Basic Pascal Tutorial/Chapter 5/Subranges: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: Basic Pascal Tutorial/Chapter 5/Subranges
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| 1 | + | 5B - Subranges (author: Tao Yue, state: unchanged) | |
| 2 | + | ||
| 3 | + | A *subrange* type is defined in terms of another ordinal data type. The type specification is: | |
| 4 | + | ||
| 5 | + | ``` pascal | |
| 6 | + | lowest_value .. highest_value | |
| 7 | + | ``` | |
| 8 | + | ||
| 9 | + | where `lowest_value < highest_value` and the two values are both in the range of another ordinal data type. | |
| 10 | + | ||
| 11 | + | For example, you may want to declare the days of the week as well as the work week: | |
| 12 | + | ||
| 13 | + | ``` pascal | |
| 14 | + | type | |
| 15 | + | DaysOfWeek = (Sunday, Monday, Tuesday, Wednesday, | |
| 16 | + | Thursday, Friday, Saturday); | |
| 17 | + | DaysOfWorkWeek = Monday..Friday; | |
| 18 | + | ``` | |
| 19 | + | ||
| 20 | + | You can also use subranges for built-in ordinal types such as `char` and `integer`. | |
| 21 | + | ||
| 22 | + | --- | |
| 23 | + | *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](/wiki-contact).* |