单片机抢答器一个是修改了原来在抢答过程中还可以调整倒计时时间的BUG..一个是修改了错误的利用编译器的循环来实现自身程序的循环的错误 -Responder a microcontroller to modify the original in the answer in the process also can adjust the countdown time BUG .. the wrong one is used to modify the compiler to implement