题目----逆序

void reverse(int arr[], int sz)

{

	int left = 0;

	int right = sz - 1;

  while (left < right)

	{

		int t = arr[left];//创建临时变量用来实现调换

		arr[left] = arr[right];

		arr[right] = t;

		left++;

		right--;

	}

}