Im trying to increase a dynamic array by 1 element and assign a integer variable to it but recieve
a heap overload error.
Any advice would be appreciated.

void CardSet::AddCard(int cardNum)
    int* tmp; 

    tmp = new int[nCards];

    for(int i = 0; i < (nCards - 1); i++)
        tmp[i] = Card[i];

    delete [] Card;
    Card = tmp;
    Card[nCards] = cardNum;

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Card[nCards] is one beyond the array definition. Since you allocated nCards integers, your last available value is Card[nCards-1].

thank you

maybe line 6 should have been this: tmp = new int[nCards+1];

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