ShortString: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: ShortString
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| 1 | + | **Memory requirement:** 256 bytes (1 byte for the length specification and 255 bytes for the characters). | |
| 2 | + | ||
| 3 | + | **Property:** The [[Data field|data field]] of the [[Data type|data type]] Shortstring is an array, made up of data fields of the data type [[Char]]. Its length is defined as: `ShortString = String[255];` | |
| 4 | + | ||
| 5 | + | ShortString has the same properties as the string in Turbo Pascal. | |
| 6 | + | ||
| 7 | + | Definition of a data field of the data type ShortString: | |
| 8 | + | ||
| 9 | + | ``` pascal | |
| 10 | + | var | |
| 11 | + | s : ShortString; | |
| 12 | + | ``` | |
| 13 | + | ||
| 14 | + | Examples for the valid assignment values: | |
| 15 | + | ||
| 16 | + | ``` pascal | |
| 17 | + | s := '0123ABCabc456'; | |
| 18 | + | s := s + '! "§ $% & / () =?'; | |
| 19 | + | s := 'c'; | |
| 20 | + | s := s + IntToStr (45); | |
| 21 | + | ``` | |
| 22 | + | ||
| 23 | + | Examples of invalid assignment of values: | |
| 24 | + | ||
| 25 | + | ``` pascal | |
| 26 | + | s := True; | |
| 27 | + | s := 4; | |
| 28 | + | ``` | |
| 29 | + | ||
| 30 | + | ## Caveats | |
| 31 | + | ||
| 32 | + | > **Warning:** `low(myShortString)` returns `0`, i. e. the index of the length Byte, not the first character’s index. Likewise, `high(myShortString)` always returns `255`. Use `length` instead. | |
| 33 | + | ||
| 34 | + | Nevertheless, a [[for-in loop|for … in loop]] will work as expected. | |
| 35 | + | ||
| 36 | + | ## See also | |
| 37 | + | ||
| 38 | + | - [[Data type|Data types]] | |
| 39 | + | - [[Character and string types]] | |
| 40 | + | ||
| 41 | + | --- | |
| 42 | + | *From the Free Pascal wiki, page "ShortString", as it stood on 2023-12-22 after a change by Alextpp, 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).* | |
| 43 | + | Category: Data types | |
| 44 | + | Category: FPC | |
| 45 | + | Category: RTL |