When you have a width specification of 1 (like you do in the second line) the output will be H or T. If you have anything else, the output will be HEADS or TAILS. But first, we need to add the %H ...

因为有一部分用的是第三发的库，里面有printf输出异常信息，需要把这些内容写入日志，同时还要在屏幕上显示，该怎么实现？