What is null in macro?

The C library Macro NULL is the value of a null pointer constant. It may be defined as ((void*)0), 0 or 0L depending on the compiler vendor.

What is null defined as in C?

NULL in c is defined as (void *)0, While for c++ its simple 0.

Is null a macro for 0?

NULL is a macro which is defined in C header files. The value of NULL macro is 0. NULL is used for pointers only as it is defined as (void *) 0. It should not be used other than pointers.

IS null == null in C?

NULL is a null pointer constant. As an exception (void*)0 is too, in C. When converted to a pointer type, it becomes a null pointer value. This is when it becomes a pointer pointing to some address not equal 0x0.

WHAT IS NULL macro give an example?

Null macro is defined in stdio.h and stddef.h.It is used to represent a null pointer in your code.its value is zero.Null pointer is same as an uninitialized pointer..It does not point anywhere.

What is the full meaning of NULL?

having no value
Null means having no value; in other words null is zero, like if you put so little sugar in your coffee that it’s practically null. Null also means invalid, or having no binding force. From the Latin nullus, meaning “not any,” poor, powerless null is not actually there at all.

What is NULL and void pointer?

A null pointer points has the value NULL which is typically 0, but in any case a memory location which is invalid to dereference. A void pointer points at data of type void. The word “void” is not an indication that the data referenced by the pointer is invalid or that the pointer has been nullified.

Is \0 and null the same?

The difference is that 0 is a numeric value where NULL is not. Data may not be able to have a null value. It may be interpreted strictly as an integer, and a non-integer value would be impossible. Commonly in memory, the address 0 is interpreted as null, which means it cannot be used.

What is Stddef in C?

h is a header file in the standard library of the C programming language that defines the macros NULL and offsetof as well as the types ptrdiff_t, wchar_t, and size_t.

Why do we use null in C?

Some uses of the null pointer are: a) To initialize a pointer variable when that pointer variable isn’t assigned any valid memory address yet. b) To pass a null pointer to a function argument when we don’t want to pass any valid memory address.

What header is null in C?

STDDEF.H
NULL is defined in the following header files: CRTDBG. H, LOCALE. H, STDDEF. H, STDIO.