This example will illustrate the key steps in creating and using a dynamic array. It implements the ideas above for reading and sorting an unknown number of integer values.

Here is an initial version. (It works, but has a potential memory leak. Here it doesn't matter since the memory is released when the program terminates. However, in a larger program that continues after these steps, the memory leak would be a problem. In general, dynamic memory allocated from the heap by a program should be explicitly released when no longer used.)

int main()
{
      int sz;

      printDirections();

      cout << "How many integers to generate and sort? ";
      cin >> sz;
      int *nums = new int[sz];

      init(nums, sz);
      sort(nums, sz);
      print(nums, sz);

      return 0;
}