//總結：指標的所有算術運算都需要調整，調整的權重為sizeof （指標去掉一個 * ）

/*【指標+數字】√
【指標-數字】√
指標+1：加一個單元格

#include <stdio.h>
int main()
{
 int*p = (int*)2000;
 printf("%d\n",p+4);//2016
 printf("%d\n",(short*)p+4);//2008
 printf("%d\n",(double*)p+4);//2032
 printf("%d\n",(float**)p+4);//2016
 printf("%d\n",(unsigned short*)p+4);//2008
 printf("%d\n",(long*)p+4);//2016
 printf("%d\n",(char*)p+4);//2004
 printf("%d\n",(unsigned long long)p+4);//2004 //注意此括號中無*
 return 0;
}

#include <stdio.h>
int main()
{
 int*p = (int*)0x2010;
 printf("%x\n",p-2);//2008
 printf("%x\n",(short*)p-2);//200c
 printf("%x\n",(unsigned long*)p-2);//2008
 printf("%x\n",(long long**)p-2);//2008
 printf("%x\n",(float*)p-2);//2008
 printf("%x\n",(double*)p-2);//2000
 printf("%x\n",(char*)p-2);//200e
 printf("%x\n",(unsigned long)p-2);//200e //注意此括號中無*
 return 0;
}
*/

/*
【指標+指標】×
【指標-指標】√
//指標-指標：間隔的單元個數，不是位元組數
//做法：1、算出位元組數 2、除以調整的權重

#include <stdio.h>
int main()
{
 int arr[10] = {1};
 int *p = &arr[1];//x+4
 int *q = &arr[9];//x+36
 printf("%d\n",p - q);//[-（32/4）= -8]
 printf("%d\n",q - p);//8
 printf("%d\n",(short *)q - (short *)p);//16
 printf("%d\n",(double *)q - (double *)p);//4
 printf("%d\n",(int ***)q - (int ***)p);//8
 printf("%d\n",(char **)q - (char **)p);//8
 printf("%d\n",(long)q - (long)p);//32 //注意此括號中無*
 return 0;
}
*/