利用VC++6.0对数据库的动态刷新和多表切换-VC 6.0 database update and dynamic multi-table switch

【功能提示】 (1) 能实现邮件接收功能、发送功能，以及对用户账号和邮件的管理功能。 (2) 实现用户地址薄的管理功能。（本功能可视进度酌减

Theory: NDFA: It is a mathematical model containing 5 tuples a) Q- finite non empty set elements of which are called as state. b) T- set of alphabets. c) δ- is a mapping function Q*{T {λ}}*2Q d) S-start state i.e. S ε Q e) F- F (su