随机生成4位数，你要在有限的步数内猜出。 用法：输入4位数字后按’ok’键，可看到当前结果。 按answer键查看正确答案 按reset键重新开始-Randomly generated 4-digit, you have to guess within a finite number of steps. Usage: Enter the 4 digit number and click ' ok' button, you can see the current r