Creating an Array: Difference between revisions

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{{task}}
{{DeprecatedTask}}
'''Please do not add new code, and merge existing code to the [[Arrays]] task.'''
''This task is about [[numeric arrays]]. For '''hashes''' or '''associative arrays''', please see [[Creating an Associative Array]].''


This task is about numerically-indexed arrays. For '''hashes''' or '''associative arrays''', please see [[Creating an Associative Array]].
{{Clarify task}}


In this task, the goal is to create an [[array]].
In this task, the goal is to create an [[array]]. Mention if the [[array base]] begins at a number other than zero.
In addition, demonstrate how to initialize an array variable with data.

==[[Ada]]==
[[Category:Ada]]
'''Compiler:''' GCC 4.1.2
type Arr is array (Positive range <>) of Integer;
Uninitialized : Arr (1 .. 10);
Initialized_1 : Arr (1 .. 20) := (others => 1);
Initialized_2 : Arr := (1 .. 30 => 2);
Const : constant Arr := (1 .. 10 => 1, 11 .. 20 => 2, 21 | 22 => 3);

{{array operation}}

==[[AppleScript]]==
[[Category:AppleScript]]
AppleScript supports "arrays" as "lists," and they are not limited by a single type.
set array1 to {}
set array2 to {1, 2, 3, 4, 'a', 'b', "hello", "world"}

==[[BASIC]]==
[[Category:BASIC]]
'''Interpeter:''' [[QuickBasic]] 4.5, PB 7.1

' $DYNAMIC
DIM SHARED myArray(-10 TO 10, 10 TO 30) AS STRING
REDIM SHARED myArray(20, 20) AS STRING
myArray(1,1) = "Item1"
myArray(1,2) = "Item2"

==[[C]]==
[[Category:C]]
'''Compiler:''' GCC, MSVC, BCC, Watcom

'''Libraries:''' [[None are needed]]
// Dynamic
int n = 10 * sizeof(int);
int *myArray = (int*)malloc(n);
if(myArray != NULL)
{
memset(myArray, 0, n);
myArray[0] = 1;
myArray[1] = 2;
free(myArray);
myArray = NULL;
}

'''Libraries:''' [[None are needed]]
// Static
int myArray2[10] = { 1, 2, 0}; /* 3..9 := 0 */

==[[C plus plus|C++]]==
[[Category:C plus plus]]
'''Compiler:''' [[GCC]], [[Visual C plus plus|Visual C++]], [[BCC]], [[Watcom]]


// Dynamic
const int n = 10;
int* myArray = new int[n];
if(myArray != NULL)
{
myArray[0] = 1;
myArray[1] = 2;
delete[] myArray;
myArray = NULL;
}

// Static
int myArray2[10] = { 1, 2, 0}; /* 3..9 := 0 */

'''Libraries:''' [[STL]]
// STL
std::vector<int> myArray3(10);
myArray3.push_back(1);
myArray3.push_back(2);

'''Libraries:''' [[Qt]]
// Qt
QVector<int> myArray4(10);
myArray4.push_back(1);
myArray4.push_back(2);

'''Libraries:''' [[Microsoft Foundation Classes]]
// MFC
CArray<int,int> myArray5(10);
myArray5.Add(1);
myArray5.Add(2);

==[[C sharp|C#]]==
[[Category:C sharp]]
Example of array of 10 int types:

int[] numbers = new int[10];

Example of array of 3 string types:

string[] words = { "these", "are", "arrays" };

You can also declare the size of the array and initialize the values at the same time:

int[] more_numbers = new int[3]{ 21, 14 ,63 };


For Multi-Deminsional arrays you delcare them the same except for a comma in the type declaration.

The following creates a 3x2 int matrix
int[,] number_matrix = new int[3][2];

As with the previous examples you can also initialize the values of the array, the only difference being each row in the matrix must be enclosed in its own braces.

string[,] string_matrix = { {"I","swam"}, {"in","the"}, {"freezing","water"} };

or

string[,] funny_matrix = new string[2][2]{ {"clowns", "are"} , {"not", "funny"} };

==[[Perl]]==
[[Category:Perl]]
'''Interpeter:''' [[Perl]]

use vars qw{ @Array };

@Array=(
[0,0,0,0,0,0],
[1,1,1,1,1,1],
[2,2,2,2,2,2],
[3,3,3,3,3,3]
);
#You would call the array by this code. This will call the 3rd 1 on the second list
print $Array[1][3];

# Alternative:
my @array_using_qw = qw/coffee sugar cream/;

# Alternative:
my @Array3 = ();
push @Array3, "Item1";
push @Array3, "Item2";
$Array3[2] = "Item3";
$Array3[3][0] = "Item4";

@Array = ('This', 'That', 'And', 'The', 'Other');

