模拟DOS下FAT表的构造，实现将文件的逻辑结构转换成存储结构，设计便于顺序存取和直接存取的文件存储结构。-simulated DOS FAT table structure to achieve the logical file structure converted into storage structure, Design order to facilitate access and direct access to the file storage structure.

模拟ATM的一般功能！创建账户，存钱，取现金等，查询余额，修改密码等功能！-The general function of simulated ATM! To create accounts, save money, take cash, check balances, change your password and other functions!