Program - 5.c

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>

struct node
{
  int empid;
  char name[15];
  struct node *nxt;
  struct node *pre;
} * last, *newnode, *postnode, *ptr;

void addfront()
{
  if (last == NULL)
  {
    last = (struct node *)malloc(sizeof(struct node));
    printf("Enter Employee ID : ");
    scanf("%d", &last->empid);
    printf("Enter Name : ");
    scanf("%s", &last->name);
    last->nxt = NULL;
    last->pre = NULL;
    postnode = last;
  }
  else
  {
    newnode = (struct node *)malloc(sizeof(struct node));
    printf("\nEnter Employee ID : ");
    scanf("%d", &newnode->empid);
    printf("Enter Name : ");
    scanf("%s", &newnode->name);
    newnode->nxt = postnode;
    postnode->pre = newnode;
    newnode->pre = NULL;
    postnode = newnode;
  }
}

void displaycircularlist()
{
  if (last == NULL)
  {
    printf("--------------------------------------\n");
    printf("List is empty\n");
    printf("--------------------------------------\n");
  }
  else
  {
    int i = 1;
    ptr = postnode;
    printf("\n\nDoubly Linked list is :-\n\n");
    printf("-------------------------------------------------------\n");
    do
    {
      printf("Node - %d : Employee ID - %d", i, ptr->empid);
      printf("\n         : Name - %s", ptr->name);
      printf("\n         : Address - %d", ptr);
      printf("\n         : Next - %d \n", ptr->nxt);
      printf("-------------------------------------------------------\n");
      ptr = ptr->nxt;
      i++;
    } while (ptr != NULL);
  }
}

int deleteend()
{
  if (last == NULL)
  {
    printf("--------------------------------------\n");
    printf("List is empty\n");
    printf("--------------------------------------\n");
    return 0;
  }
  else
  {
    if (last->pre == NULL)
    {
      last = NULL;
    }
    else
    {
      ptr = last->pre;
      ptr->nxt = NULL;
      last = ptr;
    }
    printf("\n-------------------------------------------\n");
    printf("Deleted Successfully.");
    printf("\n-------------------------------------------\n");
  }
}

void main()
{
  int choice;
  printf("\n\t -: Employee Information :-");
  do
  {
    printf("\n\n-------------------------------------------\n");
    printf("\t\t-: Menu :-\n");
    printf("-------------------------------------------\n\n");
    printf("1. Add Node at Front\n2. Display doubly linked List\n");
    printf("3. Delete Node from End\n4. Exit\n");
    printf("\nEnter choice no. : ");
    scanf("%d", &choice);
    switch (choice)
    {
    case 1:
      addfront();
      printf("\n-------------------------------------------\n");
      printf("Added Successfully.");
      printf("\n-------------------------------------------\n");
      break;
    case 2:
      displaycircularlist();
      break;
    case 3:
      deleteend();
      break;
    case 4:
      break;
    default:
      printf("\nPlease enter valid choice number !!!");
    }
  } while (choice != 4);
  printf("\nPress any key to EXIT ...");
  getch();
}