function game
clc
% Ask for command.
display('To create profile: "new". To reset: "rst". To quit: "quit".')
user=input('Username (or command): ', 's');
% If they didn't quit...
if strcmpi(user,'quit')==false
    A=0;
    % Reset:
    if strcmpi(user,'rst')==true
        gamestr=struct();
        gamestr.best=999999999999999;
        save('game.mat', 'gamestr');
        A=1;
    end
    load('game.mat');
    % New user
    if strcmpi(user,'new')==true
        user=input('New username: ', 's');
        pass=input('New password: ', 's');
        gamestr.(user).games=0;
        gamestr.(user).guesses=0;
        gamestr.(user).best=999999;
        gamestr.(user).password=pass;
        A=1;
        save('game.mat', 'gamestr');
    end
    % Login system
    if A==0
        if isfield(gamestr, user)==false
            display('Error.')
        else
            pass=input('Password: ', 's');
            % Pass is good, then game.
            if pass==gamestr.(user).password
                display('Your goal is to guess a number 1-1000.')
                answer=round(1000*rand(1,1));
                guesses=0;
                guess=0;
                while guess~=answer
                    guess=input('Your guess: ');
                    guesses=guesses+1;
                    if guess>answer
                        display('Your guess is too high.')
                    elseif guess<answer
                        display('Your guess is too low.')
                    end
                end
                display('Congradulations.')
                display('You took this many guesses:')
                display(guesses)
                % Save results to structure
                gamestr.(user).games=gamestr.(user).games+1;
                gamestr.(user).guesses=gamestr.(user).guesses+guesses;
                display('Your average guesses per game is: ')
                display(gamestr.(user).guesses./gamestr.(user).games)
                % Check for high scores.
                if guesses < gamestr.(user).best
                    display('NEW PERSONAL HIGH SCORE!')
                    gamestr.(user).best=guesses;
                end
                if guesses < gamestr.best
                    display('NEW GLOBAL HIGH SCORE!')
                    gamestr.best=guesses;
                end
                % Save all data
                save('game.mat', 'gamestr');
            end
        end
    end
end
end