C error Undefined reference to Class Function

Question

I was wondering if anyone could help me out with this - I m only new to C   and it s causing me a fair amount of troubles   I m trying to make relatively simple Deck and Card class objects    The error is showing up in  Deck cpp   declaration of an array of cards  and then when i try to fill the array with card objects  It says there s an undefined reference to Card  Card    Card  Card Card  Rank  Card  Suit  and Card   Card     I ve got all my includes seemingly right  so I don t know what s going wrong   The code is as follows   deck h   ifndef DECK H  define DECK H  include  card h   class Deck    public      Deck         Deck        Card DealNextCard        void Shuffle        void DisplayDeck    protected  private        endif    DECK H   deck cpp   include  Deck h   include  card h   using namespace std   const int NUM TOTAL CARDS   52  const int NUM SUITS   4  const int NUM RANKS   13  Card  cardArray  void Deck         cardArray   new Card NUM TOTAL CARDS       int cardCount   0      for  int i   0  i  gt  NUM SUITS  i              for  int j   0  j  gt  NUM RANKS  j                  cardArray cardCount    Card Card  Rank i   Card  Suit j                 cardCount                        Card DealNextCard    void Shuffle    void DisplayDeck      card h  class Card        public          enum Suit  D 0  H  C  S           enum Rank  ONE 0  TWO  THREE  FOUR  FIVE  SIX  SEVEN  EIGHT  NINE  TEN  J  Q  K  A           Card Card  Rank  Card  Suit           Card            virtual  Card            Card  Suit suit          Card  Rank rank          Card  Rank GetRank            Card  Suit GetSuit            std  string CardName         protected       private        endif    CARD H   card cpp   include  card h  using namespace std    Card  Suit cardSuit  Card  Rank cardRank   void Card           nothing          void Card Card  Rank rank  Card  Suit suit    cardRank   rank  cardSuit   suit     Card  Rank GetRank     return cardRank    Card  Suit GetSuit     return cardSuit    std  string CardName         string test      test    testing string       return test

User · Answer

This part has problems   Card  cardArray  void Deck         cardArray   new Card NUM TOTAL CARDS       int cardCount   0      for  int i   0  i  gt  NUM SUITS  i         Error         for  int j   0  j  gt  NUM RANKS  j        Error             cardArray cardCount    Card Card  Rank i   Card  Suit j                 cardCount                           cardArray is a dynamic array  but not a member of Card class  It is strange if you would like to initialize a dynamic array which is not member of the class void Deck   is not constructor of class Deck since you missed the scope resolution operator  You may be confused with defining the constructor and the function with name Deck and return type void  in your loops  you should use  lt  not  gt  otherwise  loop will never be executed

User · Answer

Specify the Class Card for the constructor-   void Card  Card Card  Rank rank  Card  Suit suit      And also define the default constructor and destructor

User · Answer

What are you using to compile this  If there s an undefined reference error  usually it s because the  o file  which gets created from the  cpp file  doesn t exist and your compiler build system is not able to link it   Also  in your card cpp  the function should be Card  Card   instead of void Card  The Card   is scoping  it means that your Card   function is a member of the Card class  which it obviously is  since it s the constructor for that class   Without this  void Card is just a free function  Similarly    void Card Card  Rank rank  Card  Suit suit   should be   Card  Card Card  Rank rank  Card  Suit suit   Also  in deck cpp  you are saying  include  Deck h  even though you referred to it as deck h  The includes are case sensitive

User · Answer

In the definition of your Card class  a declaration for a default construction appears   class Card                   Card        lt    Declaration of default constructor                   But no corresponding definition is given  In fact  this function definition  from card cpp    void Card       nothing     Does not define a constructor  but rather a global function called Card that returns void  You probably meant to write this instead   Card  Card       nothing     Unless you do that  since the default constructor is declared but not defined  the linker will produce error about undefined references when a call to the default constructor is found     The same applies to your constructor accepting two arguments  This   void Card Card  Rank rank  Card  Suit suit        cardRank   rank      cardSuit   suit      Should be rewritten into this   Card  Card Card  Rank rank  Card  Suit suit        cardRank   rank      cardSuit   suit      And the same also applies for other member functions  it seems you did not add the Card   qualifier before the member function names in their definitions  Without it  those functions are global functions rather than definitions of member functions     Your destructor  on the other hand  is declared but never defined  Just provide a definition for it in card cpp   Card   Card

[c++] C++ error 'Undefined reference to Class::Function()'

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