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Yes.
my $usernamekey='UNIX';
my $passwordvalue='XXXXXX';

my %acct=( $usernamekey => 'boy',
'password' => $passwordvalue );

my @k=keys %acct;
my @v=values %acct;

print "Keys :...

I believe it conforms to C99, but not C89 - you'll get an error if you compile in 89 mode with the -pedantic flag.

I only see cons if you're going to port to a compiler that doesn't support this....