int main(void) {
  book shelf[MAX_BOOKS];
  int i;

  shelf[0] =
     make_book("C by Disssection", "Kelley & Pohl", 
               "Addison Wesley", 2001, 1);   

  shelf[1] =
    make_book("Pelle Erobreren", "Martin Andersen Nexoe",
              "Gyldendal", 1910, 0);

  shelf[2] = shelf[1];
  shelf[2].title = "Ditte Menneskebarn"; 
  shelf[2].publishing_year = 1917;

  for(i = 0; i <=2; i++)
    prnt_book(shelf[i]);
  
  return 0;
}