C Programming Code Examples
C > Linked Lists Code Examples
Find Item in Circular Linked List In C
/* Find Item in Circular Linked List In C */
#include <stdio.h>
#include <stdlib.h>
struct node {
int data;
struct node *next;
};
struct node *head = NULL;
struct node *current = NULL;
//insert link at the first location
void insert(int data) {
// Allocate memory for new node;
struct node *link = (struct node*) malloc(sizeof(struct node));
link->data = data;
link->next = NULL;
// If head is empty, create new list
if(head==NULL) {
head = link;
head->next = link;
return;
}
current = head;
// move to the end of the list
while(current->next != head)
current = current->next;
// Insert link at the end of the list
current->next = link;
// Link the last node back to head
link->next = head;
}
//display the list
void find_data(int item) {
int pos = 0;
if(head == NULL) {
printf("Linked List not initialized");
return;
}
current = head;
while(current->next != head) {
if(current->data == item) {
printf("%d found at position %d\n", item, pos);
return;
}
current = current->next;
pos++;
}
if(current->data == item) {
printf("%d found at position %d\n", item, pos);
return;
}
printf("%d does not exist in the list", item);
}
int main() {
insert(10);
insert(23);
insert(39);
insert(1);
insert(47);
insert(56);
find_data(56);
return 0;
}
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