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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3.  
  4. struct dll{
  5.     int data;
  6.     struct dll* previous;
  7.     struct dll* next;
  8. };
  9.  
  10.  
  11. struct dll* insertAtBeginning(int a, struct dll* head){
  12.  
  13.     if(head == NULL){
  14.         head->data = a;
  15.         head->previous = NULL;
  16.         head->next = NULL;
  17.         return head;
  18.     }
  19.     else{
  20.         struct dll *first;
  21.         first = (struct dll*) malloc( sizeof(struct dll));
  22.         first->data = a;
  23.         first->next = head;
  24.         head->previous = first;
  25.         first->previous = NULL;
  26.         head = first;
  27.       // free(first);
  28.         return head;
  29.     }
  30. }
  31.  
  32.  
  33. void display_from_first(struct dll* head){
  34.     struct dll *temp;
  35.     temp = head;
  36.  
  37.     printf("\nThe linked list contains: ");
  38.     while(temp != NULL) {
  39.         printf("%d------>",temp->data);
  40.         temp = temp->next;
  41.     }
  42.     printf("NULL\n");
  43.     free(temp);
  44.     }
  45.  
  46.  
  47. int main(){
  48.     int i = 0;
  49.     struct dll *head1, *tail1;
  50.     head1 = (struct dll*) malloc( sizeof(struct dll));
  51.     head1->next = NULL;
  52.     head1->previous = NULL;
  53.  
  54.     for(i=0; i<10; i++){
  55.        head1= insertAtBeginning(i, head1);
  56.     }
  57.  
  58.     display_from_first(head1);
  59.  
  60.     return 0;
  61. }
Success #stdin #stdout 0s 2184KB
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stdin
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Standard input is empty
stdout
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The linked list contains: 9------>8------>7------>6------>5------>4------>3------>2------>1------>0------>0------>NULL
https://ideone.com/nXwc8z
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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