// Abhishek Prasad
// COSC 1410
// Haberdar Tu-Th 8:30-10:00
// March 13, 2016



#include <iostream>
using namespace std;



    int main()
{
    int unInput;    // declaring variables for Input for Password and Username
    int pwInput;
    int UN = 123456; // Username
    int PW = 1234;  // temporary password

    for (int tries = 1; tries < 4; tries ++)
        {

        cout << "Enter Username: ";
        cin >> unInput;

        cout << "Enter Password ";
        cin >> pwInput;

        if (unInput == UN && pwInput == PW)     // if statement - checks if pw and un are correct. if true, the
        {
            cout << "Congratulations! Now please enter your new password" << endl;

            bool match = false;

            do
            {
                cout << "The new password must be a 4 digit number and different from the temporary password. Enter new password:" << endl;

                cin >> pwInput;

                if (pwInput > 999 && pwInput < 10000 && pwInput != PW)
                    {

                    PW = pwInput;
                    cout << "You have changed your PW successfully! Please re-login."<<endl;
                    match = true;
                    }
            } while (match != true);
            break;  // breaks program
        }
        else    // if the program failed 3 times
        {
            cout << "Invalid credentials, program terminates after 3 falied attemps, number of failed tries= " << tries << endl;
        }
        if (tries == 3) // if tries are 3 it will run the following statement
        {
            cout << "The system cannot be accessed. The program has ended.";
        }
    }
    for (int tries = 1; tries < 4; tries ++) // these statements run after the statement
    {
        cout << "Enter Username: ";
        cin >> unInput;

        cout<< "Enter Username: ";
        cin >> pwInput;

        if (unInput == UN && pwInput == PW)
        {
            cout << "Access granted! Enjoy :)";
            break;
        }
        else
        {
            cout << "Wrong password. Number of tries left: " << tries << endl;
        }

        if (tries == 3)

        {
            cout << "The system cannot be accessed. The program has ended."<<endl;
        }
    }
    return 0;
}

// end of program :)