$ArrayRef = ['This', 'That', 'And', 'The', 'Other'];
print $ArrayRef->[2]; # would print "And"

==[[PHP]]==
[[Category:PHP]]
For a single dimension array with 10 elements:
$array = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) //$array[3] == 3
$array = array("a", "b", "c", "d", "e", "f", "g", "h", "i", "j") //$array[3] == "c"

For a multi-dimension array:
$array = array(
array(0, 0, 0, 0, 0, 0),
array(1, 1, 1, 1, 1, 1),
array(2, 2, 2, 2, 2, 2),
array(3, 3, 3, 3, 3, 3)
);
#You would call the array by this code. This will call the 3rd 1 on the second list
echo $array[1][3];

==[[Python]]==
[[Category:Python]]
'''Interpeter:''' Python 2.3, 2.4, 2.5
'''Libraries:''' [[None are needed]]
Array=[
[0,0,0,0,0,0],
[1,1,1,1,1,1],
[2,2,2,2,2,2],
[3,3,3,3,3,3]
]
#You would call the array by this code. This will call the 3rd 1 on the second list
Array[1][3]

Alternatively you can create it programmatically with a list comprehension:

Array = [ [i]*6 for i in range(4) ]

Create an empty array:

Array = []

==[[Ruby]]==
[[Category:Ruby]]
my_array = Array.new
# This is the most basic way to create an empty one-dimensional array in Ruby.

my_array = 1, 2, 3, 4, 5
# Ruby treats comma separated values on the right hand side of assignment as array. You could optionally surround the list with square bracks
# my_array = [ 1, 2, 3, 4, 5 ]

array = [
[0, 0, 0, 0, 0, 0],
[1, 1, 1, 1, 1, 1],
[2, 2, 2, 2, 2, 2],
[3, 3, 3, 3, 3, 3]
]
# You would call the array by this code. This will call the 3rd 1 on the second list
array[1][3]

# You can also create a sequential array from a range using the 'splat' operator:
array = [*0..3]
# or use the .to_a method for Ranges
array = (0..3).to_a
#=> [0,1,2,3]
# This lets us create the above programmatically:
array = [*0..3].map {|i| [i] * 6}
# or use the .map (.collect which is the same) method for Ranges directly
# note also that arrays of length 6 with a default element are created using Array.new
array = (0..3).map {|i| Array.new(6,i)}
#=> [[0, 0, 0, 0, 0, 0], [1, 1, 1, 1, 1, 1], [2, 2, 2, 2, 2, 2], [3, 3, 3, 3, 3, 3]]

==[[Java]]==
[[Category:Java]]
For example for an array of 10 int values:
int[] intArray = new int[10];

Creating an array of Strings:

String[] s = {"hello" , "World" };

==[[JavaScript]]==
[[Category:JavaScript]]
var myArray = new Array();
var myArray2 = new Array("Item1","Item2");
var myArray3 = ["Item1", "Item2"];

==[[3DS Max 8 - MaxScript]]==
[[Category:MaxScript]]
myArray = #()
myArray2 = #("Item1", "Item2")

==[[mIRC]]==
[[Category:mIRC]]
'''Interpeter:''' mIRC Script Editor
'''Libraries:''' [[mArray Snippet]]
alias creatmearray { .echo -a $array_create(MyArray, 5, 10) }

==[[OCaml]]==
[[Category:OCaml]]
Using an array literal:

let array = [| 1; 2; 3; 4; 5 |];;

To create an array of five elements with the value 0:

let num_items = 5 and initial_value = 0;;
let array = Array.make num_items initial_value

To create an array with contents defined by passing each index to a callback (in this example, the array is set to the squares of the numbers 0 through 4):

let callback index = index * index;;
let array = Array.init 5 callback

==[[SmallTalk]]==
[[Category:SmallTalk]]
array := Array withAll: #('an' 'apple' 'a' 'day' 'keeps' 'the' 'doctor' 'away').

"Access the first element of the array"
elem := array at: 1.

"Replace apple with orange"
array at: 2 put: 'orange'.

==[[Visual Basic .Net]]==
[[Category:Visual Basic]]
'''Compiler:''' [[Visual Studio .NET]] 2005
Dim myArray() as String = New String() {"Hello", "World", "!"}

Latest revision as of 15:07, 29 November 2019

Creating an Array was a programming task. It has been deprecated for reasons that are discussed in its talk page.

Please do not add new code, and merge existing code to the Arrays task.

This task is about numerically-indexed arrays. For hashes or associative arrays, please see Creating an Associative Array.

In this task, the goal is to create an array. Mention if the array base begins at a number other than zero. In addition, demonstrate how to initialize an array variable with data.

Retrieved from "https://rosettacode.org/wiki/Creating_an_Array?oldid=6178"