print "--------Trying with arrays-------\n";
my @a = (0, 1, 2, 3);
my $ar = \@a;       # Array reference
my $air = \$a[0]; # Reference to member of an array

print "Define array >@a<\nCreate a reference to \$a[0]\n";
print "array ref: >@$ar< \n";
print "array index ref: >$$air<\n";

@a = ('a','b','c');
print "Change array to >@a<\n";
print "array ref: >@$ar< \n";
print "array index ref: >$$air<\n";   # <--- I'd like to get "a" here

print "--------Trying with strings-------\n";
my $s = "string";
my $sr = \$s;

print "orignal: >$s<\n";
print "reference: >$$sr<\n";

$s = "changed string";

print "string: >$s<\n";
print "string reference: >$$sr<\n";