这个程序是4路抢答器的程序，这个程序实现的功能是：当主持人按下抢答键后，参赛选手才可以进行抢答。抢答时能发出声响，并通过七段数码管显示是哪位选手抢答的。这个程序在PIC单片机上测试过，效果良好-This program is 4-way Responder program, this program is to achieve the function: When the host pressed to answer in key, players can only answer in. Res