C Programming - Pointers - Discussion

What is meant by pointer?

Void is no return type. If I write (void*) something then print the void value=null.

'Null Pointer' means which reference nothing (means it doesn't point any address) and void pointer mean we can store any type of value's address (like address of the variable int, char, float, etc.).

In C, NULL is a macro.
It is defined as #define NULL 0.
So the above question can be seen as;
void *p;
p=(void *)0;
And the question is what is p?

The answer it is a null pointer

NULL is used to indicate the pointer that doesn't point to a valid location. Ideally, we should initialize pointers as NULL if we don't know their value at the time of declaration. Also, we should make a pointer NULL when memory pointed by it is deallocated in the middle of a program.

Void pointer:it is a generic pointer that can point to any data type. We can assign any data type to void pointer and a void pointer can be assigned to a pointer of any data type.

What is the scope of NULL pointer?

What is the scope of NULL pointer?

A null pointer is one which is not pointing to anything, i.e. it is assigned a null value. If there is no address to assign to a pointer, it is considered a good practice to set it to null.

Syntax: <data type> *<variable name> = NULL;
Example: int *ptr = NULL;
char *ptr = '\0';

A void pointer is one which does not have any data type associated with it, i.e. it can be assigned a value of any type. Also known as the general purpose pointer.
Example: void *ptr;
int a; char c;
ptr = &a; //ptr changes to integer pointer as address of integer is assigned to it
ptr = &c; //ptr changes to character pointer as address of character is assigned to it.

I think parenthesis id preferred first wrt * so the answer will be C.

0 may present valid address in memory.

I agree @Arpan.