Introduction - If you have any usage issues, please Google them yourself
The function of each module: readtxt (), document readers read writetxt (), document readers to write addreader (reader s), add readers delreader (int number), delete readers searchreader (int number), to find readers readerdata (), the reader data management readbtxt (), read the book documents writebtxt (), write the book documents addbook (libook s), add books delbook (int number), delete the book searchbook (int number), to find books bookdata (), data management books borbook (), readers library retbook (), readers book main () main function