股票交易系统，1）可以注册用户名、密码和注册资金； 2）注册后的股民可以购买股票； 3）股票的信息包括股票代码、股票名称、总股数、可交易的股数。-Stock trading system) can register a user name, password, and registered capital 2) the registration of the investors can buy shares 3) stock information includes stock co