How to Declare an Array in C++?

In C++, an array is a collection of similar data types in which elements are stored in contiguous memory locations. In this article, we will learn how to declare an array in C++.

Declaring an Array in C++

In C++, we can declare an array by specifying the type of its elements, followed by the name of the array and the size in square brackets.

Syntax to Declare an Array in C++

Datatype arrayName[arraySize];

To directly initialize the elements in the array we can use the below syntax:

Datatype ArrayName [ArraySize] = {element1, element2, ....}

If we want to declare an array with more dimensions, we can just keep adding the dimensions after the first dimensions with their size inside the array subscript operator.

C++ Program to Declare an Array

The below program illustrates how we can declare an array in C++.

C++

// C++ Program to show how to declare an array
#include <iostream>
using namespace std;

int main()
{
    // Declaring an array of 4 elements
    int arr[4] = { 1, 2, 3, 4 };

    // Print the elements of the array
    cout << "Array Elements: ";
    for (int i = 0; i < 4; i++)
        cout << arr[i] << " ";
    return 0;
}

Output

Array Elements: 1 2 3 4 

Time Complexity: O(1), constant time required only for declaration.
Auxiliary Space: O(N)