A const pointer always points to the same address, and this address can not be changed. A pointer to a non-const value can change the value it is pointing to. ... A pointer to a const value treats the value as const (even if it is not), and thus can not change the value it is pointing to.

What is the point of const pointers?

Constant pointers:

In constant pointers, the pointer points to a fixed memory location, and the value at that location can be changed because it is a variable, but the pointer will always point to the same location because it is made constant here.

How do you declare a const pointer?

A pointer to a constant is declared as : const int *ptr (the location of 'const' makes the pointer 'ptr' as a pointer to constant.