Blackjack

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

int suit0();
int num0();
int draw(int suit, int num);

int main(void) {
  char hs;
  int suit, num;
  srand((unsigned) time(NULL));
  do {
    printf("Hit or Stand?(h/s):");
    scanf(" %c", &hs);
    switch (hs) {
    case 'h':
      while(1) {
        suit = suit0();
        num = num0();
        if (!draw(suit, num)) break;
      }
      if (suit == 1)
        printf("S");
      else if (suit == 2)
        printf("H");
      else if (suit == 3)
        printf("C");
      else
        printf("D");

      if (num == 1)
        printf("A\n");
      else if (num == 11)
        printf("J\n");
      else if (num == 12)
        printf("Q\n");
      else if (num == 13)
        printf("K\n");
      else
        printf("%d\n", num);
      break;
    case 's':
      return 0;
    default:
      printf("hかsを入力してください。\n");
      break;
    }
  } while (hs != 's');
  return 0;
}

int suit0(void) {
  return rand() % 4 + 1;
}

int num0(void) {
  return rand() % 13 + 1;
}

int draw(int suit0, int num0) {
  static int sn[4][13] = {
      { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
      { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
      { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
      { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
  };
  if (sn[suit0][num0] > 0)
    return 1;
  else {
    sn[suit0][num0]++;
    return 0;
  }
}