Defining an array
1. Without specifying the size of the array:
int arr[] = {1, 2, 3};Although the array cannot be left empty in this scenario, we can leave the square brackets empty. It must contain elements.
2. With specifying the size of the array:
int arr[3];
arr[0] = 1, arr[1] = 2, arr[2] = 3;Accessing an array element
An array element can be easily retrieved by its index number.
An index number is a sort of number that allows us to access array variables. In a programme, index numbers provide a way to retrieve each element of an array. It should be noted that the index number begins with 0 and not one.
#include <iostream>
using namespace std;
int main()
{
int arr[] = {1, 2, 3};
cout << arr[1] << endl;
}
Output:
2
Changing an array element
An element in an array can be overwritten using its index number.
Example:
#include <iostream>
using namespace std;
int main()
{
int arr[] = {1, 2, 3};
arr[2] = 8; //changing the element on index 2
cout << arr[2] << endl;
}
Output:
8
