设计要求同过扬声器能完整演奏一首乐曲，演奏的重复次数可以控制，由键盘输入控制值。按“Q”键退出。文件里有详细的课程设计内容,附带经过老师检验合格的源代码.-Loudspeaker design requirements have been able to complete with a music concert, the concert can control the number of repeat, from keyboard input to control values. By　Q　to exit. Document in detail the content of the curriculum design, with qualified teachers through the source code.