#include <stdlib.h>  // atoi()

#include <iostream>
using namespace std;

void PrintArrayPtr(int *arr, int size)
{
        int *arr_ptr = arr;

        for (int i=0; i<size; ++i, arr_ptr++) {
                cout << "arr[" << i << "] = " << *arr_ptr << endl;
        }
}

// This is WRONG.  Should not return address of a local variable.
void alloc_array(int *&arr, int size)
{
	int rtn_array[size];

	arr = rtn_array;
}

void add_one(int *arr, int size)
{
	for (int i=0; i<size; ++i) {
		arr[i] += 1;
	}
}

void manipulate_arr(int n)
{
	int arr[n];
	
	add_one(arr, n);
}













void add_one_to_array(int **arr, int *arr_size)
{
	// new
	int *tmp_arr = new int[(*arr_size) + 1];

	for(int i=0; i<(*arr_size); ++i) {
		tmp_arr[i] = (*arr)[i];
	}

	// delete
	delete [] *arr;

	*arr = tmp_arr;
	*arr_size = (*arr_size) + 1;
}


int main(int argc, char *argv[])
{
	int user_arr_size = 0;
	int *user_arr = 0;

	int i;
	for (i=0; ; ++i) {
		int user_num;

		cout << endl;
		cout << "enter number (0 to exit): ";
		cin >> user_num;

		if (0 == user_num) break;

		add_one_to_array(&user_arr, &user_arr_size);
		user_arr[i] = user_num;
	}

	PrintArrayPtr(user_arr, i);

	return 0;
}