On the analysis of pointer and array written test

Pointer and array written test questions
  actually have nothing to say in this part. No matter how much you talk about, it is better to pull out the code and run it yourself. There are actually so many questions that can be tested.

int main()
{
	//int a[] = { 1, 2, 3, 4 };
	//printf("%d\n", sizeof(a)); //16
	//printf("%d\n", sizeof(a + 0)); //4
	//printf("%d\n", sizeof(*a)); //4
	//printf("%d\n", sizeof(a + 1)); //4
	//printf("%d\n", sizeof(a[1]));//4
	//printf("%d\n", sizeof(&a));//4
	//printf("%d\n", sizeof(*&a)); //16
	//printf("%d\n", sizeof(&a + 1)); //4
	//printf("%d\n", sizeof(&a[0])); //4
	//printf("%d\n", sizeof(&a[0] + 1));//4 

	char arr[] = { 'a', 'b', 'c', 'd', 'e', 'f' };
	char arr[] = "abcdef";
	//printf("%d\n", sizeof(arr));//6
	//printf("%d\n", sizeof(arr + 0));//4
	//printf("%d\n", sizeof(*arr));//1
	//printf("%d\n", sizeof(arr[1]));//1
	//printf("%d\n", sizeof(&arr));//4
	//printf("%d\n", sizeof(&arr + 1));//4
	//printf("%d\n", sizeof(&arr[0] + 1));//4

	//printf("%d\n", strlen(arr));//19
	//printf("%d\n", strlen(arr + 0));//19
	//printf("%d\n", strlen(*arr));
	//printf("%d\n", strlen(arr[1]));
	//printf("%d\n", strlen(&arr));
	//printf("%d\n", strlen(&arr + 1));
	//printf("%d\n", strlen(&arr[0] + 1));

	//char *p = "abcdef";
	//printf("%d\n", sizeof(p));//4
	//printf("%d\n", sizeof(p + 1));//4
	//printf("%d\n", sizeof(*p));//1
	//printf("%d\n", sizeof(p[0]));//1
	//printf("%d\n", sizeof(&p));//4
	//printf("%d\n", sizeof(&p + 1));//4
	//printf("%d\n", sizeof(&p[0] + 1));//4

	//二维数组
	//int a[3][4] = { 0 };
	//printf("%d\n", sizeof(a));//48
	//printf("%d\n", sizeof(a[0][0]));//4
	//printf("%d\n", sizeof(a[0]));//16
	//printf("%d\n", sizeof(a[0] + 1));//4
	//printf("%d\n", sizeof(*(a[0] + 1)));//4
	//printf("%d\n", sizeof(a + 1));//4
	//printf("%d\n", sizeof(*(a + 1)));//16
	//printf("%d\n", sizeof(&a[0] + 1));//4
	//printf("%d\n", sizeof(*(&a[0] + 1)));//16
	//printf("%d\n", sizeof(*a));//16
	//printf("%d\n", sizeof(a[3]));//16

	return 0;
}