使用说明：

某种情况下，我们需要将一个数的高低位互换，也就是说将一个数的第0位与第七位互换，第1位与第六位互换。以此类推。一时想不出，这里有两种算法。

有仿真文件。将一个数给a。转换成b。赋给P2口，显示出来，可以看到。数的高低位换过来了。-Usage: under certain circumstances, we need a number of exchange of high and low places, that is to say a few of the first and seventh 0 exchange, the first and the sixth in a swap. And so on. Moment can not think of, there are two algorithms. There are simulation file. A few to a. Converted to b. Assigned to P2 mouth, show up, it can be seen. The number of high and low bit-for-back.