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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.             for ( int i = 0; i < position - 1; ++i )
  36.             {
  37.                 head = head -> next;
  38.             }
  39.  
  40.             sllnode *new_node = malloc( sizeof(sllnode) );
  41.             new_node -> data = elem;
  42.             new_node -> next = NULL;
  43.  
  44.             head -> 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.
  45.         }
  46.     }
  47.  
  48.     // print the entire linked list
  49.     void display(sllnode *head)
  50.     {
  51.         sllnode *temp = head;
  52.         if ( head == NULL )
  53.         {
  54.             printf("NULL returned\n");
  55.             exit(0);
  56.         }
  57.  
  58.         while( temp != NULL )
  59.         {
  60.             printf("%d \n", temp -> data);
  61.             temp = temp -> next;
  62.         }
  63.     }
  64.  
  65.  
  66.     // main function
  67.     int main(void)
  68.     {
  69.         sllnode *head = malloc( sizeof(sllnode) );
  70.         create(head,23);
  71.         insert(head, 13, 0);
  72.         insert(head, 15, 1);
  73.         insert(head, 45, 2);
  74.         display(head);
  75.     }
  76.  
Success #stdin #stdout 0s 4340KB
comments (?)
stdin 
Standard input is empty
stdout 
13 
15 
45
https://ideone.com/F8cpIO
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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