发牌

读一手5张牌，并将其分类

//Classifies a pocker hand.

#include<stdio.h>
#include<stdbool.h>
#include<stdlib.h>

#define NUM_RANKS 13
#define NUM_SUITS 4
#define NUM_CARDS 5

//external variables.
int num_in_rank[NUM_RANKS];
int num_in_suit[NUM_SUITS];
bool straight, flush, four, three;
int pairs;    //can be 0, 1, 2

//prototypes
void read_cards(void);
void analyze_hand(void);
void print_result(void);

//main: Calls read_cards, analyze_hand, and print_result repeatedly.            
int main(void)
{
    for (;;) {
        read_cards();
        analyze_hand();
        print_result();
    }
}

//read_cards: Reads the cards into the external variables num_in_rank 
//and num_in_suit; cheaks for bad cards and duplicate cards.
void read_cards(void)
{
    bool card_exists[NUM_RANKS][NUM_SUITS];
    char ch, rank_ch, suit_ch;
    int rank, suit;
    bool bad_card;
    int cards_read = 0;

    for (rank = 0; rank < NUM_RANKS; rank++) {
        num_in_rank[rank] = 0;
        for (suit = 0; suit < NUM_SUITS; suit++) {
            card_exists[rank][suit] = false;
        }
    }

    for (suit = 0; suit < NUM_SUITS; suit++) {
        num_in_suit[suit] = 0;
    }

    while (cards_read < NUM_CARDS) {
        bad_card = false;

        printf("Enter a card: ");

        rank_ch = getchar();
        switch (rank_ch) {
        case '0':                exit(EXIT_SUCCESS);
        case '2':                rank = 0; break;
        case '3':                rank = 1; break;
        case '4':                rank = 2; break;
        case '5':                rank = 3; break;
        case '6':                rank = 4; break;
        case '7':                rank = 5; break;
        case '8':                rank = 6; break;
        case '9':                rank = 7; break;
        case 't': case 'T':        rank = 8; break;
        case 'j': case 'J':        rank = 9; break;
        case 'q': case 'Q':        rank = 10; break;
        case 'k': case 'K':        rank = 11; break;
        case 'a': case 'A':        rank = 12; break;
        default:                bad_card = true;
        }

        suit_ch = getchar();
        switch (suit_ch) {
        case 'c': case'C': suit = 0; break;
        case 'd': case'D': suit = 1; break;
        case 'h': case'H': suit = 2; break;
        case 's': case'S': suit = 3; break;
        default:           bad_card = true;
        }

        while ((ch = getchar()) != '\n')
            if (ch != ' ') bad_card = true;
        if (bad_card)
            printf("Bad card; ignored.\n");
        else if (card_exists[rank][suit])
            printf("Duplicate card; ignored.\n");
        else {
            num_in_rank[rank]++;
            num_in_suit[suit]++;
            card_exists[rank][suit] = true;
            cards_read++;
        }
    }
}

//analyze_hand: determines whether the hand contains a straight, a flush, four-of-a-kind, 
//and/or three-of-a-kind;determines the number of pairs; stores the result into the erxternal 
//variables straight, flush, four, three, and pairs.
void analyze_hand(void)
{
    int num_consec = 0;
    int rank, suit;

    straight = false;
    flush = false;
    four = false;
    three = false;
    pairs = 0;

    //check for straight.
    for (suit = 0; suit < NUM_SUITS; suit++)
        if (num_in_suit[suit] == NUM_CARDS)
            flush = true;
    //check for straight.
    rank = 0;
    while (num_in_rank[rank] == 0) rank++;
    for (; rank < NUM_RANKS && num_in_rank[rank]; rank++)
        num_consec++;
    if (num_consec == NUM_CARDS) {
        straight = true;
        return;
    }

    //cheak for 4-of-kind, 3-of-kind, and pairs.
    for (rank = 0; rank < NUM_RANKS; rank++) {
        if (num_in_rank[rank] == 4) four = true;
        if (num_in_rank[rank] == 3) three = true;
        if (num_in_rank[rank] == 2) pairs++;
    }
}
//print_result: prints the classification of the hand, based on the values of 
//external variables straight, flush, four, three, and pairs.
void print_result(void)
{
    if (straight && flush)    
        printf("Straight of flush.");
    else if (four)
        printf("Four of a kind.");
    else if (three && pairs == 1)
        printf("Full house");
    else if (flush)
        printf("Flush");
    else if (straight)
        printf("Straight");
    else if (three)
        printf("Three of a kind");
    else if (pairs == 2)
        printf("Two pairs");
    else if (pairs == 1)
        printf("Pair");
    else
        printf("High card");

    printf("\n\n");
}