#include<iostream>
using namespace std;

void print_array(int arr[], int length){
	cout << "[";
	for(int i = 0; i < length; i++)
		cout << arr[i] << ", ";
	cout << "\b\b]\n";
}

int main(){
	int arr[] = {2, 4, 6, 8, 10, 12, 14, 16, 18, 20};
	int array_length = sizeof(arr)/sizeof(int); // This does give us the length
	cout << "Our array takes up " << sizeof(arr) << " bytes\n";
	print_array(arr, array_length);
	
	// calculate average value
	double sum = 0;
	for(int n : arr)
		sum += n;
	double average = sum / 10;
	cout << "The average in our array is " << average << endl;

	// Let's delete an item
	int index_to_delete = 2;
	array_length--;
	for(int i = index_to_delete; i < array_length; i++)
		arr[i] = arr[i+1];
	print_array(arr, array_length);

	// Let's add a 60 where the 6 was
	// We have a fixed amount of space, but it'll fit
	int index_to_insert = 2;
	for(int i = array_length; i >= index_to_insert; i--)
		arr[i+1] = arr[i];
	arr[index_to_insert] = 60;
	array_length++;
	print_array(arr, array_length);

	


	return 0;
}