(Please use c++ code)

1. Create a class PasswordFile which has the following interface :

class PasswordFile { public: PasswordFile(string filename);// opens the file and reads the names/passwords in the vector entry vector getFile(); // returns the vector entry void addpw(UserPw newentry); //this adds a new user/password to entry and writes entry to the file filename bool checkpw(string user, string passwd); // returns true is user exists and password matches private: string filename; // the file that contains password information vector entry; // the list of usernames/passwords };