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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <time.h>
  4.  
  5. #define DECK_SIZE 52
  6. #define MAX_HAND 12
  7.  
  8. typedef struct {
  9.     int suit;   // 0-3
  10.     int value;  // 1-13 (A=1, JQK=11-13)
  11. } Card;
  12.  
  13. /* 関数宣言 */
  14. void init_deck(Card deck[]);
  15. void shuffle(Card deck[]);
  16. Card draw(Card deck[], int *pos);
  17. int hand_value(Card hand[], int count);
  18. void print_hand(const char *name, Card hand[], int count);
  19.  
  20. /* メイン */
  21. int main(void) {
  22.     Card deck[DECK_SIZE];
  23.     Card player[MAX_HAND], dealer[MAX_HAND];
  24.     int deck_pos = 0;
  25.     int p_count = 0, d_count = 0;
  26.     char choice;
  27.  
  28.     srand((unsigned)time(NULL));
  29.  
  30.     init_deck(deck);
  31.     shuffle(deck);
  32.  
  33.     /* 最初に2枚ずつ配る */
  34.     player[p_count++] = draw(deck, &deck_pos);
  35.     player[p_count++] = draw(deck, &deck_pos);
  36.     dealer[d_count++] = draw(deck, &deck_pos);
  37.     dealer[d_count++] = draw(deck, &deck_pos);
  38.  
  39.     /* プレイヤーのターン */
  40.     while (1) {
  41.         print_hand("Player", player, p_count);
  42.         printf("Player total: %d\n", hand_value(player, p_count));
  43.  
  44.         if (hand_value(player, p_count) > 21) {
  45.             printf("Player bust! You lose.\n");
  46.             return 0;
  47.         }
  48.  
  49.         printf("Hit? (y/n): ");
  50.         scanf(" %c", &choice);
  51.  
  52.         if (choice == 'y') {
  53.             player[p_count++] = draw(deck, &deck_pos);
  54.         } else {
  55.             break;
  56.         }
  57.     }
  58.  
  59.     /* ディーラーのターン */
  60.     while (hand_value(dealer, d_count) < 17) {
  61.         dealer[d_count++] = draw(deck, &deck_pos);
  62.     }
  63.  
  64.     /* 結果表示 */
  65.     print_hand("Dealer", dealer, d_count);
  66.     printf("Dealer total: %d\n", hand_value(dealer, d_count));
  67.  
  68.     int p = hand_value(player, p_count);
  69.     int d = hand_value(dealer, d_count);
  70.  
  71.     if (d > 21 || p > d) {
  72.         printf("You win!\n");
  73.     } else if (p < d) {
  74.         printf("You lose.\n");
  75.     } else {
  76.         printf("Draw.\n");
  77.     }
  78.  
  79.     return 0;
  80. }
  81.  
  82. /* 山札作成 */
  83. void init_deck(Card deck[]) {
  84.     int i = 0;
  85.     for (int s = 0; s < 4; s++) {
  86.         for (int v = 1; v <= 13; v++) {
  87.             deck[i].suit = s;
  88.             deck[i].value = v;
  89.             i++;
  90.         }
  91.     }
  92. }
  93.  
  94. /* シャッフル */
  95. void shuffle(Card deck[]) {
  96.     for (int i = 0; i < DECK_SIZE; i++) {
  97.         int j = rand() % DECK_SIZE;
  98.         Card tmp = deck[i];
  99.         deck[i] = deck[j];
  100.         deck[j] = tmp;
  101.     }
  102. }
  103.  
  104. /* 1枚引く */
  105. Card draw(Card deck[], int *pos) {
  106.     return deck[(*pos)++];
  107. }
  108.  
  109. /* 手札の合計（Aを1 or 11で調整） */
  110. int hand_value(Card hand[], int count) {
  111.     int sum = 0;
  112.     int ace = 0;
  113.  
  114.     for (int i = 0; i < count; i++) {
  115.         int v = hand[i].value;
  116.         if (v >= 10) sum += 10;
  117.         else if (v == 1) {
  118.             sum += 11;
  119.             ace++;
  120.         } else sum += v;
  121.     }
  122.  
  123.     while (sum > 21 && ace > 0) {
  124.         sum -= 10;
  125.         ace--;
  126.     }
  127.  
  128.     return sum;
  129. }
  130.  
  131. /* 手札表示 */
  132. void print_hand(const char *name, Card hand[], int count) {
  133.     printf("%s hand: ", name);
  134.     for (int i = 0; i < count; i++) {
  135.         int v = hand[i].value;
  136.         if (v == 1) printf("A ");
  137.         else if (v == 11) printf("J ");
  138.         else if (v == 12) printf("Q ");
  139.         else if (v == 13) printf("K ");
  140.         else printf("%d ", v);
  141.     }
  142.     printf("\n");
  143. }
Success #stdin #stdout 0.01s 5320KB
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stdin
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Standard input is empty
stdout
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Player hand: 5 10 
Player total: 15
Hit? (y/n): Dealer hand: 2 8 8 
Dealer total: 18
You lose.
https://ideone.com/pJIOai
language:
C (gcc 8.3)
created:
19 hours ago
visibility:
public

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