以下代码执行后，数组 arr 的内容是（ ）
int arr[6] = {1, 2, 3, 4, 5, 6};
for (int i = 0; i < 6; i += 2) {
arr[i] = arr[i] + arr[i+1];
arr[i+1] = arr[i] - arr[i+1];
arr[i] = arr[i] - arr[i+1];
}
- A. {2,1,4,3,6,5}
- B. {1,2,3,4,5,6}
- C. {3,1,4,2,5,3}
- D. {1,3,2,5,4,6}
正确答案：A