Creating an Array: Difference between revisions
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array at: 2 put: 'orange'. |
array at: 2 put: 'orange'. |
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==[[Visual Basic . |
==[[Visual Basic .NET]]== |
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[[Category:Visual Basic]] |
[[Category:Visual Basic .NET]] |
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'''Compiler:''' [[Visual Studio .NET]] 2005 |
'''Compiler:''' [[Visual Studio .NET]] 2005 |
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Dim myArray() as String = New String() {"Hello", "World", "!"} |
Dim myArray() as String = New String() {"Hello", "World", "!"} |
Revision as of 14:28, 29 January 2007
You are encouraged to solve this task according to the task description, using any language you may know.
This task is about numeric arrays. For hashes or associative arrays, please see Creating an Associative Array.
In this task, the goal is to create an array.
ActionScript
// ActionScript arrays are zero-based // // creates an empty array var arr1:Array = new Array(); // creates an array with 3 numerical values var arr2:Array = new Array(1,2,3);
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);
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, "hello", "world"}
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
Compiler: GCC, MSVC, BCC, Watcom
Libraries: Standard
/* Dynamic */ #include <stdlib.h> /* for malloc */ #include <string.h> /* for memset */ 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++
Compiler: GCC, 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#
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"} };
ColdFusion
Creates a one-dimensional Array
<cfset arr1 = ArrayNew(1)>
Creates a two-dimensional Array in CFScript
<cfscript> arr2 = ArrayNew(2); </cfscript>
ColdFusion Arrays are NOT zero-based, they begin at index 1
D
// dynamic array int[] numbers = new int[5]; // static array int[5] = [0,1,2,3,4];
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
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
Interpeter: Python 2.3, 2.4, 2.5 Libraries: None are needed
A Python list() is implemented as a dynamical 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:
array[1][3]
Alternatively you can create it programmatically with a list comprehension:
array = [[i]*6 for i in xrange(4)]
Create an empty array:
array = []
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 4th 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
For example for an array of 10 int values:
int[] intArray = new int[10];
Creating an array of Strings:
String[] s = {"hello" , "World" };
JavaScript
var myArray = new Array(); var myArray2 = new Array("Item1","Item2"); var myArray3 = ["Item1", "Item2"];
MaxScript
Interpreter: 3D Studio Max 8
myArray = #() myArray2 = #("Item1", "Item2")
mIRC Scripting Language
Interpeter: mIRC Script Editor Libraries: mArray Snippet
alias creatmearray { .echo -a $array_create(MyArray, 5, 10) }
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
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
Compiler: Visual Studio .NET 2005
Dim myArray() as String = New String() {"Hello", "World", "!"}