js不用reverse反转数组代码_反转数组而不使用Array.Reverse（）
How to reverse an array (in C#) without using Array.Reverse() method?
For example,
int[] arr = {1,3,4,9,8};
// some code here
Console.WriteLine(string.Join(",", arr));
should result in
8,9,4,3,1
I got this as an interview task.
解决方案
The code to be substituted in place of // some code here in the question is:
for (int i = 0; i < arr.Length / 2; i++)
{
int tmp = arr[i];
arr[i] = arr[arr.Length - i - 1];
arr[arr.Length - i - 1] = tmp;
}
You should iterate only through the first half of the array (arr.Length / 2). If you iterate through the whole array (arr.Length), it will be reversed twice, yielding the same element order as before it started.