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68 changes: 68 additions & 0 deletions LINKED LIST/reverse_linkedlist.c
Original file line number Diff line number Diff line change
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// Iterative C program to reverse a linked list
#include <stdio.h>
#include <stdlib.h>


struct Node {
int data;
struct Node* next;
};


static void reverse(struct Node** head_ref)
{
struct Node* prev = NULL;
struct Node* current = *head_ref;
struct Node* next = NULL;
while (current != NULL) {
// Store next
next = current->next;

// Reverse current node's pointer
current->next = prev;

// Move pointers one position ahead.
prev = current;
current = next;
}
*head_ref = prev;
}

/* Function to push a node */
void push(struct Node** head_ref, int new_data)
{
struct Node* new_node
= (struct Node*)malloc(sizeof(struct Node));
new_node->data = new_data;
new_node->next = (*head_ref);
(*head_ref) = new_node;
}

/* Function to print linked list */
void printList(struct Node* head)
{
struct Node* temp = head;
while (temp != NULL) {
printf("%d ", temp->data);
temp = temp->next;
}
}

/* Driver code*/
int main()
{
/* Start with the empty list */
struct Node* head = NULL;

push(&head, 20);
push(&head, 4);
push(&head, 15);
push(&head, 85);

printf("Given linked list\n");
printList(head);
reverse(&head);
printf("\nReversed linked list \n");
printList(head);
getchar();
}