#include <stdio.h>
int main(void)  {
  double d = 13.5; 
  double *p;   /* p is a pointer to a double  */
  
  p = &d; /* p = address of d */

  printf("Value of  d = %.2f\n", d);
  printf("Value of &d = %d\n", &d);
  printf("Value of  p = %d\n", p);
  printf("Value of *p = %.2f\n", *p);
  printf("Value of &p = %d\n", &p);
  *p = -5.3;        /* d = -5.3 */
  printf("Value of  d = %.2f\n", d);
  return 0;
}