Basic Pascal Tutorial/Chapter 5/Subranges

5B - Subranges (author: Tao Yue, state: unchanged)

A subrange type is defined in terms of another ordinal data type. The type specification is:

lowest_value .. highest_value

where lowest_value < highest_value and the two values are both in the range of another ordinal data type.

For example, you may want to declare the days of the week as well as the work week:

type
  DaysOfWeek = (Sunday, Monday, Tuesday, Wednesday,
                Thursday, Friday, Saturday);
  DaysOfWorkWeek = Monday..Friday;

You can also use subranges for built-in ordinal types such as char and integer.

From the Free Pascal wiki, page "Basic Pascal Tutorial/Chapter 5/Subranges", as it stood on 2022-08-20 after a change by Kai Burghardt, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.