keil中,这段语句怎么更简洁的表达switch(music_num){case 0:M(song1[i][0],song1[i][1],music_pause|music_stop);IO_vWritePort(P5,0x07); if(music_stop) i=0;else if(music_pause);else if(song1[i][0]==ED) i=0;else {i++;IO_vWritePort(P5,0x06);}brea
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