Dynamic Stack (Menu Driven)

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
struct node
{
    int t_no;
    char p_name[50];
    node *link;
};

node *temp=NULL;
node *top=NULL;

void insert()
{
    clrscr();
    temp=new node;
    cout<<"\n Enter ticket no.: ";
    cin>>temp->t_no;
    cout<<" Enter passenger name: ";
    gets(temp->p_name);
    temp->link=top;
    top=temp;
    cout<<"\n Insert Successful!";
    cout<<"\n Press any key to continue...";
    getch();
}
void display()
{
    clrscr();
    if(top==NULL)
    cout<<"\n The stack is empty!";
    else
    {
        temp=top;
        while(temp!=NULL)
        {
            cout<<"\n Ticket no.: "<<temp->t_no;
            cout<<"\n Passenger name: ";
            puts(temp->p_name);
            temp=temp->link;
        }
    }
    cout<<"\n Press any key to continue...";
    getch();
}
void delete_node()
{
    clrscr();
    if(top==NULL)
    cout<<"\n The stack is empty!";
    else
    {
        temp=top;
        top=top->link;
        cout<<"\n Deleted the following record: ";
        cout<<"\n Ticket no.: "<<temp->t_no;
        cout<<"\n Passenger name: ";
        puts(temp->p_name);
        delete temp;
    }
    cout<<"\n Press any key to continue...";
    getch();
}
void main()
{
    clrscr();
    int choice;
    while(1)
    {
        clrscr();
        cout<<"\n\t\t\tMain Menu\n\t1.Insert\n\t2.Display\n\t3.Delete\n\t4.Exit";
        cout<<"\n Enter your choice: ";
        cin>>choice;
        switch(choice)
        {
            case 1:
                insert();
                break;

            case 2:
                display();
                break;

            case 3:
                delete_node();
                break;

            case 4:
                exit(0);
        }
    }
}