# 隨機發牌

// Fig. 10.3: fig10_03.c
// Card shuffling and dealing program using structures
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define CARDS 52
#define FACES 13
             
struct card {const char *face,*suit;};
typedef struct card Card; // new type name for struct card   

// prototypes
void fillDeck(Card * const wDeck, const char * wFace[], 
   const char * wSuit[]);
void shuffle(Card * const wDeck);
void deal(const Card * const wDeck);

int main(void)
{ 
   Card deck[CARDS]; // define array of Cards

   // initialize array of pointers
   const char *face[] = {"Ace", "Deuce", "Three", "Four", "Five",
      "Six", "Seven", "Eight", "Nine", "Ten",
      "Jack", "Queen", "King"};

   // initialize array of pointers
   const char *suit[] = {"Hearts", "Diamonds", "Clubs", "Spades"};

   srand(time(NULL)); // randomize

   fillDeck(deck, face, suit); // load the deck with Cards
   shuffle(deck); // put Cards in random order
   deal(deck); // deal all 52 Cards
} 

// place strings into Card structures
void fillDeck(Card * const wDeck, const char * wFace[], 
   const char * wSuit[])
{ 
   // loop through wDeck
   for (size_t i = 0; i < CARDS; ++i) { 
      wDeck[i].face = wFace[i % FACES];
      wDeck[i].suit = wSuit[i / FACES];
   } 
} 

// shuffle cards
void shuffle(Card * const wDeck)
{ 
   // loop through wDeck randomly swapping Cards
   for (size_t i = 0; i < CARDS; ++i) { 
      size_t j = rand() % CARDS;
      Card temp = wDeck[i];      
      wDeck[i] = wDeck[j];
      wDeck[j] = temp;      
   } 
} 

// deal cards
void deal(const Card * const wDeck)
{ 
   // loop through wDeck
   for (size_t i = 0; i < CARDS; ++i) {
      printf("%5s of %-8s%s", wDeck[i].face, wDeck[i].suit,
         (i + 1) % 4 ? "  " : "\n");
   } 
}