C size of void pointer

What is the size of Void Pointer variable in C ?

Pointer  : 
Pointer is the variable that stores the address of another variable .
How to calculate size of Pointer ? 
  1. Size of Void Pointer can be evaluated by using sizeof operator
  2. Pointer stores the address of the Variable .
  3. Address of variable is nothing but the integer value .
  4. In C , for storing integer value 2 bytes are required .
  5. So void  Pointer variable requires 2 bytes of memory. 

int main(void)
{
  int num = 0;

  void *ptr;

  num = 15;

  ptr = #

  /* Output the size   */

 printf("Size of Pointer : %d Bytes",sizeof(pointer));

  return 0;
}

Output :
 Size of Pointer : 2 Bytes
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