Setting an element of an array equal to an entire array c++

Question

I am creating a deck of bingo cards. The deck knows the amount of cards in the deck, the size of the cards, and the max number to appear on the card.

I want to create n arrays (cards) of unique random integers and then add each of these arrays to each element of another array (the deck). So, an array of arrays.

Ex.

card1 = {1, 2, 5};
card2 = {3, 7, 2};
deck = {card1, card2};

Here is my code so far:

Deck::Deck(int cardSize, int cardCount, int numberMax){
    int randInt;
    int size = cardSize * cardSize;
    int deckArr[cardCount];
    for(int t = 0; t < cardCount; t++){
        int arr[size];
        for(int i = 0; i < size; i++){
            randInt = computeRandInt(numberMax, cardSize);
            if(arr[i] == 0) arr[i] = randInt;
            else if (randInt != arr[i-1]) arr[i] = randInt;
        }
        deckArr[t] = arr;
    }
}

I get the error invalid conversion from ‘int*’ to ‘int’. How do I declare my deck array to store these card arrays?

int deckArr[cardCount] -- int arr[size]; -- This is not valid C++. An array in C++ must be declared using a constant to denote the number of entries, not a variable. Use std::vector<int> instead. — PaulMcKenzie
– PaulMcKenzie, Commented Nov 19, 2017 at 23:19

Stephan Lechner · Accepted Answer · 2017-11-19 23:20:21Z

1

In C++, you can deal with arrays of arrays by means of nested vectors, e.g. a vector<vector<int>> for your deckArr. Note that deckArr should actually be a member of Deck (and not a local variable); Just slightly adapted your code to show the idea of nested vectors:

Deck::Deck(int cardSize, int cardCount, int numberMax){
    int randInt;
    int size = cardSize * cardSize;
    vector<vector<int>> deckArr(cardCount);
    for(int t = 0; t < cardCount; t++){
        vector<int> arr(size);
        for(int i = 0; i < size; i++){
            randInt = computeRandInt(numberMax, cardSize);
            if(arr[i] == 0) arr[i] = randInt;
            else if (randInt != arr[i-1]) arr[i] = randInt;
        }
        deckArr.push_back(arr);
    }
}

answered Nov 19, 2017 at 23:20

Stephan Lechner

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1 Comment

dustinos3 Over a year ago

Thank you. So how would I access the deck vector in another print function to print out each card?

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