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blackjack.c
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blackjack.c
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <stdbool.h>
const char *cardFormat = "+---------+\n\
| %-2s |\n\
| |\n\
| %s |\n\
| |\n\
| %2s |\n\
+---------+\n";
char *suits[2][4] = {
{"♠", "♥", "♣", "♦"},
{"♤", "♡", "♧", "♢"}
};
typedef struct Card{
char symbol[3];
int value;
int suit;
int color;
} card;
typedef struct Player{
float bank;
int score;
bool dealer;
int index;
card *hand;
} player;
void play(void);
void initializeDeck(card *deckPtr, int deckSize);
void shuffleDeck(card *deckPtr, int deckSize);
void printDeck(card *deckPtr, int deckSize);
void printCard(card card);
void printHand(player player, bool withHoleCard);
card drawCard(card **deckPtr, int *deckSize);
bool deal(card **deckPtr, int *deckSize, player *player);
int main(void){
bool playing = true;
char action;
srand(time(NULL));
while (playing){
play();
printf("Play again ([y]es/[n]o)? ");
scanf(" %c", &action);
action = tolower(action);
playing = action == 'y';
}
return 0;
}
void play(void){
int deckSize = 52;
card *deckPtr;
player p = {10000, 0, false, 0};
player dealer = {0, 0, true, 0};
float bet = 0;
char action;
deckPtr = malloc(sizeof(card) * deckSize);
if (deckPtr == NULL){
printf("malloc() failed!\n");
}
else{
initializeDeck(deckPtr, deckSize);
shuffleDeck(deckPtr, deckSize);
while (deckSize > 0 && p.bank > 0){
p.score = 0;
p.index = 0;
card playerHand[11];
p.hand = playerHand;
dealer.score = 0;
dealer.index = 0;
card dealerHand[11];
dealer.hand = dealerHand;
bet = 0;
while (bet == 0 || bet > p.bank){
printf("Place your bet (bank: $%'.2f): ", p.bank);
scanf("%f", &bet);
}
for (int i = 0; i < 4; i++){
player *players[2] = {&p, &dealer};
if (!deal(&deckPtr, &deckSize, players[i % 2])){
printf("Deck is empty!\n");
return;
}
}
while (p.score < 21){
printHand(dealer, true);
printHand(p, false);
action = '\0';
while (action != 'h' && action != 's'){
printf("Would you like to [h]it or [s]tand? ");
scanf(" %c", &action);
}
if (action == 'h'){
if (!deal(&deckPtr, &deckSize, &p)){
printf("Deck is empty!\n");
return;
}
}
else{
break;
}
}
while (dealer.score < 17){
if (!deal(&deckPtr, &deckSize, &dealer)){
printf("Deck is empty!\n");
return;
}
}
printHand(dealer, false);
printHand(p, false);
if (p.score > 21){
printf("Bust! (-$%.2f)\n", bet);
p.bank -= bet;
}
else if (p.score == dealer.score){
printf("Push! (+$0.00)\n");
}
else if (p.score == 21){
printf("Blackjack! (+$%.2f)\n", bet * 1.5);
p.bank += bet * 1.5;
}
else if (dealer.score > 21){
printf("Player wins! (+$%.2f)\n", bet);
p.bank += bet;
}
else if (p.score > dealer.score){
printf("Player wins! (+$%.2f)\n", bet);
p.bank += bet;
}
else if (p.score < dealer.score){
printf("Dealer wins! (-$%.2f)\n", bet);
p.bank -= bet;
}
}
if (deckSize == 0){
printf("Deck is empty!\n");
}
else if (p.bank == 0){
printf("Out of money!\n");
}
}
free(deckPtr);
}
void initializeDeck(card *deckPtr, int deckSize){
int value;
for (int i = 0; i < deckSize; i++){
value = i % 13 + 1;
switch (value){
case 1:
strcpy(deckPtr[i].symbol, "A");
deckPtr[i].value = 11;
break;
case 11:
strcpy(deckPtr[i].symbol, "J");
deckPtr[i].value = 10;
break;
case 12:
strcpy(deckPtr[i].symbol, "Q");
deckPtr[i].value = 10;
break;
case 13:
strcpy(deckPtr[i].symbol, "K");
deckPtr[i].value = 10;
break;
default:
sprintf(deckPtr[i].symbol, "%d", value);
deckPtr[i].value = value;
}
deckPtr[i].suit = i % 4;
deckPtr[i].color = i % 2;
}
}
void shuffleDeck(card *deckPtr, int deckSize){
int j;
card temp;
for (int i = 0; i < deckSize - 2; i++){
j = i + rand() % (deckSize - i);
temp = deckPtr[i];
deckPtr[i] = deckPtr[j];
deckPtr[j] = temp;
}
}
void printDeck(card *deckPtr, int deckSize){
for (int i = 0; i < deckSize; i++){
printCard(deckPtr[i]);
}
}
void printCard(card card){
printf(cardFormat, card.symbol, suits[card.color][card.suit], card.symbol);
}
void printHand(player player, bool withHoleCard){
char cardFormatCopy[84];
char *token;
if (player.dealer){
if (withHoleCard){
printf("Dealer (?)\n");
}
else{
printf("Dealer (%d)\n", player.score);
}
}
else{
printf("Player (%d)\n", player.score);
}
strcpy(cardFormatCopy, cardFormat);
token = strtok(cardFormatCopy, "\n");
while (token != NULL){
for (int i = 0; i < player.index; i++){
if (strstr(token, "%-2s") != NULL){
if (withHoleCard && i == 0){
printf(token, "?");
}
else{
printf(token, (player.hand + i)->symbol);
}
}
else if (strstr(token, "%s") != NULL){
if (withHoleCard && i == 0){
printf(token, "?");
}
else{
printf(token, suits[(player.hand + i)->color][(player.hand + i)->suit]);
}
}
else if (strstr(token, "%2s") != NULL){
if (withHoleCard && i == 0){
printf(token, "?");
}
else{
printf(token, (player.hand + i)->symbol);
}
}
else{
printf("%s", token);
}
printf("\t");
}
puts("");
token = strtok(NULL, "\n");
}
}
card drawCard(card **deckPtr, int *deckSize){
card topCard;
if (*deckSize > 0){
topCard = (*deckPtr)[--(*deckSize)];
}
if (*deckSize > 0){
*deckPtr = realloc(*deckPtr, sizeof(card) * (*deckSize));
if (*deckPtr == NULL){
printf("realloc() failed!\n");
}
}
return topCard;
}
bool deal(card **deckPtr, int *deckSize, player *player){
card dealCard;
dealCard = drawCard(deckPtr, deckSize);
if (*deckSize == 0){
return false;
}
player->hand[player->index++] = dealCard;
if (strcmp(dealCard.symbol, "A") == 0 && player->score >= 11){
player->score++;
}
else{
player->score += dealCard.value;
}
return true;
}