C++ vector iterator assignment

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main()//from  w  w w .j a  va  2 s  . c  om
{
   int beginRange, endRange;
   int arr[] = { 11, 13, 15, 17, 19, 21, 23, 25, 27, 29 };
   vector<int> v1(arr, arr+10);  // initialized vector
   vector<int> v2(10);           // uninitialized vector
   cout << "Enter range to be copied (example: 2 5): ";
   cin >> beginRange >> endRange;
   vector<int>::iterator iter1 = v1.begin() + beginRange;
   vector<int>::iterator iter2 = v1.begin() + endRange;
   vector<int>::iterator iter3;
   // copy range from v1 to v2
   iter3 = copy( iter1, iter2, v2.begin() );
   // (it3 -> last item copied)
   iter1 = v2.begin();           // iterate through range
   while(iter1 != iter3)         // in v2, displaying values
      cout << *iter1++ << ' ';
   cout << endl;
   return 0;
}