Gist containing the code to add an element to an array. Basic code, only for a display.

insertArray.cpp

#include <iostream>

using namespace std;

class array1 {
public:
    void a1() {
        int n, i;
        int no, pos;
        // Get the original number of elements in the array
        cout << "Enter no. of Elements of array: " << endl;
        cin >> n;

        // Once you have the number of elements,
        // keep in mind that the array needs to have 1 more space for the new element

        int arr[n + 1];

        cout << "Enter the elements" << endl;

        for (i = 0; i < n; ++i) {
            cin >> arr[i];
        }

        // Once elements enter ho gye, get the number to add
        // and the position to add it at
        cout << "Enter the number to add: " << endl;
        cin >> no;
        cout << "Enter the position to add it to: " << endl;
        cin >> pos;

        // Now shift the elements to the next position
        // for the elements AFTER the position choosed.
        for (i = n; i >= pos; i--) {
            arr[i + 1] = arr[i];
        }
        // Once this shift is done, put the new element at pos
        arr[pos] = no;


        cout << "The array elements are " << endl;
        // n + 1 because total elements are original n and an extra element.
        for (i = 0; i < n + 1; ++i) {
            cout << arr[i] << " ";
        }
    }
};

int main() {
    array1 ob;
    ob.a1();
    return 0;
}