How to initialize nested structures in C++

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i was trying to perform stack functions using nested structures. But i am facing problem initializing the stack.

its the problem with the initialize function of LinkList structure in the code given below.

Please help and let me know what can i do to run this code completely.

thanks in advance

CODE:

#include<iostream>

using namespace std;

class stack{
    struct ch;
    ch * ptr;

    public:
        void initialize();
        void push(int *);
        int* pop();
        int* peek();
};


struct stack::ch{
    struct LinkList{
        int * data;
        LinkList * next;
        void initialize(int* dat, ch* nxt);
    }*head;
};

/*this is where i am facing problem*/
void stack::ch::LinkList::initialize(int *dat, ch *nxt){
        data = dat;
        if(nxt->head)   //as i cannot access head of nxt,so code is crashing 
        next = nxt->head;
        else
            next = 0;
    }

    void stack::initialize()
    {
        ptr = 0;

    }

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

    int* stack::pop()
    {
        if(ptr == 0)
            return 0;
        ch::LinkList* oldHead = ptr->head;
        ptr->head = ptr->head->next;
        int * dat = oldHead->data;
        delete oldHead;
        return dat;
    }

    int* stack::peek()
    {
        if(ptr->head == 0)
            return 0;
        return ptr->head->data;
    }

    int main()
    {
        stack obj;
        obj.initialize();
        int a = 10;
        int b  = 11;
        int c  = 12;
        int d  = 13;
        obj.push(&a);
        obj.push(&b);
        obj.push(&c);
        obj.push(&d);

        int *f;
        while((f = obj.pop())!=0)
        {
            cout<<*(obj.peek())<<endl;
            //obj.pop();
        }           

return 0;
}

asked 1 min ago

Ravender Singh Dahiya

1

How to initialize nested structures in C++