What Is A Void Pointer In C?

What is void pointer in C with example?

A void pointer is nothing but a pointer variable declared using the reserved word in C ‘void’.

When a pointer variable is declared using keyword void – it becomes a general purpose pointer variable.

Address of any variable of any data type (char, int, float etc.) can be assigned to a void pointer variable..

What is a pointer to void?

A void pointer is a pointer that can point to any type of object, but does not know what type of object it points to. A void pointer must be explicitly cast into another type of pointer to perform indirection. A null pointer is a pointer that does not point to an address. A void pointer can be a null pointer.

Where is void pointer used?

The void pointer in C is a pointer which is not associated with any data types. It points to some data location in the storage means points to the address of variables. It is also called general purpose pointer. In C, malloc() and calloc() functions return void * or generic pointers.

What is null and void pointer?

Null pointer is a special reserved value of a pointer. … Void pointer is a specific pointer type – void * – a pointer that points to some data location in storage, which doesn’t have any specific type. So, once again, null pointer is a value, while void pointer is a type.

Why do we typecast malloc?

Advantages to casting: The cast allows for pre-1989 versions of malloc that originally returned a char * . Casting can help the developer identify inconsistencies in type sizing should the destination pointer type change, particularly if the pointer is declared far from the malloc() call.

How do I print a void pointer?

The pointer value itself is rarely interesting, but you can print it with printf(“%p\n”, out); . The %p formatting specifier is for void * . printf(“%p\n”, out); is the correct way to print a (void*) pointer.

What is a void pointer and how do we use it?

Void pointer is a generic pointer that can be used to point another variable of any data type. Void pointer can store the address of variable belonging to any of the data type. So, void pointer is also called as general purpose pointer.

How do you assign a void pointer?

Now, we want to assign the void pointer to integer pointer, in order to do this, we need to apply the cast operator, i.e., (int *) to the void pointer variable. This cast operator tells the compiler which type of value void pointer is holding.

Can a structure contain pointer to itself?

You cannot declare a structure type that contains itself as a member, but you can declare a structure type that contains a pointer to itself as a member. A structure variable definition contains an optional storage class keyword, the struct keyword, a structure tag, a declarator, and an optional identifier.

How do I printf a pointer?

You can print a pointer value using printf with the %p format specifier. To do so, you should convert the pointer to type void * first using a cast (see below for void * pointers), although on machines that don’t have different representations for different pointer types, this may not be necessary.

What is size of void pointer?

The size of void pointer varies system to system. If the system is 16-bit, size of void pointer is 2 bytes. If the system is 32-bit, size of void pointer is 4 bytes. If the system is 64-bit, size of void pointer is 8 bytes.

Why void is used in C?

void (C++) When used as a function return type, the void keyword specifies that the function does not return a value. When used for a function’s parameter list, void specifies that the function takes no parameters. When used in the declaration of a pointer, void specifies that the pointer is “universal.”