问题的提出：金卡在现代生活里应用广泛，无论排长队于ATM机前取款还是就餐、购物、就医等等。在国外电子货币十分流行，其实电子货币是系统工程，它涉及金融、安全、通信、计算机等领域。这里为使读者掌握动态数据的用法，仅模拟其存款于取款过程。-The question raised: Gold in the modern life are widely used, regardless of long lines at teller or ATM machine before dining, shopping, medical care and so on. Electronic money in foreign countries is very popular, in fact, e-money are systems engineering, which involves financial, security, communications, computing and other fields. Here to enable the reader to master the usage of dynamic data, only simulated the process of their deposits in cash.