C语言编程-随机抽取扑克

Enter number of cards in hand:52

Your in_hands:D2 S7 D6 D7 H5 C5 Da Hj Dk C4 D8 Sq Cq S2 Hk C6 H3 Sa H4 Dj Ct Hq
S9 Sj H6 C3 Cj D3 H9 D4 St C7 D5 Ck C8 C9 H2 Ha D9 Dt Ht H8 S5 Ca S8 Sk S3 H7 S4
Dq C2 S6

    #define NUM_SUITS 4 //花色
    #define NUM_RANKS 13 //牌序
    char in_hands[NUM_SUITS][NUM_RANKS]={false};
    int num_cards=0,rank=0,suit=0;
    const char suit_code[]={'C','D','H','S'};
    const char rank_code[]={'2','3','4','5','6','7','8','9','t','j','q','k','a'};
    
    srand((unsigned) time(NULL));
    printf("Enter number of cards in hand:");scanf("%d",&num_cards);
    printf("Your in_hands:");
    
    while(num_cards>0)
    {
        suit=rand() % NUM_SUITS;
        rank=rand() % NUM_RANKS;
        if(in_hands[suit][rank]==false) //没发过
        {
           in_hands[suit][rank]=true; 
           num_cards--;
           printf("%c%c ",suit_code[suit],rank_code[rank]);
        }
        else
        ;
    }