#include <stdio.h>

int main(int argc, const char * argv[])
{

  // 1 可改變指針
  const int a = 10;
  int *p = &a;
  *p = 1000;
  printf("*p = %d\n", *p);

  // 2 可改變指針
  const b = 10;
  int *pb = &b;
  pb = p;
  printf("*pb = %d\n", *pb);

  // 3
  const c = 10;
  int * const pc = &c;
  *pc = 1000;
  //pc = pb;不能改變

  //4
  const d = 10;
  const * int const pd = &d;
  //*pd = 1000; 不能改變


  printf("\n");
  return 0;
}