CSE 461 Lab 1 solved

Description

File I/O

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<string> user; // the list of usernames
    vector<string> 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
   }
   

If you want to add encryption to your program check out the following : this program.