Question: What Is The Advantage Of Declaring Void Pointer?

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..

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.

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.

Which of the following is generic pointer?

A void pointer is a special pointer that can point to object of any type. A void pointer is typeless pointer also known as generic pointer.

What can’t you do on a void pointer?

Explanation: Because the void pointer is used to cast the variables only, So pointer arithmetic can’t be done in a void pointer.

What is size of void pointer?

8 bytesThe size of a double pointer is 8 bytes! The size of a void pointer is 8 bytes!

WHAT IS NULL pointer 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.

Why would you have a pointer point to another pointer?

We already know that a pointer points to a location in memory and thus used to store the address of variables. So, when we define a pointer to pointer. The first pointer is used to store the address of the variable. And the second pointer is used to store the address of the first pointer.

What does void * mean?

a void* is a pointer, but the type of what it points to is unspecified. When you pass a void pointer to a function you will need to know what its type was in order to cast it back to that correct type later in the function to use it.

Are void pointers bad?

The void pointer are only a bad practice in C++ and not C. They are necessary in C for any generic programming. One of the best example is POSIX threads they take in a void pointer and they return a void pointer.

What happens when a pointer is declared?

If you see the * in a declaration statement, with a type in front of the *, a pointer is being declared for the first time. AFTER that, when you see the * on the pointer name, you are dereferencing the pointer to get to the target.

What is a void pointer?

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.

What is a void 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.

What is the correct way to declare a pointer?

Pointers must be declared before they can be used, just like a normal variable. The syntax of declaring a pointer is to place a * in front of the name. A pointer is associated with a type (such as int and double ) too.

When would you use a void pointer?

void pointers should be used any time the contents of a block of data is not important. For example when copying data the contents of a memory area is copied but the format of the data is not important.

Can a pointer point to itself?

Yes, a pointer can contain the position of a pointer to itself; even a long can contain the position of a pointer to itself.

What is generic pointer?

The void pointer, also known as the generic pointer, is a special type of pointer that can be pointed at objects of any data type! A void pointer is declared like a normal pointer, using the void keyword as the pointer’s type: 1. void *ptr; // ptr is a void pointer.