What are the basic data types of Perl

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Basic data types:

Scalar, array, hash, function

$, @,%, &

Scalar, indicator: $

My $aim

$aim = 10000000000; # Integer

My $act = 1.5; # floating point number

$act = 1.5eCo10; # floating point number

My $gain = "4jue 5000w"; # string

$gain = 'Novo gene'; # string

My $reality = undef; # is equivalent to my $reality

Single and double quotation marks:

My $pay = 6000

Print "The pay is $pay\ n"

# display: The pay is 6000

Print 'The pay is $pay\ n'

# display: The pay is $pay\ n

Print "The pay is\ $$pay\ n"; # use "\"

# display: The pay is $6000

"\ n" line break; "\ t" tab

Array, indicator: @

My @ array = (1, 2, 3, 4)

@ array= (1.. 4)

Print "@ array\ n"; # shows: 1 2 3 4

Print the first element of the array array:

Print "$array [0]\ n"; # shows: 1, the array index number starts at 0

Assign the last element of the array to 10:

$array [- 1] = 10; # @ array: (1, 2, 3, 10)

My @ array2 = ("a", "b", "c", 1, 2)

@ array2= qw (a b c 1 2)

Hash (hash, associative array), indicator:%

Characteristics: key (key) = > value (value); key and value correspond one to one

My hash

% hash = (a = > 1, b = > 2, c = > 3)

Print $hash {a}; # shows: 1

Print "b = > $hash {b}\ n"; # shows: B = > 2

% hash = ('averse, 1,' baked, 2, 'cached, 3)

$hash {d} = 1

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