Block: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: Block
| Old | New | Line | |
|---|---|---|---|
| 1 | + | A **block** is a sequence of [[Declaration|declarations]] followed by a sequence of [[statement|statements]]. The declarations are optional. The sequence of statements can be empty, but at least the [[Begin|begin]]…[[End|end]]-[[Frame|frame]] has to be present (in [[Routine|routines]] [[Asm|asm]]…`end` is allowed, too). The key feature of a block is, that declarations are only valid while the statements are processed. This concept is known as [[Scope|scope]]. | |
| 2 | + | ||
| 3 | + | ## Example | |
| 4 | + | ||
| 5 | + | The following is a valid block: | |
| 6 | + | ||
| 7 | + | ``` pascal | |
| 8 | + | const | |
| 9 | + | foobar = -1; | |
| 10 | + | type | |
| 11 | + | booleanArray = array of boolean; | |
| 12 | + | var | |
| 13 | + | check: booleanArray; | |
| 14 | + | begin | |
| 15 | + | check := booleanArray.create(true, false, true); | |
| 16 | + | end; | |
| 17 | + | ``` | |
| 18 | + | ||
| 19 | + | An indication, whether something constitutes a block, is, whether you can use it as part of a routine definition, as well as make a [[Program|program]] out of it (syntactically; apart from the terminating dot). | |
| 20 | + | ||
| 21 | + | ## See also | |
| 22 | + | ||
| 23 | + | - [[Comments|block comments]] | |
| 24 | + | ||
| 25 | + | --- | |
| 26 | + | *From the Free Pascal wiki, page "Block", as it stood on 2021-02-06 after a change by Trev, 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).* | |
| 27 | + | Category: Code | |
| 28 | + | Category: Pascal |