In this laboratory, we are going to maintain a username-password system by storing the usernames and passwords in a file. The file will consist of a single username and password per line with a space in between.
1. Begin by creating a class PasswordFile which has the following interface:
class PasswordFile
public:
PasswordFile(string filename); // opens the file and reads the names/passwords in the vectors user and password.
void addpw(string newuser, string newpassword); //this adds a new user/password to the vectors and writes the vectors to the file filename bool checkpw(string user, string passwd); // returns true if user exists and password matches
private:
string filename; // the file that contains password information
vector user; // the list of usernames
vector password; // the list of passwords
void synch(); writes the user/password vectors to the password file
The constructor accepts a filename, and reads the file one-line at a time and adds values to the vectors user and password. The function addpw adds a user/password pair to end of each vector.
2. Now create a password.txt file with some entries such as:
jsmith turtle
madams apple
Also create a main program to test your classes :
int main() PasswordFile passfile
("password.txt");
passfile.addpw("dbotting","123qwe");
passfile.addpw("egomez", "qwerty");
passfile.addpw("tongyu", "liberty");
// write some lines to see if passwords match users