void pointer in C Language

Categories: C language

Till now, we have studied that the address assigned to a pointer should be of the same type as specified in the pointer declaration. For example, if we declare the int pointer, then this int pointer cannot point to the float variable or some other type of variable, i.e., it can point to only int type variable. To overcome this problem, we use a pointer to void. A pointer to void means a generic pointer that can point to any data type. We can assign the address of any data type to the void pointer, and a void pointer can be assigned to any type of the pointer without performing any explicit typecasting.


Syntax of void pointer

void *pointer name;  


Declaration of the void pointer is given below:

void *ptr;  

In the above declaration, the void is the type of the pointer, and 'ptr' is the name of the pointer.


Let us consider some examples:

int i=9;         // integer variable initialization.

int *p;         // integer pointer declaration.

float *fp;         // floating pointer declaration.

void *ptr;         // void pointer declaration.

p=fp;         // incorrect.

fp=&i;         // incorrect

ptr=p;         // correct

ptr=fp;         // correct

ptr=&i;         // correct


Size of the void pointer in C

The size of the void pointer in C is the same as the size of the pointer of character type. According to C perception, the representation of a pointer to void is the same as the pointer of character type. The size of the pointer will vary depending on the platform that you are using.

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