#include <iostream>

using namespace std;

//fucntion adds a value to an array and expands the array  if its full
int* expand(int*, int, int&);

//helper print function
void print(int*, int);

int main()
{
    int* oldarr = 0;
    int length = 0;
    int input;

    do
    {
        cout << "Enter an integer: ";
        cin >> input;

        oldarr = expand(oldarr, input, length);
        print(oldarr, length);

    } while (input != -99);

    delete[] oldarr;
    oldarr = 0;

    cin.get();
    return 0;
}

int* expand(int* oldarr, int newvalue, int& length)
{
    // dynamically create a new array that is length + 1
    int* newarr = new int[length + 1];

    // copy all the values from the old array to the new one
    for (int i = 0; i < length; i++)
        newarr[i] = oldarr[i];

    // add the new value to the end of the array
    newarr[length] = newvalue;

    // delete old array
    delete[] oldarr;

    length++;

    return newarr;
}

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