#include <stdio.h>

int main(void) {

  int i;
  double a[5] = {5.0, 7.0, 9.0, 3.0, 1.0};
  double *pa = &a[0]; 

  pa[0]        = 12.0;
  *(pa + 1)    = 13.0;
  *(a + 2)     = 14.0;
  *(&a[0] + 3) = 15.0;

  printf("pa[0] = %f\n",         pa[0]);
  printf("*(pa + 1) = %f\n",     *(pa + 1));
  printf("*(a + 2) = %f\n",      *(a + 2));
  printf("*(&a[0] + 3) = %f\n",  *(&a[0] + 3));

  return 0;
}