/*------------------------------------------------------------------*/
/* voidpointers.c  (Demonstrate void pointers)                      */
/*------------------------------------------------------------------*/

#include <stdio.h>

int main(int argc, char *argv[])
{
   int i = 5;
   double d = 5.5;
   int *pi;
   double* pd;
   void *pv;

   pi = &i;              /* OK */
   printf("%d\n", *pi);  /* OK */

   pd = &d;              /* OK */
   printf("%f\n", *pd);  /* OK */

   pi = &d;  /* Error:  Assignment from incompatible pointer type */
   pd = &i;  /* Error:  Assignment from incompatible pointer type */

   pv = &i;                       /* OK */
   printf("%d\n", *pv);           /* Error:  Invalid use of void expression. */
   printf("%d\n", *(int*)pv);     /* OK */

   pv = &d;                       /* OK */
   printf("%f\n", *pv);           /* Error:  Invalid use of void expression. */
   printf("%f\n", *(double*)pv);  /* OK */

   return 0;
}