The has been an error I wrote

CodePudding user response:

A does not define, nor initialise 0
All string type definition is wrong, should be defined as a char STR/MAX, MAX=20

CodePudding user response:

I hope it can help you: https://blog.csdn.net/it_xiangqiang/category_10581430.html
I hope it can help you: https://blog.csdn.net/it_xiangqiang/category_10768339.html