简单的键盘扫描程序 这是以前编的 希望对大家有点帮助-Simple keyboard scanner that was previously compiled hope to be helpful

利用反转法扫描键盘，程序简单，理解稍有难度，方便51学习者的学习。-Inversion method by scanning the keyboard, the program is simple, a little difficult to understand, easy 51 learners.