Deck of cards in C

cards.c

#include <stdio.h>
#include <stdlib.h>
#include <cs50.h>
#include <time.h>

#define DECK_SIZE 52

// strings for pretty printing values
string ranks[14] = {"", "Ace", "Two", "Three", "Four", "Five", "Six",
                    "Seven", "Eight", "Nine", "Ten", "Jack", "Queen", "King"};
string suits[4] = {"Hearts", "Clubs", "Spades", "Diamonds"};

// each card has two properties
typedef struct
{
    int suit;
    int rank;
} card;

// function prototypes
card deal_card();
void shuffle();

card deck[DECK_SIZE];

// keeps track of the next card to deal
// increment this every time you deal a card
// shuffle and reset this to 0 to start a new game
int next_card = 0;


int main(void)
{
    // seed the rng
    srand(time(0));
    // create the deck of unique cards
    int n = 0;
    for (int s = 0; s < 4; s++)
    {
        for (int r = 1; r <= 13; r++)
        {
            deck[n].rank = r;
            deck[n].suit = s;
            n++;
        }
    }

    shuffle();

    // print the deck
    // for (int i = 0; i < DECK_SIZE; i++)
    // {
    //     printf("%s of %s\n", ranks[deck[i].rank], suits[deck[i].suit]);
    // }

    // example: deal 5 random cards
    printf("Your hand:\n");
    for (int i = 0; i < 5; i++)
    {
        card c = deal_card();
        printf("%s of %s\n", ranks[c.rank], suits[c.suit]);
    }
}


// performs a Fisher-Yates shuffle on the deck
void shuffle()
{
    for (int i = DECK_SIZE - 1; i > 0; i--)
    {
        int j = rand() % (i + 1);
        card tmp = deck[i];
        deck[i] = deck[j];
        deck[j] = tmp;
    }
}


// returns the next card in the deck
// make sure you've shuffled first!
card deal_card()
{
    card c = deck[next_card];
    next_card++;
    return c;
}