Thread: Blackjack

Hi there.

I am trying to write a blackjack game and I am running into a few teething problems. My main() function currently outputs what values are stored for certain variables, just to see if I'm doing things properly. Here is the code:

Code:

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

#define MAX 10

typedef struct {
  int card;
  int suit;
  int value;
} card_t;

void generate_card(card_t *crd, int *num, int *score);

int main(void) {

  /* current scores for dealer and player */
  int p_score = 0;
  int d_score = 0;

  /* number of cards in their hand */
  int p_numofcards = 0;
  int d_numofcards = 0;

  /* initialise hands */
  card_t p_hand[MAX];
  card_t d_hand[MAX];

  srand((unsigned int)time(NULL));

  int i;
  for(i=0;i<2;i++) {          /*loop twice because at the start of blackjack, each player is given two cards*/
    generate_card(&p_hand[i], &p_numofcards, &p_score);
    generate_card(&d_hand[i], &d_numofcards, &d_score);
  }

  /* test */
  printf("p_score=&#37;d, p_numofcards=%d\n", p_score, p_numofcards);
  printf("d_score=%d, d_numofcards=%d\n", d_score, d_numofcards);
int k;
  for(k=0;k<2;k++) {
    printf("p_hand[%d].card=%d,"
           " p_hand[%d].suit=%d, "
           " p_hand[%d].value=%d\n",
            k,p_hand[i].card,
            k,p_hand[i].suit,
            k,p_hand[i].value
           );

  printf("d_hand[%d].card=%d,"
         " d_hand[%d].suit=%d,"
         " d_hand[%d].value=%d\n",
          k,d_hand[i].card,
          k,d_hand[i].suit,
          k,d_hand[i].value
        );
  }

  return 0;
}

void generate_card(card_t *crd, int *num, int *score) {

  /* crd = (card_t *)malloc(MAX*sizeof(card_t)); */

  crd->card = (rand() % 13) + 1;
  crd->suit = (rand() % 4) + 1;
  int c;
  for(c=1;c<11;c++) {   
    if(crd->card == c) {  /*if card is 1-10 (ace- 10) then let the value of the card be whatever it is*/
      crd->value = c;       
      (*score)+=c;              /*adds to the score (eg. 10 of hearts would add a 10) */
      (*num)++;                 /*increments the number of cards in the players' hand*/
    }
  }
  switch(crd->card) {
    case 11: case 12: case 13:            /* if card is jack, queen or king...*/
      crd->value = 10;
      (*score)+=10; 
      (*num)++;   
      break;
  }

  /*free(crd);*/
}

Let me explain a few things. The card_t type represents with the following attributes: card( 1-13 for ace-king), suit(1-4 for hearts, clubs etc), value( ace=1, jack=10, queen=10 and so on). The generate_card function is supposed to generate a random card to simulate the dealer dealing unkown cards to the participants of the game. The program compiles but outputs rather absurd data:

Code:

$ gcc -o bjack bjack.c
$ ./bjack
p_score=8, p_numofcards=2
d_score=8, d_numofcards=2
p_hand[0].card=0, p_hand[0].suit=0,  p_hand[0].value=0
d_hand[0].card=0, d_hand[0].suit=134513052, d_hand[0].value=24641422
p_hand[1].card=0, p_hand[1].suit=0,  p_hand[1].value=0
d_hand[1].card=0, d_hand[1].suit=134513052, d_hand[1].value=24641422

Another run to show it is producing random cards correctly:

Code:

$ ./bjack
p_score=11, p_numofcards=2
d_score=6, d_numofcards=2
p_hand[0].card=0, p_hand[0].suit=0,  p_hand[0].value=0
d_hand[0].card=0, d_hand[0].suit=134513052, d_hand[0].value=24641422
p_hand[1].card=0, p_hand[1].suit=0,  p_hand[1].value=0
d_hand[1].card=0, d_hand[1].suit=134513052, d_hand[1].value=24641422

Any help would be much appreciated, thanks.