#include <iostream>
using namespace std;

void get(double*& a, int& n)
{
  cout << "Enter number of items: "; cin >> n;
  a = new double[n];
  cout << "Enter " << n << " items, one per line:\n";
  for (int i = 0; i < n; i++)
    { cout << "\t" << i+1 << ": ";
      cin >> a[i];
    }
}

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

int main()
{
  double* a; // a is simply an unallocated pointer
  int n;
  get(a,n); // now a is an array of n doubles
  print(a,n);
  delete [] a; // now a is simply an unallocated pointer again
  get(a,n); // now a is an array of n doubles
  print(a,n);
  return 0;
}