public class Deck {
    private Card[] draw; //draw pile
    private Card[] discard; //discard pile
    private int numDraw; //how many cards in the draw pile
    private int numDiscard; //how many cards in discard pile

    /**
     * Creates a 52 card standard deck, in order.
     */
    public Deck() {
        draw = new Card[52];
        discard = new Card[52];
        numDraw = 52;
        numDiscard = 0;

        for(int i = 0; i < 4; i++) { //i is the suit
            for(int j = 1; j <= 13; j++) { //j is the rank
                int x = i*13 + j - 1; //the index where this card goes
                draw[x] = new Card(i, j);
            }
        }
    }

    /**
     * Returns a card in the draw pile.
     * @param i the index of the card to return
     * @return the card at the given index
     */
    public Card cardAt(int i) {
        return draw[i];
    }

    public String toString() {
        String ret = "draw pile: ";
        for(int q = 0; q < numDraw-1; q++) {
            ret = ret + draw[q] + ", ";
        }
        ret = ret + draw[numDraw-1];
        return ret;
    }
}