Object Oriented C Example

oo.c

#import <stdio.h>
#import <stdlib.h>

typedef enum {
  heart = 0,
  spade = 1,
  diamond = 2,
  club = 3
} Suit;

char *SuitName(Suit suit) {
  switch (suit) {
    case heart: return "Hearts";
    case spade: return "Spades";
    case diamond: return "Diamonds";
    case club: return "Clubs";
  }
}

// ----

typedef struct {
  int value;
  Suit suit;
} Card;

char *CardValueString(Card card) {
  switch (card.value + 1) {
    case 1: return "Ace";
    case 11: return "Jack";
    case 12: return "Queen";
    case 13: return "King";
    default: return NULL;
  }
}

// ----

typedef struct {
  Card cards[52];
} Deck;
void DeckInitialize(Deck *deck) {
  for (int i = 0; i < 52; i++) {
    deck->cards[i].value = i % 13;
    deck->cards[i].suit = i / 13;
  }
}

void DeckPrint(Deck *deck) {
  for (int i = 0; i < 52; i++) {
    Card card = deck->cards[i];
    char *cardValueString = CardValueString(card);
    if (NULL != cardValueString) {
      printf("Card %02d: %s of %s\n",
        i + 1, cardValueString, SuitName(card.suit));
    } else {
      printf("Card %02d: %d of %s\n",
        i + 1, card.value + 1, SuitName(card.suit));
    }
  }
}

Deck *DeckCreate() {
  Deck *deck = malloc(sizeof(Deck));
  DeckInitialize(deck);
  return deck;
}

void DeckDestroy(Deck *deck) {
  // any necessary pre-deallocation cleanup
  free(deck);
}

// ----

int main() {
  Deck *deck = DeckCreate();
  DeckPrint(deck);
  DeckDestroy(deck);
  return 0;
}