Having in input a reference to the head of a linked list and value x, store the value x in a new node and set this node as new tails of the linked list

push_tail_single_linked_list.cpp

Node push_tail(Node *head, int x)
{
   Node *new_tail = new Node(x);
   new_tail->next = NULL; 
   
   if(head == NULL)
      return new_tail;
   else
   {
     Node *current =head;
     // Iterate until the last node 
     while(current->next != NULL)
        current = current->next;
     // Set last_node next's pointer pointing to the new_tail
     current->next =new_tail;
     return head; 
   }
}