Break 4 Digit Code

Features Break 4 Digit Code

A simple but fun mind exercise.
Your phone holds a 4-digit number in her mind and you are trying to guess it.After each guess, she ("your phone") gives you some hint.For example, if she holds 1234 and you make a prediction like 4567, then since only one digit is true "4" but it is not in correct place, it gives you a hint such as "-1".
If your guess is 2764, then since two digit values: 2 and 4 are right but only 4 is in its correct position, then the hint is like "-1 +1".
Thus, -n shows that you predicted n digits correct but they are in wrong placesand +n plus shows that you predict n digits correct and they are also in right position.Have fun!