说明：  这是我写的一个小程序，在此程序中直接用m=21时程序运行正常，当改为m=total_row时运行不正常了，输入数据全变为了0，请各位指点是一下是何原因，并帮我改正一下发到我的邮箱wyf19770314@163.com中，谢谢！
(This is what I wrote a small procedure, in this process the direct use of m = 21 procedural operating normally, when changed to m = total_row when abnormal operation, the input data had all become a 0, please point it is about what the reasons for and help me to correct you sent to my mailbox in wyf19770314@163.com Thank you!)