Input Iterator

#include <iostream>
#include <vector>
#include <algorithm>
#include <iterator>
 
int main()
{
  int a[] = {1, 2, 3, 4, 5};
  vector<int> v(a, a+5);
  cout <<"\nInitial contents of v, displayed using the copy "
         "algorithm to copy values from\nv to the standard output "
         "with the help of an ostream_iterator:\n";
  copy(v.begin(), v.end(), ostream_iterator<int>(cout, " "));
 
  cout <<"\nNow we copy some values from standard input into a vector "
         "\nusing the copy algorithm and an istream_iterator.\nEnter five "
         "integer values, followed by your end-of-file character:\n";
 
  copy(istream_iterator<int>(cin), istream_iterator<int>(), v.begin());
 
  cin.ignore(80, '\n');
  cin.clear();
 
  cout << "\nFinal contents of v: ";
  copy(v.begin(), v.end(), ostream_iterator<int>(cout, " "));
 
  return 0;
}