PERL

java how to initialize an array

int[] arr = new int[10];	//Can hold 10 elements

how to initialize array in java

int[] arr = new int[5];	 // integer array of size 5 you can also change data type

java array initialization

int[] data = {10,20,30,40,50,60,71,80,90,91};

// or

int[] data;
data = new int[] {10,20,30,40,50,60,71,80,90,91};

initialize array

    // designated initialization --> it's a way to initialize elements of an array by it's index,
    // and set the value of the other elements to 0

    // ex 1
    int arr[5] = {[2] = 5, [3] = 10};
    for (int i = 0; i < 5; i++)
    {
        printf("%d ", arr[i]); // 0 0 5 10 0
    }
	
	// ex 2
	int arr[10] = {1, 7, [2] = 5, [3] = 10};
	for(int i = 0;i<10;i++){
		printf("%d ", arr[i]); // 1 7 5 10 0 0 0 0 0 0
    }
	// ex 3
	int arr[ ] = {2, [5] = 1}; // size is 6
    printf("%lu", sizeof(arr)); // 24 --> 6 * 4

java how to initialize an array

int[] numbers = new int[5]; /* size of the array is 5 */
int[] nums = new int[] {1, 2, 3, 4, 5}; /* Fill the array ny these numbers*/
String[] names = new String[10]; /* array of type string and size 10 */
String[] countries = new String[] {"Germany", "US"}; 

array initialization

The array will be initialized to 0 if we provide the empty initializer list or just specify 0 in the initializer list.

int arr[5] = {};    // results in [0, 0, 0, 0, 0]
int arr[5] = { 0 };  // results in [0, 0, 0, 0, 0]

array initialization

#include <string>
#include <iterator>
#include <iostream>
#include <algorithm>
#include <array>
 
int main()
{
    // construction uses aggregate initialization
    std::array<int, 3> a1{ {1, 2, 3} }; // double-braces required in C++11 prior to
                                        // the CWG 1270 revision (not needed in C++11
                                        // after the revision and in C++14 and beyond)
 
    std::array<int, 3> a2 = {1, 2, 3};  // double braces never required after =
 
    std::array<std::string, 2> a3 = { std::string("a"), "b" };
 
    // container operations are supported
    std::sort(a1.begin(), a1.end());
    std::reverse_copy(a2.begin(), a2.end(), 
                      std::ostream_iterator<int>(std::cout, " "));
 
    std::cout << '
';
 
    // ranged for loop is supported
    for(const auto& s: a3)
        std::cout << s << ' ';
 
    // deduction guide for array creation (since C++17)
    [[maybe_unused]] std::array a4{3.0, 1.0, 4.0};  // -> std::array<double, 3>
}

how to initialize an array in javascript

var array_name = [item1, item2, ...];  

How to initialize an array

my @array = ();