Array and its Operations

#include<iostream>
#include<array>
using namespace std;
int main()
{
    array<int,4> a={1, 2, 3, 4}; // declaration
    int size=a.size();
    for(int i=0;i<size;i++)
    {
        cout<<a[i]<<" ";
    }
    cout<<endl;
    
    cout<<"element at second index : "<<a.at(2)<<endl; // for printing element at a particular position/index
    
    cout<<"empty or not : "<<a.empty()<<endl; // for checking the given array is empty or not
    
    cout<<"first element : "<<a.front()<<endl; // for printing first element of array
    cout<<"last element : "<<a.back()<<endl; // for printing last element of array

    return 0;
}