Creating an Array: Difference between revisions
Properly ordering the languages
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In this task, the goal is to create an [[array]].
==[[
'''
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}}
==[[BASIC]]==
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myArray(1,2) = "Item2"
==[[
'''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++]]==
'''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#]]==
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]]==
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#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]]
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]]==
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#=> [[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]]==
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String[] s = {"hello" , "World" };
==[[
var myArray = new Array();
var myArray2 = new Array("Item1","Item2");
var myArray3 = ["Item1", "Item2"];
==[[3DS Max 8 - MaxScript]]==
myArray = #()
myArray2 = #("Item1", "Item2")
==[[mIRC]]==
'''Interpeter:''' mIRC Script Editor
'''Libraries:''' [[mArray Snippet]]
alias creatmearray { .echo -a $array_create(MyArray, 5, 10) }
==[[
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]]==
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"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", "!"}
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