
print "soft=$$soft, hard=$$hard\n";
user$ perl foo3.pl
soft=23, hard=23
I think I've learnt something about 'my' too!
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