Description
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.
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.
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
}
If you want to add encryption to your program check out the following : this program.
CSE 461
