# Why do we use pointer to pointer in linked list?

A linked list is a set of dynamically allocated nodes, arranged in such a way that each node contains one value and one pointer. The pointer always points to the next member of the list. If the pointer is NULL, then it is the last node in the list.

## Why do we use pointer to pointer in linked list?

A linked list is a set of dynamically allocated nodes, arranged in such a way that each node contains one value and one pointer. The pointer always points to the next member of the list. If the pointer is NULL, then it is the last node in the list.

## Which pointer is used in linked list?

Linked Lists as Arguments You should always keep one pointer variable pointing to the head of a linked list. This pointer variable is a way to name the linked list.

Why do we pass double pointers in linked list?

One of them is to indicate that you are passing an address and another is to make the changes available to the calling function (to achieve call by reference). Hope this helps. In the linked list if the head pointer has to point to some other node we need to use the double pointer when it is passing to a function.

### How do you set a pointer to a pointer?

Pointer assignment between two pointers makes them point to the same pointee. So the assignment y = x; makes y point to the same pointee as x . Pointer assignment does not touch the pointees. It just changes one pointer to have the same reference as another pointer.

### What is double pointer in linked list?

Double pointer may be used in linked list to pass as an argument whenever we need to make a change to the actual linked list passed through a function whose return type is void. Thus, such functions are used only to manipulate the linked list by passing the reference of its head. This is just same as pass by reference.

Where do we use double pointer?

Double pointers can also be used when we want to alter or change the value of the pointer. In general double pointers are used if we want to store or reserve the memory allocation or assignment even outside of a function call we can do it using double pointer by just passing these functions with ** arg.

## WHAT IS NULL pointer in linked list?

Null Pointer. • The final node in the linked list does not point to a next node. • If link does not point to a node, its value is set to NULL.

## What are double pointers used for?

A pointer is used to store the address of variables. So, when we define a pointer to pointer, the first pointer is used to store the address of the second pointer. Thus it is known as double pointers.

What is pointer example?

A pointer is a variable that stores the address of another variable. Unlike other variables that hold values of a certain type, pointer holds the address of a variable. For example, an integer variable holds (or you can say stores) an integer value, however an integer pointer holds the address of a integer variable.

### Which is the correct way to declare a pointer?

Explanation: int *ptr is the correct way to declare a pointer.