#include <stl.h>
#include <iostream.h>
#include <string.h>

int main ()
{
  vector <int> v1 (3);
  vector <int> v2 (v1.size ());
  for (int i = 0; i < v1.size (); i++)
  {
    v1[i] = i + 1;
    v2[i] = v1.size () - i;
  }
  ostream_iterator<int> iter (cout, " ");
  cout << "Inner product (sum of products) of:\n\t";
  copy (v1.begin (), v1.end (), iter);
  cout << "\n\t";
  copy (v2.begin (), v2.end (), iter);
  int result = inner_product (v1.begin (), v1.end (), v2.begin (), 0);
  cout << "\nis: " << result << endl;
  return 0;
}