逆序一个数组

int arr[] = {2,34,4,55,43,6,7,8,100};
	
	for (int i = 0; i < sizeof(arr) / sizeof(arr[0]) / 2; ++i)
	{
		int temp = arr[i];
		arr[i] = arr[sizeof(arr)/sizeof(arr[0]) - 1 - i];
		arr[sizeof(arr) / sizeof(arr[0]) - 1 - i] = temp;
	}


	for (int i = 0; i < sizeof(arr) / sizeof(arr[0]); ++i)
	{
		printf("arr[%d] = %d\n", i, arr[i]);
	}