#include <cstring>
#include <iostream>

int main()
{
  using namespace std;
  const char *p = "Hallo, Welt";
  char q[20];

  strxfrm(q, p, 20);

  cout << q << '\n';
  cout << "Laenge Kopie = " << strxfrm(NULL, p, 0) << '\n';
}