Application description Purpose=======This application helps people playing guess number game.Introduction============Guess number is usually a game playing between 2 players. At beginning of the game, each player keeps one 4-digit secret number in mind. The number is formed with digits which range from 0 to 9, and each digit cannot be repeated.During the game, one player proposes a number for guess attempt, the other player replies the result compared between the guess and the secret number. The result is composed of how many digits has the player guessed on the same position (noted as 'A') and how many digits has the player guessed on different position (noted as 'B'). For example, when the secret number is 1234 and the guess is 1357, the result will be 1A1B. (1 is at the same position, 3 is at different position.)How to use==========Please see the 'Introduction' in Action bar or menu.