Page: what changed
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Title: Page
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| 1 | + | The [[Standard Pascal|standard]] [[Procedure|procedure]] **`page`** advances the output of a given textfile by one page. *Page* could refer to a piece of paper if the destination is a physical printer, or could imply blanking the entire screen, the specific behavior is implementation-defined. | |
| 2 | + | ||
| 3 | + | ## signature | |
| 4 | + | ||
| 5 | + | `Page` takes *one* [[Text|text file]] as a parameter. It determines the destination. If the destination is [[Output|output]], it can be omitted. `page;` is short for `page(output);`. | |
| 6 | + | ||
| 7 | + | ## behavior | |
| 8 | + | ||
| 9 | + | Provided the destination is open for writing: | |
| 10 | + | ||
| 11 | + | 1. If not at the *beginning* of a line, do a [[writeln|writeLn(destination)]]. | |
| 12 | + | 2. Implementation-defined method of advancing to the next “page”. | |
| 13 | + | ||
| 14 | + | ## implementation | |
| 15 | + | ||
| 16 | + | - On IBM mainframes, advancing to the next page was achieved by putting a `1`, that is the character of the digit 1, in the first column of a line. | |
| 17 | + | - On most machines using [[ASCII]] though, it simply means emitting a form feed character, i. e. [[Chr|chr(12)]]. The [[FPC]] and the [[GNU Pascal]] Compiler use this method. | |
| 18 | + | ||
| 19 | + | ## notes | |
| 20 | + | ||
| 21 | + | - In the FPC `page` is only available in [[Mode iso|{$mode ISO}]] and [[Mode extendedpascal|{$mode extendedPascal}]]. | |
| 22 | + | - `Page` is a regular [[Identifier|identifier]] and as such can be redefined. | |
| 23 | + | ||
| 24 | + | --- | |
| 25 | + | *From the Free Pascal wiki, page "Page", as it stood on 2022-01-24 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).* | |
| 26 | + | Category: File Handling | |
| 27 | + | Category: Pascal |