Linked Stack Using class

[thecodeinnovator]

I have made this program to illustrate the concept of Linked Stack

//Push & Pop in Linked Stack
//class and typedef implementation
#include <iostream>

using namespace std;

class stack
{
private:
	typedef struct node
	{
		int info;
		node* next;
	}* nptr;
	nptr top,save,ptr;
public:	
	stack()
	{
		top=NULL;
		save=NULL;
		ptr=NULL;
	}
	nptr create(int n)
	{
		ptr=new node;
		ptr->info=n;
		ptr->next=NULL;
		return ptr;
	}
	void push(nptr np)
	{
		if(np==NULL)
		{
			cout<<"\nOVERFLOW !!!\nABORTING !!!\n";
			exit(1);
		}
		else
		{
			if(top==NULL)
				top=np;
			else
			{
				save=top;
				top=np;
				np->next=save;
			}
		}
	}
	void pop()
	{
		if(top==NULL)
		{
			cout<<"\nUNDERFLOW !!!\nABORTING !!!\n";
			exit(1);
		}
		else
		{
			ptr=top;
			top=top->next;
			delete ptr;
		}
	}
	void display(nptr np);
	nptr topout()
	{
		return top;
	}
	int delout()
	{
		return top->info;
	}
	~stack()
	{
		cout<<"\n\nTHANKYOU FOR USING THIS APPLICATION !!!\n";
	}
};

stack s;

void stack::display(nptr np)
{
	cout<<"\nThe Stack Now is : ";
	cout<<"\n"<<np->info<<"<-";
	while(np!=NULL)
	{
		np=np->next;
		cout<<"\n"<<np->info;
	}
	cout<<"\n!!!";
}

void printhead()
{
	clrscr();
	cout<<"\n\t\tLinked List";
	cout<<"\n\t\t****** ****";

}

void printfoot()
{
	clrscr();
	cout<<"\n\t\tPRESS 1 TO GO TO MAIN MENU";
	cout<<"\n\t\tPRESS 0 TO EXIT APPLICATION\n";
}

void insert()
{
	int a;
	char c='y';
	cout<<"\n\tInsertion into Stack : ";
	cout<<"\n\t--------- ---- -----";
	while((c=='y')||(c=='Y'))
	{
		cout<<"\nEnter Info for Node : ";
		cin>>a;
		s.push(s.create(a));
		s.display(s.topout());
		cout<<"\nPress 'Y' for more nodes : ";
		cin>>c;
	}
}

void remove()	
{	
	char c='y';
	cout<<"\n\tDeletion from Stack : ";
	cout<<"\n\t-------- ---- -----";
	while((c=='y')||(c=='Y'))
	{
		cout<<"\nPop ?(Y/N) : ";
		cin>>c;
		if((c=='Y')||(c=='y'))
		{
			cout<<"\nThe Element to be Deleted is : "<<s.delout();
			s.pop();
		}
		s.display(s.topout());
	}
}

void main()
{
	char ch;
	clrscr();
	menu:
		printhead();
		cout<<"\n1.Insertion into Stack";
		cout<<"\n2.Deletion from Stack";
		cout<<"\n3.Exit";
		cout<<"\nEnter Choice : ";
		cin>>ch;
		switch(ch)
		{
			case 1:
				insert();
				break;
			case 2:
				remove();
				break;
			case 3:
				goto quit;
			default:
				goto menu;
		}
		printfoot();
	quit:
		getch();
}