#include <stdio.h>

int main(void) {

  int    *i,    j = 1;
  char   *c,    h = 'a';
  double *d,    e = 2.0;
  void   *f;

  i = &e;  /* error: i cannot point to e */
  c = &h;
  d = &j;  /* error: d cannot point to j */
  f = &j;  /* OK. Generic pointer */

  printf("%d, %c, %f, %d\n", *i, *c, *d, *(int *)f);
}