#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include<time.h>

#define CARD_MAX 51
#define len(x) sizeof(x)/sizeof(x[0])	

void print_deck (int *deckOfCards);
void shuffel (int *array, int n);

static int rand_int(int n);

int main (int argc, char *argv[])
{
	int i;
	int deckOfCards[CARD_MAX];

	time_t t;
	srand((unsigned) time(&t));


	/* Clubs > Diamonds > Hearts > Spades
	 * 0-12			13-25			26-38			39-51
	 */
	
	for (i = 0; i<CARD_MAX; i++){
		deckOfCards[i]=i;
	}

	shuffel(deckOfCards, CARD_MAX);

	print_deck(deckOfCards);

	return 0;
}

// Add a starting position. I can have a variable that simply means "continue drawing/printing cards from here"
void print_deck(int *deckOfCards){
	int i;

	for (i = 0; i<=CARD_MAX; i++){
		printf("%d\n", deckOfCards[i]);
	}
}

void shuffel (int *array, int n){

	int i, j, tmp;


	for (i=n; i>-1 ;i--){
		
		j = rand_int(i + 1);

		tmp = array[j];
		array[j] = array[i];
		array[i] = tmp;
	}
}

static int rand_int(int n){
	
	int limit = RAND_MAX - RAND_MAX % n;

	int rnd;

	do {
		rnd=rand();
	}
	while (rnd >= limit);

	return rnd % n;
}