gistfile1.c

/*
 * Compare two cards and return:
 *   < 0 if a is smaller than b
 *     0 if a is equal to b
 *   > 0 if a is greater than b
 */
int CardCompare(const Card* a, const Card* b) {
    if (a == NULL)
        return 1;
    if (b == NULL)
        return -1;
    return a->rank - b->rank;
}


/*
 * Returns whether a card has valid values for its
 * rank and suit.
 */
int CardIsValid(const Card* c) {
    return c != NULL &&
        (c->rank >= Deuce && c->rank <= Ace &&
         c->suit >= Club  && c->suit <= Spade);
}