How to copy all the things in linked list paste them into a

How to copy all the things in linked list, paste them into a not empty file and delete all the things the file used had?

in C

thanks.

Solution

#include<stdio.h>

#include<stdlib.h>

struct node

{

int data;

struct node *next;

};

void removeDuplicates(struct node *start)

{

  struct node *ptr1, *ptr2, *dup;

  ptr1 = start;

  while(ptr1 != NULL && ptr1->next != NULL)

  {

     ptr2 = ptr1;

     while(ptr2->next != NULL)

     {

       if(ptr1->data == ptr2->next->data)

       {

          dup = ptr2->next;

          ptr2->next = ptr2->next->next;

          free(dup);

       }

       Else

       {

          ptr2 = ptr2->next;

       }

     }

     ptr1 = ptr1->next;

  }

}

void push(struct node** head_ref, int new_data);

void printList(struct node *node);

int main()

{

  struct node *start = NULL;

  push(&start, 10);

  push(&start, 11);

  push(&start, 12);

  push(&start, 11);

  push(&start, 11);

  push(&start, 12);

  push(&start, 10);

  printf(\"\ Linked list before removing duplicates \");

  printList(start);

  removeDuplicates(start);

  printf(\"\ Linked list after removing duplicates \");

  printList(start);

  getchar();

}

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;

}

void printList(struct node *node)

{

  while(node != NULL)

  {

    printf(\"%d \", node->data);

    node = node->next;

  }

}