说明：  编写程序，程序运行时使PC机成为一架可弹奏的“钢琴”。当按下数字键1~8，依次发出1，2，3，4，5，6，7，I八个音调。按CTRL+C则退出“钢琴”状态。
(Write a program, the program is running to make PC-1 may play into the " piano." When pressing the number keys 1 to 8, followed by issue of 1,2,3,4,5,6,7, I eight tones. Press CTRL+ C has withdrawn from the " Piano" state.)