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// linklist.cpp// linked listusing namespace std;struct link{        int data;        link* next;};class linklist {        private:                link* first;        public:                linklist() { first = NULL; }                void additem(int d);                void display();};void linklist::additem(int d) {        link* newlink = new link;        newlink->data = d;        newlink->next = first;        first = newlink;}void linklist::display(){        link* current = first;        while (current != NULL)        {                cout << current->data << endl;                current = current->next;        }}int main(void){        linklist li;        li.additem(25);        li.additem(36);        li.additem(49);        li.additem(64);        li.additem(13);        li.display();        return 0;}