Code
#include <bits/stdc++.h>
using namespace std;

// Class to handle insertion
class Solution {
public:
    // Function to insert at end of array
    vector<int> insertAtEnd(vector<int>& arr, int x) {
        // Push element at the back
        arr.push_back(x);
        return arr;
    }
};

// Driver code
int main() {
    vector<int> arr = {1, 2, 3, 4};
    int x = 5;

    Solution obj;
    arr = obj.insertAtEnd(arr, x);

    for (int num : arr) {
        cout << num << " ";
    }
    cout << endl;

    return 0;
}
import java.util.*;

// Class to handle insertion
class Solution {
    // Function to insert at end of array
    public static int[] insertAtEnd(int[] arr, int x) {
        // Create new array with +1 size
        int[] newArr = new int[arr.length + 1];
        // Copy old elements
        for (int i = 0; i < arr.length; i++) {
            newArr[i] = arr[i];
        }
        // Place new element at the end
        newArr[arr.length] = x;
        return newArr;
    }
}

// Driver class
public class Main {
    public static void main(String[] args) {
        int[] arr = {1, 2, 3, 4};
        int x = 5;

        arr = Solution.insertAtEnd(arr, x);

        for (int num : arr) {
            System.out.print(num + " ");
        }
        System.out.println();
    }
}