Dynamic Stack

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Defining structure of node for the linked stack, Defining member function PUSH() - to push a node to the stack which is allocated dynamically, POP() - to remove a node from the stack and release the memory.

Stack is a linear data structure in which insertion and deletion of elements takes place only one end known as TOP.

#include<iostream.h>
#include<conio.h>

struct node
{
  int data;
  node *next;
};

class stack
{
      node *top;
public :
      stack()
      { top=NULL;}
       void push();
       void pop();
       void display();
      ~stack();
};

void stack::push()
{
      node *temp;
      temp=new node;
      cout<<"Enter data :";
      cin>>temp->data;
      temp->next=top;
      top=temp;
}

void stack::pop()
{
      if(top!=NULL)
      {
            node *temp=top;
            top=top->next;
            cout<<temp->data<<"deleted";
            delete temp;
      }
      else
            cout<<"Stack empty";
}

void stack::display()
{
      node *temp=top;
      while(temp!=NULL)
      {
        cout<<temp->data<<" ";
        temp=temp->next;
      }
}

stack::~stack()
{
      while(top!=NULL)
      {
            node *temp=top;
            top=top->next;
            delete temp;
      }
}

void main()
{
      stack st;
      char ch;
      do
      {
            cout<<"stack options\nP for push \nO for Pop \nD for Display \nQ for quit";
            cin>>ch;
            switch(ch)
            {
                  case 'P': st.push();break;
                  case 'O': st.pop();break;
                  case 'D': st.display();break;
            }
      }while(ch!='Q');
}

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