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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <stdbool.h>
  4.  
  5. typedef struct sllist
  6. {
  7.     int data;
  8.     struct sllist *next;
  9. }
  10. sllnode;
  11.  
  12. // initially creating the first node of the Singly Linked List
  13. void create(sllnode *head, int elem)
  14. {
  15.     head -> data = elem;
  16.     head -> next = NULL;
  17. }
  18.  
  19. // inserting a node
  20. void insert( sllnode *head, int elem, int position )
  21. {
  22.     if ( head == NULL )
  23.     {
  24.         printf("NULL returned \n");
  25.         exit(0);
  26.     }
  27.     // this overrides the very first node if already created through create function
  28.     if( position == 0 )
  29.     {
  30.         head -> data = elem;
  31.         head -> next = NULL;
  32.     }
  33.     else
  34.     {
  35.         sllnode *temp = head;
  36.         for ( int i = 0; i < position - 1; ++i )
  37.         {
  38.             temp = temp -> next;
  39.         }
  40.  
  41.         sllnode *new_node = malloc( sizeof(sllnode) );
  42.         new_node -> data = elem;
  43.         new_node -> next = NULL;
  44.  
  45.         temp -> next = new_node; // this is working here, unline the previous program I have shared. I am not using a pointer to pointer here. But it still works unline previous program.
  46.     }
  47. }
  48.  
  49. // print the entire linked list
  50. void display(sllnode *head)
  51. {
  52.     sllnode *temp = head;
  53.     if ( head == NULL )
  54.     {
  55.         printf("NULL returned\n");
  56.         exit(0);
  57.     }
  58.  
  59.     while( temp != NULL )
  60.     {
  61.         printf("%d \n", temp -> data);
  62.         temp = temp -> next;
  63.     }
  64. }
  65.  
  66.  
  67. // main function
  68. int main(void)
  69. {
  70.     sllnode *head = malloc( sizeof(sllnode) );
  71.     create(head,23);
  72.     insert(head, 13, 0);
  73.     insert(head, 15, 1);
  74.     insert(head, 45, 2);
  75.     display(head);
  76. }
Success #stdin #stdout 0s 9424KB
comments (?)
stdin 
Standard input is empty
stdout 
13 
15 
45
https://ideone.com/SRVSEJ
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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