元素逆序输出

第一种for循环

int arr[] = { 1,2,3,4,5 ,6};
    int start = 0;
    int end = sizeof(arr) / sizeof(int) - 1;
    int temp = 0;
    for (int i = 0; i <= end/2; i++)
    {
      temp = arr[start + i];
      arr[start + i] = arr[end - i];
      arr[end - i] = temp;
    }

第二种while循环

 int arr[6] = { 1,2,3,4,5,6};
    int start = 0;
    int end = sizeof(arr) / sizeof(int) - 1;
    int temp = 0;
    while (start < end)
    {
      temp = arr[start];
      arr[start] = arr[end];
      arr[end] = temp;
      start++; end--;
    }