字符类型都默认空字符串，数值型都默认0，日期型默认为系统日期。

Character type is acquiescent empty string, numerical value acquiescent 0, date acquiesce is systematic date.

youdao

介绍一种通过拨快日历，简单、有效地防止日期型计算机病毒的软件方法。

A software method of preventing the destroy from date-type virus is introduced.

youdao

介绍一种通过拨快日历，简单、有效地防止日期型计算机病毒的软件方法。

A software method of preventing the destroy from date-type virus is introduced.

youdao