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

  shelf[0] =
    make_book("Problem Solving and Program Design in C", "Hanly and Koffman", 
              "Pearson", 2010, 1);   

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

  shelf[2] =
    make_book("The C Programming Language", "Kernighan og Ritchie", 
              "Prentice Hall", 1988, 1);   

  shelf[3] =
    make_book("Pelle Erobreren", "Martin Andersen Nexoe",
              "Gyldendal", 1910, 0);

  shelf[4] = shelf[3];
  strcpy(shelf[4].title, "Ditte Menneskebarn");
  shelf[4].publishing_year = 1917;

  for(i = 0; i <=4; i++)
    prnt_book(shelf[i]);
  
  return 0;
}