[問題] 有關指標的轉型和偏移
已爬文但關鍵字不知道該怎下，所以想請問一下版大
程式碼
int main (void)
{
int arr[3] = {1, 2, 3};
int* ptr =(int*)(&arr+1);
printf ("%d \n", *(ptr-1));
return 0;
}
上面程式我執行完的結果是 3
但我自己解讀的結果是 1
我的想法是指標ptr 指向陣列arr的位置+1，所以是arr[1]
在printf的時候又將 ptr-1，所以又指回arr[0]位置，
因此結果為 1
想問一下我的觀念那邊有問題，還有(int *)跟(&arr+1)的觀念和作用
感謝~~~
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