4*4矩阵键盘扫描 请不要重复上传同一源码，-4* 4 matrix keyboard scanning Do not duplicate upload the same source, in order to open the account owners after passing the examination. If you do not want to upload the source code, you can become a VIP member] access to the

程序是加减法的进位程序，是我帮同学做的课程设计，基本上把进位可能都考虑进去了-The program is to add and subtract binary program, I help students to do curriculum design, basically carry may have taken into account the