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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 castExample
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
", 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
Updated on: 17-Mar-2021
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