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

int main ()
{
  char* word1 = "World";
  char* word2 = "Hello";
  cout << word1 << " " << word2 << endl;
  swap_ranges (word1, word1 + ::strlen (word1), word2);
  cout << word1 << " " << word2 << endl;
  return 0;
}