struct book {
  int isbn;
  String2002 title;
};
 
// some sample functions
 
// sets the ISBN and title of a book
void setBook(int newIsbn, const String2002 &newTitle, book &myBook);
 
// returns the ISBN of a book
int getBookIsbn(const book &myBook);
 
// returns the 3rd letter in title, or '0', if title shorter than that
char getBookTitle3rdChar(const book &myBook);
 
// returns true if two books have the same ISBN, false otherwise
bool compareBooks(const book &book1, const book &book2);