Not able to understand why this is not giving correct ouput

#1

void insertAtTail(node*&head, int d){
if(head == NULL){
head = new node(d);
return;
}

node * new_node = new node(d);
node* tail = head;
while(tail->next == NULL){
    tail = tail->next;
}
tail->next = new_node;

}

#2

@Nitishkumar9711 please send the full code using cb ide
but considering this code you havent updated tail at last
do tail = new_node in last

#3

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