What is void pointer in C language?

It is a pointer that can hold the address of any datatype variable (or) can point to any datatype variable.

Declaration

The declaration for void pointer is as follows −

void *pointername;

For example − void *vp;

Accessing − Type cast operator is used for accessing the value of a variable through its pointer.

Syntax

The syntax for void pointer is given below −

* ( (type cast) void pointer)

Example 1

int i=10;
void *vp;
vp = &i;
printf ("%d", * ((int*) vp));
// int * type cast

Example

Following is the C program for void pointer −

#include<stdio.h>
main ( ){
   int i =10;
   float f = 5.34;
   void *vp;
   vp = &i;
   printf ("i = %d", * ((int*)vp));
   vp = &f;
   printf ( "f = %f", * ((float*) vp));
}

Output

When the above program is executed, it produces the following result −

i = 10
f = 5.34

Example 2

Given below is the C program for pointer arithmetic in void pointers −

#include<stdio.h>
#define MAX 20
int main(){
   int array[5] = {12, 19, 25, 34, 46}, i;
   void *vp = array;
   for(i = 0; i < 5; i++){
      printf("array[%d] = %d\n", i, *( (int *)vp + i ) );
   }
   return 0;
}

Output

When the above program is executed, it produces the following result −

array[0] = 12
array[1] = 19
array[2] = 25
array[3] = 34
array[4] = 46