C++ Pointers & Functions Question:
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Explain what is NULL pointer and void pointer and what is their use?


A NULL pointer has a fixed reserved value that is not zero or space, which indicates that no object is referred. NULL pointers are used in C and C++ as compile-time constant. NULL pointer represents certain conditions, like successor to the last element in linked list, while a consistent structure of the list of nodes are maintained.

A void pointer is a special pointer that points to an unspecified object. A null pointer can not be dereferenced. The address manipulation can directly be done by pointer casting to and from an integral type of sufficient size.

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