The remaining four digits are a sequential production number.
剩下的四个数字是一个序列的生产数量。
Field widths for specific data types, such as four digits for a year.
特定数据类型的字段宽度，比如用四位数字表示年份。
Permissions set in this way use up to four octal digits.
按这种方法设置的权限使用高达4位八进制数字。
How many four-digit positive integers have their product of digits even?
数字之积为偶数的四位正整数共有多少个？
How many four-digit positive integers have their product of digits even?
数字之积为偶数的四位正整数共有多少个？
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