NULL in C

The C NUL is a single character that compares equal to 0. The C NULL is a special reserved pointer value that does not point to any valid data object.

1. How null is defined in C?
2. Is '\ 0 and null the same?
3. Is null in C just 0?
4. What is the purpose of null in C?

How null is defined in C?

In computer programming, null is both a value and a pointer. Null is a built-in constant that has a value of zero. It is the same as the character 0 used to terminate strings in C. Null can also be the value of a pointer, which is the same as zero unless the CPU supports a special bit pattern for a null pointer.

Is '\ 0 and null the same?

'\0' is defined to be a null character. It is a character with all bits set to zero. This has nothing to do with pointers. '\0' is (like all character literals) an integer constant with the value zero.

Is null in C just 0?

NULL is 0 . NULL should be used with pointers, not integers. There is no way that int x can be NULL, it is a value type.

What is the purpose of null in C?

A null pointer is a pointer which points nothing. 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.