Create a Doubly linked list by R4R Team

Doubly Linked list:
A linked list in which every Node have a access of both next Node and previous Node.

Total Field in Doubly Linked List:
data : To store data
previous : To point to previous Node
next : To point next Node

Now create and traverse the doubly linked list:

program-

#include< stdio.h>
#include< conio.h>
#include< alloc.h>
struct node{
struct node *pre;
struct node *next;
int data;
};
struct node *first=NULL,*last=NULL;

void traverse()
{
struct node *ptr;
ptr=first;
while(ptr!=NULL){
printf("%d ",ptr->data);
ptr=ptr->next;
}
}

void main()
{
struct node *cpt,*ptr;
char ch;
clrscr();
first=(struct node*)malloc(sizeof(struct node));
printf("Enter first element in Linklist\n");
scanf("%d",&first->data);
first->pre=NULL;
ptr=first;
do
{
cpt=(struct node*)malloc(sizeof(struct node));
printf("Enter another data\n");
scanf("%d",&cpt->data);
ptr->next=cpt;
cpt->pre=ptr;
ptr=ptr->next;
printf("Continue(y/n)?");
ch=getch();
}while(ch=='y');
ptr->next=NULL;
last=ptr;
printf("nDoubly Linked-list is\n");
traverse();
getch();
}


output-

Enter first element in Linklist
4
Enter another data
5
Continue(y/n)?
Enter another data
1
Continue(y/n)?
Enter another data
9
Continue(y/n)?
Enter another data
0
Continue(y/n)?
Doubly Linked-List is
4 5 1 9 0

-In this program, we have a traverse() function that print all item of the doubly Linked list.




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