[Solved] How to initialize nested structures in C++

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You should debug your code by yourself.

void stack::push(int *dat)
{
    ch::LinkList* newNode = new ch::LinkList;
    newNode->initialize(dat,ptr);
    ptr->head = newNode;    
}

void stack::ch::LinkList::initialize(int *dat, ch *nxt){
    data = dat;
    if(nxt->head)    
        next = nxt->head;
    else
        next = 0;
}

Note that: ptr is nullptr,so nxt is a nullptr too.
So you crash…
make ptr not null, and fix your pop function bugs, that will ok.

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solved How to initialize nested structures in C++