g++ -c GoodDeck.cpp
GoodDeck.cpp:15:5: error: prototype for ‘int Deck::get_num_cards()’ does not match any in class ‘Deck’
 int Deck::get_num_cards()
     ^
In file included from GoodDeck.cpp:3:0:
GoodDeck.h:13:7: error: candidate is: int Deck::get_num_cards() const
   int get_num_cards() const;
       ^
GoodDeck.cpp:20:5: error: prototype for ‘int Deck::get_card(int)’ does not match any in class ‘Deck’
 int Deck::get_card(int index)
     ^
In file included from GoodDeck.cpp:3:0:
GoodDeck.h:12:15: error: candidate is: const Card* Deck::get_card(int) const
   const Card *get_card(int index) const;
               ^
In file included from GoodDeck.h:3:0,
                 from GoodDeck.cpp:3:
Card.h: In member function ‘int Deck::find_index(int, int) const’:
Card.h:8:9: error: ‘int Card::value’ is private
     int value;
         ^
GoodDeck.cpp:29:16: error: within this context
   if((cards[i].value==value) && (cards[i].suit == suit)) return i;
                ^
In file included from GoodDeck.h:3:0,
                 from GoodDeck.cpp:3:
Card.h:7:9: error: ‘int Card::suit’ is private
     int suit;
         ^
GoodDeck.cpp:29:43: error: within this context
   if((cards[i].value==value) && (cards[i].suit == suit)) return i;