Backspace in array input C++

Question

Following is the code for a login program that inputs the username, and then the password, while echoing '*' for every character entered, and then compares the username and password to preset values to see if they match and exits the program if it is true, else it goes back to the beginning.

int main()
{
    int i = 0; string u; char parr[i + 1], ch;
    while (1)
    {
        system("cls");
        cout << "Enter username." << endl;
        cin >> u;
        system("cls");
        cout << "Enter password." << endl;
        i = 0;
        while (1)
        {
        tag:ch = getch();
            if (ch == '\r')
            {
                break;
            }
            if (ch == '\b')
            {
                cout << '\b';
                --i;
                ch = '\0';
                parr[i] = '\0';
                cout << ' ' << '\b';
                goto tag;
            }
            parr[i] = ch;
            ch = '*';
            cout << ch;
            ++i;
        }

        parr[i] = '\0';
        string p = "password";

        if (u == "username" && parr == p)
        {
            system("cls");
            cout << "Welcome!";
            break;
        }

        else
        {
            system("cls");
            cout << "Username and password entered does not match! Please try again.";
        }
        getch();
    }
    getch();
}       

Now, here's the problem: Recently, I found out that this method of input (for the password) doesn't work as intended with Backspace, Delete, or the arrow keys. All of these keys input certain symbols instead of deleting characters or moving the cursor. So I tried out a workaround (currently only) for the backspace key. All worked fine- the previous character was deleted when I pressed backspace, but in the end, after the comparison with the preset values, it showed that the password doesn't match.

If you could please help me in the following:

*Working backspace functionality (and delete and arrow keys if possible)
*Pressing Esc at ANY point of the program quits it.
*I have used goto in this program, whose atrocities we all already know of. Please suggest me a way to avoid this, and also to make all this code neater than its current messy state.

Answer 1

Use continue instead of goto. In your case this will do the same: jump to the start of the loop.
Then run a debugger and watch what happens with your array if you input backspaces.