randomize array blackjack c program

This is a discussion on randomize array blackjack c program within the C Programming forums, part of the General Programming Boards category; Hi guys i have the following code... The char * deckOfCards[DECK_SIZE] is an array which holds a deck of 52 ...

  1. #1
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    randomize array blackjack c program

    Hi guys i have the following code... The char * deckOfCards[DECK_SIZE] is an array which holds a deck of 52 cards.

    How would i use my shuffle deck function to randomize the strings in the array. So then it randomly picks 3s or 3h (3 hearts) intead of just randomizing an int from 1-11. How would i randomize 52 strings of cards in that function.






    Code:
                       
    void blackjackGame()
    {
       /* Spades, Clubs, Diamonds, Hearts. */
      char* deckOfCards[DECK_SIZE] = {"2S",   "2C",   "2D",   "2H",
                                       "3S",   "3C",   "3D",   "3H",
                                       "4S",   "4C",   "4D",   "4H",
                                       "5S",   "5C",   "5D",   "5H",
                                       "6S",   "6C",   "6D",   "6H",
                                       "7S",   "7C",   "7D",   "7H",
                                       "8S",   "8C",   "8D",   "8H",
                                       "9S",   "9C",   "9D",   "9H",
                                       "10S",  "10C",  "10D",  "10H",
                                       "JS",   "JC",   "JD",   "JH",
    
                                       "QS",   "QC",   "QD",   "QH", 
    
                                     "KS",   "KC",   "KD",   "KH", 
                                    "AS",   "AC",   "AD",   "AH"};* 
    
    int player1Total,
    int  player2Total;       /* Hold totals per hand */
    int  playerLost;        /* Used as flag    */     
    char reply;           /* Holds user input     */
    
    
    
     do
       {                      /* Begin Hand */
          player1Total=0;
          player2Total=0;
          playerLost = NO;
          printf("\nBlackJack21\n\n");
       }
       while((reply != 's') && (playerLost == NO))
    
    
    }
    
    /* this is a function used to randomize the array of 
    cards char* deckofCards(DECK_SIZE) */
    
    shuffledeck()
    {
    
          for(i=0;i<1;++i)   /* Deal ONE  card */
          {
    	 player1Card = (1+rand()%11);
    	 printf("Your card is %d\n",player1Card);
    	 playerTotal += player1Card; 
         }
    
    }

  2. #2
    and the hat of wrongness Salem's Avatar
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    A very simple shuffle swaps two cards over

    Code:
    temp = deckOfCards[2];
    deckOfCards[2] = deckOfCards[20];
    deckOfCards[20] = temp;
    Now do that a number of times, picking two random spots in the array.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. #3
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    random strings

    But the project guidlines are to generate a random string of that array. How could that possible be done?

  4. #4
    and the hat of wrongness Salem's Avatar
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    You shuffle the deck.

    Then to draw 5 cards you look at deckOfCards[0] to deckOfCards[4]
    To draw another 5 cards, you look at deckOfCards[5] to deckOfCards[9]

    A simple counter
    int numCardsDrawnFromDeck;
    will keep a count of which cards you dealt.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  5. #5
    Frequently Quite Prolix dwks's Avatar
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    Code:
      char* deckOfCards[DECK_SIZE] = {"2S",   "2C",   "2D",   "2H",
                                       "3S",   "3C",   "3D",   "3H",
                                       "4S",   "4C",   "4D",   "4H",
                                       "5S",   "5C",   "5D",   "5H",
                                       "6S",   "6C",   "6D",   "6H",
                                       "7S",   "7C",   "7D",   "7H",
                                       "8S",   "8C",   "8D",   "8H",
                                       "9S",   "9C",   "9D",   "9H",
                                       "10S",  "10C",  "10D",  "10H",
                                       "JS",   "JC",   "JD",   "JH",
    
                                       "QS",   "QC",   "QD",   "QH", 
    
                                     "KS",   "KC",   "KD",   "KH", 
                                    "AS",   "AC",   "AD",   "AH"};*
    You don't need DECK_SIZE, although you can leave it in if you want to. And what's that asterick doing there?

    A simple counter
    int numCardsDrawnFromDeck;
    will keep a count of which cards you dealt.
    Adding to this, if numCardsDrawnFromDeck is the same as DECK_SIZE, the deck needs to be re-dealt.
    dwk

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