Use C/C++ to simulate a file directory system to support following commands:

login: user login dir: output all subdirectories and files under current directory mkdir:

create a new directory cd: change directory create:

create a new file delete: delete a file read: read a file write: write a file

2) implements read/write protection.

Your program should allow the user to type the above commands in a terminal after login, and you may also let the user directly input file content in the terminal.