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//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");
}