Problems with random generation and counting
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Thread: Problems with random generation and counting

  1. #1
    Join Date
    Apr 2010
    Posts
    2

    Problems with random generation and counting

    The problem is to have the computer is picking individual cards from a full deck that is shuffled after each pick (therefore cards can be picked more than once)
    The Goal is to end up with one card of each suit, and to tell the user how many picks it took

    Sample output:
    Queen of Spades
    5 of Clubs
    Queen of Hearts
    4 of Diamonds
    Number of Picks: 12

    So far, i have been able to generate 4 random cards, but am unable to convince the program to stop and reset for the next card,
    In addition, the counter for the number of picks is presenting problems.

    Thank you for any suggestions, and my code is below (compiled in Visual C++ 2008 express edition)


    #include <iostream>
    #include <string>
    #include <ctime>
    using namespace std;

    const int Cards = 52;

    // Shuffle the elements in an array
    void shuffle(int list[], int size)
    {
    srand(time(0));
    for (int i = 0; i < size; i++)
    {
    // Generate an index randomly
    int index = rand() % Cards;
    int temp = list[i];
    list[i] = list[index];
    list[index] = temp;
    }
    }

    int main()
    {
    int deck[Cards];
    const string suits[] = {"Clubs", "Diamonds", "Hearts", "Spades"};
    const string ranks[] = {"Ace", "2", "3", "4", "5", "6", "7", "8",
    "9", "10", "Jack", "Queen", "King"};

    // Initialize cards
    for (int i = 0; i < Cards; i++)
    deck[i] = i;


    // Shuffle the cards
    shuffle(deck, Cards);

    // Display cards
    //Card 1
    for (int i = 0; i < 1; i++)
    {
    cout << ranks[deck[i] % 13] << " of "
    << suits[deck[i] / 13] << endl;
    }
    //Card 2
    for (int i = 1; i < 2; i++)
    {
    cout << ranks[deck[i] % 13] << " of "
    << suits[deck[i] / 13] << endl;
    }
    //Card 3
    for (int i = 2; i < 3; i++)
    {
    cout << ranks[deck[i] % 13] << " of "
    << suits[deck[i] / 13] << endl;
    }
    //Card 4
    for (int i = 3; i < 4; i++)
    {
    cout << ranks[deck[i] % 13] << " of "
    << suits[deck[i] / 13] << endl;
    }

    return 0;
    }

  2. #2
    Lindley is offline Elite Member Power Poster
    Join Date
    Oct 2007
    Location
    Fairfax, VA
    Posts
    10,885

    Re: Problems with random generation and counting

    Common mistake. Never call srand() more than once in a program. Just stick it at the top of main(), and don't call it anywhere else.

  3. #3
    Join Date
    Apr 2010
    Posts
    2

    Re: Problems with random generation and counting

    With the current code, the result is 4 random cards, however, im still having trouble telling the program that once it finds one particular suit, to reshuffle the deck and find another separate suit, while still counting! and i will fix the srand()
    Thanks!

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