Perl Learning Note Two

Array:

Special array index: Adds an assignment to an element whose index value exceeds the end of the array, which is automatically expanded as needed as long as there is available memory allocated to the array. The value of an unexpectedly increasing array element is undef.

$a [0]= "AA";

$a [1]= "BB";

$a [900]= "99";

Sometimes you need to find the index value of the last element in the array, such as array rocks. The index value of its last element is $ #rocks +1.

can also be accessed using #rokcs[-1].

List Direct Quantity:

QW (quoted word) shorthand

such as: QW (Fred Barney Betty Wilma Dino) = "Fred", "Barney", "Betty", "Wilma", "Dino"

Value of the linked list:

($fred, $barney, $dino) = ("Flintstone", "rubble", undef);

Exchange two values: ($fred, $barney) = ($barney, $fred)

Perl Learning Note Two