Page 48 - DCAP605_ADVANCED_DATA_STRUCTURE_AND_ALGORITHMS

Unit 2: Linked Lists

Notes

Lab Exercise Program: Here is a program for building and printing the elements of the
circular linked list.
# include <stdio.h>
# include <stdlib.h>
struct node
{
int data;
struct node *link;
};
struct node *insert(struct node *p, int n)
{
struct node *temp;
/* if the existing list is empty then insert a new node as the
starting node */
if(p==NULL)
{
p=(struct node *)malloc(sizeof(struct node)); /* creates new
node data value passes
as parameter */
if(p==NULL)
{
printf(“Error\n”);
exit(0);
}
p-> data = n;
p-> link = p; /* makes the pointer pointing to itself because it
is a circular list*/
}
else
{
temp = p;
/* traverses the existing list to get the pointer to the last node of
it */
while (temp-> link != p)
temp = temp-> link;
temp-> link = (struct node *)malloc(sizeof(struct node)); /*
creates new node using
data value passes as
parameter and puts its
address in the link field
of last node of the
existing list*/

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