Array Program for inserting index value

#include <iostream>

using namespace std;

// Prototype

void insert_at(int arr[], int &size, int index, int value);

int main() {

int arr[100] = {1, 2, 4}, size = 3;

insert_at(arr, size, 2, 3);

for (int i = 0; i < size; i++) cout << arr[i] << " ";

return 0;

}

// Definition

void insert_at(int arr[], int &size, int index, int value) {

for (int i = size; i > index; i--) arr[i] = arr[i - 1];

arr[index] = value;

size++;

}